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2024 Vol. 11, No. 5 Published: 2024-10-20

	1	Oil and gas exploration breakthroughs and insights in the western segment of Silurian Shajingzi structural belt in Tarim Basin
		GAO Yongjin,ZHANG Yuanyin,WU Chao,YANG Youxing,BAI Zhongkai,TIAN Ya
		DOI: 10.19388/j.zgdzdc.2024.286
		The exploration degree of Silurian oil and gas in the northwestern part of Tarim Basin was relatively low. The oil and gas discovery was obtained in the eastern segment of Shajingzi structural belt from wells XSD 1 and XSC 1 from 2019 to 2021, and then the industrial gas flow was also achieved in XSD 2 well, which extended westward in 2023. Based on the analysis of drilling, oil testing, geochemical, geological characteristics in Shajingzi area and the results of field profile measurements, and combined with the targeted processing and detailed interpretation of 2D seismic data, the authors in this paper conducted an analysis of the reservoir formation model and evaluation of resource potential. The results are as follows. ① Large sand bodies were developed in Silurian Kepingtage Formation in Shajingzi structural belt, with favorable reservoir-seal assemblages. The wells XSD 2 in the eastern segment, XSC 1 and XSD 1 in the western segment, have all achieved industrial gas flow, revealing the oil and gas potential of Silurian strata; ② Shajingzi fault system is large in scale and long in duration, connecting the high-quality source rocks in the deep part of Awati depression. This fault system also controls the formation of a series of structural traps and structural-lithology traps in Shajingzi structural belt. The reservoir formation period is mainly Himalayan period after the traps were formed, characterized by “fault-dominated, late-stage reservoir formation”; ③ Forty-two traps have been identified in Silurian Kepingtage Formation of Shajingzi structural belt, with a predicted trap resource volume of 198.21 million tons oil equivalent, indicating significant oil and gas exploration potential. The results of the study could provide some references and basis for the next step in the evaluation of the exploration area.
		2024 Vol. 11 (5): 1-8 [Abstract] ( 9 ) RICH HTML PDF (17857 KB) ( 54 )

	9	Occurrence states and transformation of natural hydrogen mechanism
		LI Qiang,MENG Qingqiang,HAN Chao,ZHOU Yuan,WU Han,DAI Shourui
		DOI: 10.19388/j.zgdzdc.2024.329
		As a clean energy source, hydrogen is widely regarded as an effective strategy for replacing fossil fuels and mitigating environmental issues. Based on the domestic and international research on the occurrence state and phase of hydrogen, and combined with the variations in temperature and pressure under geological conditions, the authors concluded the following insights. ① Natural hydrogen is found in free, dissolved, and adsorbed states in earth's shallow layers and in metal hydrides state in earth's deeper layers. The transformation among these states constitutes a pivotal factor influencing the availability of hydrogen resources. ② In geological settings, natural hydrogen predominantly exists in a supercritical state, and it only transitions to a gaseous form near the surface. Further research is warranted to investigate its characteristics. ③ The potential for natural hydrogen development remains largely unrealized. Future research should focus on the accumulation patterns, migration mechanisms, and preservation conditions of hydrogen to thoroughly explore its development potential. Additionally, the transformation processes between different states provides a novel perspective on understanding the earth's hydrogen cycle. The study on the occurrence state and transformation processes of natural hydrogen could provide theory basis for the accumulation patterns of natural hydrogen, and references for further development and exploitation of natural hydrogen.
		2024 Vol. 11 (5): 9-12 [Abstract] ( 8 ) RICH HTML PDF (9084 KB) ( 70 )

