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2019 Vol. 6, No. 1
Published: 2019-02-20
1
Progresses and discoveries of geological survey on oil and gas resources related to the Upper Paleozoic in the western slope of Songliao Basin
CHEN Shuwang, ZHANG Jian, ZHENG Yuejuan, SU Fei, ZHANG Haihua, ZHANG Dejun, SUN Lei
DOI: 10.19388/j.zgdzdc.2019.01.01
Based on the data of gravity-magnetic-electric-seismic geophysical survey and geological drilling results of geological survey wells in recent years, the geological conditions and geophysical properties of the target strata, overlying strata and its basement of the Upper Paleozoic are analyzed in the western slope of Songliao Basin. Characteristics of occurrence, rock assemblage and strata chronology of shale and mudstone related to the Permian under different types of T5 boundary of the study area are described. On the evaluation of TOC,
T
max
, hydrocarbon generation potential and well logging data, Fuyu and Baoshan strict is realized to be the potential area of the target strata. The authors also discussed Triassic strata and its geological significance. The methods, which is focus on the difficulties and challenges about deep strata survey, is discussed on the respect of stratigraphy research, geophysical investigation, and the analysis of construction, deformation and reservation about the western slope with complexed structure and magma activities. Considering about the discovery of the heavy oil and helium, the idea of comprehensive survey on the total Basin, Huge geology, multi energy are suggested on the new era of commonweal oil and gas geological survey.
2019 Vol. 6 (1): 1-9 [
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] (
384
)
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10
Comprehensive evaluation of geothermal resources and generating potential of fissure karstic geothermal reserovir at Gudao buried hill uplift area in Shandong Province
ZHAO Jichu, KANG Fengxin
DOI: 10.19388/j.zgdzdc.2019.01.02
Gudao buried hill is a drape anticline with Palaeozoic as its basement, and massive Cambrian - Ordovician carbonate rocks are developed, having the potential of forming fissure karstic geothermal reservoir. In order to evaluate the utilization prospects of the geothermal reservoir and the generating potential,based on the analysis of the geologic background, the authors verified that the Cambrian - Ordovician stratigraphy is predominant by carbonate, taking borehole Gg2 as an example. Badou Formation, Wuyangshan Formation, Beianzhuang Formation of Ordovician, Sanshanzi Formation of Cambrian-Ordovician, and the Zhangxia Formation of Cambrian are mainly composed of limestone and dolomite, which are favorable to develop a fissure karstic geothermal reservoir. The gross thickness of the geothermal reservoir is 480 m. Designating the temperature at the middle point of the reservoir as the average reservoir temperature, aiming at binary geothermal power station as its utilization purpose, and setting the lower temperature limit as 70 ℃, the authors calculated out that geothermal resource contained in the fissure karstic geothermal reservoir is 804×10
16
J at Gudao buried hill. By setting the service lifetime of 30 years, and thermal efficiency of 7%, the generating potential at Gudao buried hill was estimated to be 595 MW, which was classified as a large geothermal field.
2019 Vol. 6 (1): 10-16 [
Abstract
] (
440
)
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17
Shale gas geological characteristics and accumulation model of Longmaxi Formation in Baojing area of Hunan Province
LI Bin, ZHANG Yueheng, CUI Chunlan, LUO Qun, HU Bowen, ZHANG Lei
DOI: 10.19388/j.zgdzdc.2019.01.03
Baojing area of Hunan Province is a new shale gas exploration block, and the geological characteristics and accumulation rule of shale gas are still worthy to be studied. The geological characteristics of Longmaxi Formation shale gas in the study area were summarized in sedimentology, porosity and permeability of the reservoir, geochemistry, gas content and other reservoir characters. According to the study of hydrocarbon generation history, fracture characteristics, detachment layer movement, and fault effect, shale gas accumulation mode was explored. The results show that Longmaxi Formation shale gas in Baojing area of Hunan Province has high organic matter abundance, moderate thermal maturity, high brittle mineral content, and good physical properties, which means this reservoir has shale gas enrichment conditions. The shale experienced the stage of gas generation from Permian to Middle Jurassic. At the end of Middle Jurassic, trough-like folds in a fold-and-thrust belt were formed and the multiple reticular cracks and bedding decollement layer in vertical dimension were formed in Longmaxi Formation reservoir. Therefore, the accumulation model of shale gas in Longmaxi Formation in Baojing area of Hunan Province can be briefly summarized as follows: migration in detachment layer, fracture accumulation, residual in pores, plugging by the fault, enrichment in higher areas and accumulation in box shape.