	21	Geological characteristics and prospecting potential of Xinlong gold deposit in the central section of Middle Lhasa block of Tibet
		DI Mengxiang,CHEN Wei,ZHAI Degao,LIU Qingping,YU Jiajia,WANG Yankai,LUO Long,WU Wenxian,BAI Chao
		DOI: 10.19388/j.zgdzdc.2024.300
		Xinlong gold deposit in Middle Lhasa block of Tibet has great prospecting potential. Through mineral geological survey and preliminary drilling verification, three ore bodies were delineated, which are controlled by the NNW and NNW fault structures. These three ore bodies exist in rhyolitic breccia lava, and the Au-II gold belt are 300~1 000 m long and up to 10 m thick, with single engineering grade of 17.97g/t. It is predicted that the ore body of Xinlong gold deposit can reach large scale, and the whole mining area is expected to reach super large scale. The output of gold is divided into two types, that is galena + arsenonickel + gold combination and pyrite+ quartz + gold combination. The alteration in the mining area is mainly dominated by silicification and medium to high grade argillation. According to the characteristics of mineralization and alteration, it is considered that Xinlong gold deposit is a high sulfide epigenetic type gold deposit, which is the first gold deposit of this type in continental volcanic rocks in Tibet. According to the comprehensive geological analysis, there is a complete porphyry-epithermal type Cu-Au metallogenic system in Xinlong-Langmeila area, which has great prospecting potential. The discovery of Xinlong gold deposit could open up a new direction for the exploration in the northern Tibet gold deposit.
		2024 Vol. 11 (5): 21-28 [Abstract] ( 10 ) RICH HTML PDF (15328 KB) ( 63 )

	29	Discovery and prospecting significance of the gold deposit in the western margin of Dayangshu volcanic basin in Greater Khingan Mountains
		LIU Baoshan,WANG Zeyu,KOU Linlin,YANG Yuanjiang,YANG Fengchao,LIU Wenyu
		DOI: 10.19388/j.zgdzdc.2024.242
		The Mesozoic volcanic basin of Greater Khingan Mountains is a favorable area for epithermal volcanic hydrothermal gold deposits. Based on previous delineation of 2 gold prospect areas, Zhangdian and Zhaluomei, during 1:50 000 mineral survey carried out in the western margin of Dayangshu volcanic basin, the authors of this paper conducted verification and inspection of geophysical and chemical exploration anomalies through exploratory trench. A stable extended gold-bearing quartz vein was found in Zhangdian mining area, with a length of about 0.95 km, an apparent thickness of 5~15 m, and its highest gold grade of 88.25×10^-6. Two gold ore bodies, one gold mineralized body and one silver ore body, were discovered in Zhaluomei mining area. No.I and No.II gold ore bodies were inferred to be the same gold ore body, with a length more than 600 m, an apparent thickness of 2~3 m, and their highest gold grade of 5.83×10^-6. No.IV silver ore body has an apparent thickness of 4.0 m, and its highest grade is (50.90~310.00)×10^-6. The authors analyzed the characteristics of soil geochemical anomaly and apparent polarization anomaly of the induced polarization ladder measurement in these two mining areas, and compared these conditions with the metallogenic geological conditions of Sandaowanzi and other gold deposits. The gold deposits in Zhangdian and Zhaluomei mining areas were identified to have medium to large metallogenic resource potential. The discovery of gold deposit in the margin of Dayangshu volcanic basin could provide some reference for the exploration and deployment of gold deposits in the volcanic belt of Greater Khingan Mountains, and promote the improvement of the exploration and research, which could further contribute to the prospecting breakthrough.
		2024 Vol. 11 (5): 29-38 [Abstract] ( 14 ) RICH HTML PDF (14207 KB) ( 41 )

	39	Seismic exploration of potassium salt in Dalangtan-Heibei concave of Qaidam Basin and its preliminary results
		LI Guangcai,YONG Fan,WANG Xiaojiang,WANG Kai,WANG Gang,LIU Jianxun,WANG Gang,
		DOI: 10.19388/j.zgdzdc.2024.241
		The potassium salt resources are abundant in Dalangtan-Heibei concave in northwestern Qaidam Basin, but the shallow folds of conventional seismic detection technology are insufficient, affecting the imaging quality. In order to detect the fine structure of potassium brine reservoir in Dalangtan-Heibei concave, the authors carried out high-resolution reflection seismic detection. The high-quality seismic data and preliminary exploration results were obtained in this area, through the acquisition parameter optimization test and effective data processing. ① The acquisition scheme of small trace spacing, long array, high folds, vibroseis excitation with strong energy and broadband is conducive to obtaining high quality original data. ② The linear interference is effectively suppressed through multiple iterative dynamic correction and F-K filtering, and shallow effective waves were preserved to avoid fault illusion. The imaging quality was significantly improved, and the geological structures were effectively deciphered. ③ The seismic data reveal that the top of the deep gravel type halogen reservoir is in angular unconformity contact with the overlying strata, and the two ends of the reservoir are controlled by two faults. The reservoir space is composed of unconformity surface, faults and strong reflection interface at the bottom, which gradually peaks out in a triangular area from south to north, suggesting that the triangular reservoir may be a favorable storage space for gravel type potccssium-containing brine. In this paper, the effective seismic detection technology was used to successfully reveal the underground structural framework, and the characteristics of the formation structure of the potassium brine reservoir were finely deciphered. This work could provide geophysical basis for the exploration of the characteristics of the potassium brine reservoir, and is of significance for the further study of the gravel type potassium-containing brine.
		2024 Vol. 11 (5): 39-45 [Abstract] ( 7 ) RICH HTML PDF (21344 KB) ( 33 )

	46	Geological characteristics and prospecting criteria of Tuanshan Au-Cu deposit in Kongquegou area of South Tianshan in Xinjiang
		ZHANG Xiaoxing,WANG Liang,GAO Yongbao,HUA Lipeng,WANG Zilong,LI Xiaodong,
		DOI: 10.19388/j.zgdzdc.2024.238
		Although the metallogenic geological conditions are superior in South Tianshan area of Xinjiang, the prospecting work has not achieved a great breakthrough. Tuanshan Au-Cu deposit was newly developed with medium potential resources in Kongquegou area of South Tianshan since new breakthroughs in critical mineral exploration were implemented. The geological environment, orebodies distribution, ore characteristics and genetic characteristics of Tuanshan Au-Cu deposit were expounded in detail on the basis of the comprehensive regional metallogenic regularity and the latest progress of ore prospecting. Tuanshan Au-Cu deposit is located in the tectonic superposition area of NWW Kongquegou faults and NE faults in late stage, and the ore-bearing strata is low-grade metamorphism sand in Kongquegou Formation of Upper Silurian. There are 15 mineralization alteration zones, and 13 ore bodies of Au and Au-Cu. The average grade of Au is 0.93 g/t, and the average grade of Cu is 0.66%, with the average thickness of 3.54 m. The genetic type belongs to a mediuin-low temperature hydrothermal gold-copper deposit, and there is a great potential for copper and gold exploration in deep through sorting out regional background, ore-controlling elements, geophysical and geochemical prospecting indicators. The research results expanded a new space for gold exploration in Kongquegou Formation of Upper Silurian and could provide some references for regional mineral exploration.
		2024 Vol. 11 (5): 46-54 [Abstract] ( 7 ) RICH HTML PDF (13119 KB) ( 40 )

	55	Accurate characterization of the alteration zoning in Chihu copper-molybdenum deposit by a new tool GeoAHSI in Hami area of Xinjiang
		LI Shijie,LIU Xiaoyu,QIN Haoyang,HE Haiyang,WANG Siqi,SUN Xu
		DOI: 10.19388/j.zgdzdc.2024.239
		The characteristics of alteration zoning can indicate the hydrothermal alteration activities associated with porphyry deposits, making it the important prospecting indicators for porphyry deposits. Based on fine spectral resolution, the hyperspectral remote sensing data can accurately delineate the spatial distribution of various hydrothermally altered minerals, providing reliable basis for the identification and localization of porphyry deposits. Based on the Teracorder algorithm framework, the authors developed and made open-source of GeoAHSI, a mineral identification tool for domestic hyperspectral remote sensing satellite imagery, to achieve convenient and efficient batch processing and mineral mapping engineering applications of domestic hyperspectral remote sensing satellite imagery. Based on the research basis and field sampling analysis, the GF-5 AHSI (Advanced Hyperspectral Imager) imagery was used as remote sensing data source to carry out surface mineral mapping and verification work in Chihu copper-molybdenum mining area. The results show that AHSI hyperspectral mineral mapping accurately characterized the typical hydrothermal alteration zoning characteristics of porphyry deposits with pyrophyllite+alunite as the advanced argillic alteration core and gradually transitioning outward to kaolinite, pyrophyllite, muscovite and other altered mineral assemblages. Moreover, the mineral map had good spatial distribution consistency with traditional geological mapping units and structures. In addition, the GeoAHSI tool also extracted absorption characterization and wavelength distribution of muscovite in this area, and revealed the relationship between aluminum rich muscovite and porphyry mineralization in Chihu copper molybdenum deposit. The study provides a mature and effective tool and corresponding methods for the identification of alteration zoning for porphyry deposits, which could help promote the domestic hyperspectral remote sensing satellites’ utilities in the new round of mineral exploration breakthroughs.
		2024 Vol. 11 (5): 55-65 [Abstract] ( 6 ) RICH HTML PDF (18257 KB) ( 78 )

	66	Metallogenic geological conditions, geochemical characteristics and new discovery of ore prospecting in Hongliuyuan-Huitongshan area of Beishan in Gansu Province
		XIE Xie,LI Wenming,GAO Yongwei,YANG Jianguo,QI Qi
		DOI: 10.19388/j.zgdzdc.2023.322
		The Hongliuyuan-Huitongshan area is located in the southern Beishan belt of Gansu Province, which is a favorable area for forming copper, nickel, iron, lead zinc, molybdenum, gold and silver deposits with good prospecting potential. By carrying out the analysis of geological conditions of mineralization, and summarizing the key factors controlling mineralization, the authors identified Au, Ag, As, Sb, Hg, W, Sn, Ni and Cu are the main ore-forming (associated) elements in the area, according to the geochemical characteristics of stream sediments. The anomaly of Ni and Cu is related to the distribution of basic-ultrabasic intrusive rocks, while the anomaly of Au is obviously controlled by the middle Warissian-porphyritic granite and the Late Caledonian quartz diorite. Besides, the anomaly of Au is also closely related to the regional faults and secondary faults that are parallel or oblique. A number of ore sites and mineralization clues were newly discovered in Mingyang copper-nickel mine and Yangfan gold mine through anomalous investigation. Four prospecting areas with great metallogenic potential were optimized based on the analysis of regional metallogenic geological conditions and the characteristics of geophysical and geochemical exploration. Especially, the discovery of Mingyang copper-nickel deposit in Early Paleozoic has achieved a new breakthrough in copper-nickel ore prospecting in Beishan area in recent years. The research results could provide an important basis for further prospecting and deployment.
		2024 Vol. 11 (5): 66-77 [Abstract] ( 14 ) RICH HTML PDF (14200 KB) ( 51 )

	78	Metallogenic characteristics and regularities of Hengyang Basin and its surrounding areas
		LIU Xingzhong,QIN Jinhua,WANG Denghong,FAN Zichun,YANG Xiaofei
		DOI: 10.19388/j.zgdzdc.2024.256
		Hengyang Basin is located at the junction between Jiangxi- Hunan-Guangxi-Guangdong fold belt of South China fold system and Jiangnan platform uplift, with the development of multi-stages and multi-types metallic and non-metallic deposits. The systematic summarization of regional metallogenic regularities is deficient in current research, which hinders the establishment of metallogenic theory and ore prospecting. The authors in this paper summarized and analyzed the characteristics of magmatism and metallogenesis, temporal and spatial distribution of Hengyang Basin. The results show that multi-stage magmatism and mineralization were developed since Paleozoic, mainly in Indosinian and Yanshanian Period. Most of the main metal deposits in the basin are closely related to magmatism, and the mineralization types developed from high temperature to low temperature exist. The spatial distribution of rock mass and deposits in the basin is closely related with the deep-seated fractures, and various types of vertical zoning are developed in each deposit. Three different types of mineralized assemblage zones are developed in the basin from northwest to southeast, with mineralization temperature rising gradually. The Hengyang type basin and range structural belt are mainly controlled by the effect of lower mantle plume activities under the tectonic setting of multi-stage lithospheric extension in South China. The diagenesis and metallogenic activities are triggered by the superposition of multiple process, including partial melting and fractional crystallization in different locations of the lithosphere, upwelling of deep fertile ore fluid and the extraction of metals from surrounding rocks. The research results could provide some references for the study of metallogenic regularity and further prospecting in Meso-Cenozoic basins in South China.
		2024 Vol. 11 (5): 78-91 [Abstract] ( 12 ) RICH HTML PDF (9002 KB) ( 9 )

	92	Sedimentary characteristics of Doushantuo Formation in middle-upper Yangtze region and its significance for oil and gas geology
		CHEN Ke,LU Yanxin,LI Fei,SONG Teng
		DOI: 10.19388/j.zgdzdc.2024.271
		Industrial gas flow of shale gas was recently achieved in Doushantuo Formation of Sinian in the western Hubei Province. The organic-rich shale of Doushantuo Formation was predominantly found in Deyang-Anyue rift of the upper Yangtze region and the western Hubei rift of the middle Yangtze region, and its sedimentary characteristics and petroleum geological conditions were critical for further exploration and development of shale gas and oil resources. A comparative analysis of the sedimentary characteristics and environment of these two rifts was conducted through the analysis of the outcrops, drilling, and geophysical data of Doushantuo Formation. The results are as follows. ① The paleogeographic pattern exhibited a terrain that was higher in the west and lower in the east in the middle-upper Yangtze region during the deposition of Doushantuo Formation. ② A significant area of ancient land persisted in the upper Yangtze region during the early deposition stage of Doushantuo Formation, with a relatively thin layer or missing layer, which has mass deposition in the middle-later stage. While the middle Yangtze region features sedimentary environment such as platform, lagoon, continental shelf, and basin, with well-developed strata, substantial sediment thickness, and development of organic-rich shales. ③ Doushantuo Formation is a product of an extensional environment, and the aulacogen in the middle-upper Yangtze region all formed graben basin with in the platform. The formation of Deyang-Anyue fault depression in the upper Yangtze region occurred late, and Doushantuo Formation primarily deposited in carbonate rock. Conversely, the western Hubei rift of the middle Yangtze region formed earlier, with shale and carbonate intercalations depositing. ④ In the western Hubei Province, Doushantuo Formation depositing in the rift trough contains abundant organic matter. The well-preserved structural units are anticipated to lead to breakthroughs in shale gas exploration, which could potentially serve as the natural gas source rock of Dengying Formation, and present opportunities for conventional oil and gas discoveries within the matching area of source-reservoir-cap conditions. This research could provide some references for the oil and gas investigation work in Sinian-Cambrian rifts.
		2024 Vol. 11 (5): 92-103 [Abstract] ( 13 ) RICH HTML PDF (16200 KB) ( 12 )

	104	Metallogenic series, metallogenic lineage and metallogenic evolution history of gold deposits in Liaodong-Jinan metallogenic belt
		LIU Changchun,XU Guoyu,WANG Longkai,WANG Gang,YAO Zhihong
		DOI: 10.19388/j.zgdzdc.2024.253
		Liaodong-Jinan metallogenic belt is located in the northern part of the eastern Bohai Sea block, and the geological conditions for gold mineralization are superior. On the basis of analyzing the gold resources profile in the metallogenic belt, the authors analyzed the temporal and spatial distribution and geological characteristics of gold deposits formed by different mineralization processes. Then, 3 gold metallogenic series associations, 5 metallogenic series, 10 metallogenic subseries and 18 deposit types were classified. The tectonic units, mineralization periods, and mineralization zones were combined with gold mineralization series to establish the gold mineralization lineage. According to four gold ore-forming periods of Neoarchean, Puleoproterozoic, Mesozoic and Cenozoic, the gold ore-forming evolution history of the southern and eastern Liaoning metallogenic belt was summarized. The identification of genetic type of gold deposits, the classification of metallogenic series, the establishment of metallogenic lineage and the research of evolution history would further enhance the research degree of gold mineralization regularity of Liaodong-Jinan metallogenic belt, and could provided basic data for future study of gold deposits in this metallogenic belt.
		2024 Vol. 11 (5): 104-111 [Abstract] ( 11 ) RICH HTML PDF (3494 KB) ( 24 )

	112	Indicative significance of spectral characteristics of silky fern leaves for moly-bdenum metal exploration in Fanshan copper-molybdenum deposit area
		SHI Chao,LI Shu,WANG Xueping
		DOI: 10.19388/j.zgdzdc.2024.240
		In response to the remote sensing technology problems in mineral exploration in vegetation-covered areas, the authors proposed a new method of geological prospecting using remote sensing, taking advantage of the migration rules of metal elements and the spectral variation caused by metal stress on vegetation. The method is based on the principle of reflectance and absorption characteristics of leaf spectra of ferns, combined with geochemical data, to indirectly achieve remote sensing mapping of heavy metal element distribution. Silky fern samples and the corresponding spectral data were collected from the deposit area and the surrounding background area to determine molybdenum element content in silky fern leaves by chemical analysis. The silky fern leaves were confirmed to be affected by molybdenum elements, and the differences between silky fern leaves in the deposit area and those in the background area in terms of waveform, red edge position, chlorophyll and water absorption, and vegetation index were compared and analyzed. The results show that the fern leaves affected by molybdenum metal stress in the deposit area have obvious differences in spectral curves and absorption characteristics compared with those in the background area, especially at 970 nm water absorption feature. The research results could provide new ideas for the application of remote sensing technology in geological prospecting in vegetation-covered areas.
		2024 Vol. 11 (5): 112-119 [Abstract] ( 8 ) RICH HTML PDF (7108 KB) ( 9 )

	120	Application and enlightenment of the geochemical exploration in Zaozigou gold deposit
		YAN Kang,TANG Yuanhe,GUO Wendi,ZHANG Rui,LI Kangning,XU Yongli
		DOI: 10.19388/j.zgdzdc.2024.206
		Zaozigou gold deposit is located in the northwest of West Qinling orogenic belt, with well-developed vegetation and poor bedrock outcropping. The geochemical exploration is one of the most effective exploration methods in the region. On the basis of systematically combing the geochemical characteristics of 1:200,000 and 1:50,000 water sediment measurements and 1:10,000 soil measurements of Zaozigou gold deposit, the authors found that Au has a positive correlation with Sb, As, Hg, Ag and Cu, combined with the characteristics of the primary halo of the deep borehole SK8314. Especially, the combination of Au and Sb is a direct geochemical marker for gold prospecting. The deep primary halo zoning sequence is Bi-Cu-Mo-Sb-Ag-Au-W-As-Sn-Zn-Cd-Pb-Cr-Ni-Co-Hg, and Bi is located in the leading halo of the zoning sequence. Cu is located in the leading halo of the zoning sequence, and Pb and Zn are located in the tail halo of the zoning sequence, indicating that the ore body has the characteristics of multi-stage metallogenic superposition, probably with blind ore body in the depth. At the same time, the ratios of geochemical parameters (As+Sb)/(Bi+Mo) and 100·Sb/(Bi·Mo) gradually increased with the increasing depth at hole SK8314 below 1 850 m, indicating blind ore bodies in the deeper part and a large prospecting space. The research results could provide some references for deep and peripheral prospecting in Zaozigou.
		2024 Vol. 11 (5): 120-128 [Abstract] ( 9 ) RICH HTML PDF (9579 KB) ( 28 )

	129	Technical progress of processing methods for magnetotelluric sounding data
		ZHANG Kun,LIU Lei,MA Xingzhi,YANG Yufan,
		DOI: 10.19388/j.zgdzdc.2024.119
		The magnetotelluric sounding method is widely used in researches on geodynamics, metallogenic system, deep exploration of mineral resource and clean/oil energy and investigation of geological disaster, due to its advantages of large detection depth, penetrating high resistance layers, portable performance and low cost. However, the performance of this method is weak in natural electromagnetic field signals observation, which is easily interfered by noise. The effective electrical information is obtained by long-term observation and multiple superposition, and the related data processing and analysis methods were used to obtain reliable geo-electrical results. Data processing usually includes time-frequency conversion, denoising, estimation of impedance tensor and tipper vector, and data analysis includes electrical strike direction and medium dimension analysis. In this paper, the authors summarized the widely used processing methods for magnetotelluric sounding data, based on previous research and introduced the forefront research directions and achievements focusing on denoising in data processing and impedance and phase tensor in data analysis. The characteristics and advantages of the existing methods, and the applicability to geomagnetic field observation data under different environments and backgrounds were analyzed to provide theorical information and basic guarantee for effective and efficient application of magnetotelluric sounding.
		2024 Vol. 11 (5): 129-138 [Abstract] ( 10 ) RICH HTML PDF (1591 KB) ( 18 )

	139	3D geological modeling based on joint interpretation of gravity, magnetism, electricity and seismicity: A case study of Nanling-Xuancheng ore district
		GUO Dong,DING Wenxiang,LAN Xueyi,TAO Long,ZHANG Yuanyuan,LU Sanming
		DOI: 10.19388/j.zgdzdc.2024.326
		Nanling-Xuancheng ore district has recently emerged as the eighth significant metallogenic district within the Middle-Lower Yangtze River metallogenic belt. Due to the thick surface cover and relatively insufficient research on the deep geological structure, the complex fault systems and concealed intrusions have not yet been systematically modeled and analyzed in 3D model, which significantly restricts the understanding of metallogenic regularities and the progress of deep mineral exploration. To address this issue, the authors in this paper integrated multi-source geophysical data, including gravity, magnetism, electricity, and seismicity, along with the apriori information of borehole data and rock physical properties. And the implicit 3D geological-geophysical modeling approach was optimized to reveal the deep geological structure and provide effective technical support for deep prospecting. Through joint inversion and comprehensive modeling of multi-source data, this study established a 3D geological model of Nanling-Xuancheng ore district, which delineated the spatial distribution characteristics of fault networks, concealed intrusions, and ore-controlling strata in detail. The incorporation of multiple apriori information constraints and borehole information further improved the model's precision and reliability, significantly enhancing the interpretation ability of deep geological structures and metallogenic systems. The results revealed the spatial distribution regularities of ore-controlling factors and identified potential favorable mineralization zones. The findings suggest that there is a close metallogenic coupling relationship between deep magmatic activity and the primary fault systems in Nanling-Xuancheng ore district, and that several contact zones between the identified concealed intrusions and ore-controlling strata have promising mineralization potential.
		2024 Vol. 11 (5): 139-152 [Abstract] ( 14 ) RICH HTML PDF (24009 KB) ( 143 )

	153	Simulation analysis of thermal-stress coupling for deep hole pressure retention sampling ball valves
		WANG Yingli,LI Xiaoyang,LI Bing,SHI Shanshan,WU Jixiu
		DOI: 10.19388/j.zgdzdc.2024.237
		The temperature and pressure inside the borehole are higher and higher with the increasing depth of the borehole. As a technical method to effectively obtain the in situ state of the underground core, the effective realization of the in situ pressure retention under the high temperature and pressure environment has become one of the key signs to test the reliability of pressure retention sampling. Thus, ball valves were selected as key devices for pressure retention sampling and simulation analysis of thermal-stress coupling, and the stress and deformation law of ball valves in the environmental parameters of [15,30] MPa and [0,250] ℃ were analyzed. The results of numerical simulation are as follows. ① The maximum equivalent stress and deformation values of three materials of 316L, 42CrMo and Inconel718 under the action of static pressure from 15 to 30 MPa were compared, and the 42CrMo was preferred as a material for the fabrication of ball valves, considering the cost of processing. ② The maximum deformation values of ball valves is increasing when the temperature is increasing from 0 ℃ to 250 ℃, but the growth rate is only 1.05%. The maximum equivalent force is increasing with slight fluctuation, showing an increasing overall trend. The maximum fluctuation is 12.76 MPa, which is in the effective sealing range of ball valves. The simulation results could provide theoretical data for the reliable sealing of pressure retention ball valves in the deep hole.
		2024 Vol. 11 (5): 153-160 [Abstract] ( 7 ) RICH HTML PDF (12606 KB) ( 7 )

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