2019 Vol. 6 (1): 17-25 [
Abstract
] (
427
)
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26
Petroleum geological characteristics and exploration potential of Kerio Basin in East African Rift System
HU Bin, JIA Shen, QIU Chunguang, CHEN Jingtan, RAO Su
DOI: 10.19388/j.zgdzdc.2019.01.04
Since the oil and gas exploration breakthrough has been made in South Lokichar Basin of eastern East African Rift System (EARS) in 2012, the EARS has become a hot spot for research and exploration. However, there were barely good exploration results in peripheral basins, which is worthy to be analyzed deeply. Kerio Basin is adjacent to South Lokichar Basin with lower exploration degree, and there were few domestic researches and achievements in this area. Based on the latest seismic and geological integrated achievements, the petroleum geological characteristics and exploration potential of the basin were expounded. The results show that Kerio Basin is an active rift and half graben with steep slope in the west and gentle slope in the east. Five sedimentary sequences in the basin from Oligocene were developed and the maximum thickness of total deposit is about 6 500 meters. A good source rock was confirmed, but the thickness is about 20 meters. Fluvial and deltaic sandstones with good porosity and permeability were also developed in the basin. The basin can be divided into four sags and five structure zones. The central gentle slope zone and the eastern structural inversion zone are the favorable zones for oil and gas prospecting with two possible hydrocarbon accumulation models. The basin is confirmed to have certain exploration potential, while source rock is the main geological risk in the exploration.
2019 Vol. 6 (1): 26-33 [
Abstract
] (
454
)
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34
Geochemical characteristics and metallogenic geological conditions of pegmatite type lithium polymetallic ore in Rongxuka, Sichuan Province
XU Yunfeng, QIN Yulong, WANG Xianfeng, LI Mingze, ZHOU Xiong, ZHAN Hanyu, WU Wenhui
DOI: 10.19388/j.zgdzdc.2019.01.05
Through the analysis on the geochemical characteristics of the intermediate acid-acid intrusive rocks and pegmatites in the pegmatite type lithium polymetallic ore deposit in Rongxuka of Sichuan Province, the authors discussed the metallogenic geological conditions of stratigraphy, tectonics and magmatites. The results show that the intermediate acid-acid intrusive rocks in Rongxuka area are calc-alkaline and quasi-aluminum rocks, and belong to the I-type granite series. The pegmatites are calc-alkaline and strongly peraluminous rocks, and there are significant geochemical differences in rare earth and trace elements between the intermediate acid-acid intrusive rocks and pegmatites. The intermediate acid-acid intrusive rocks were formed in post-collision tectonic setting, which might be related to the collisional orogeny of the Songpan-Ganzi orogenic belt. The material source might be partial melting of crustal material mixed with a small amount of mantle composition. Pegmatites and intermediate acid-acid intrusive rocks may be products of differentiation and evolution of homogenous magma. The folds, faults and domes formed by the regional napping provided a favorable space for the filling of ore-bearing hydrothermal fluids and enrichment of ore-forming elements. The melts enriched by volatile and rare metals intruded into wall rocks, and the low-permeability mudstones limited the loss of heat and materials favorable for ore accumulation. Then the ore-containing melts solidified and the rare metal pegmatite veins formed.
2019 Vol. 6 (1): 34-40 [
Abstract
] (
485
)
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41
Geochemical characteristics and LA-ICP-MS zircon U-Pb age of the gabbro in Xiaoheishan of Beishan area, Inner Mongolia
LIU Qiang, ZHAO Zhixiong, JIA Yuanqin, XU Hai, WANG Xinliang, GAO Jian
DOI: 10.19388/j.zgdzdc.2019.01.06
Research on Devonian magmatism has important significance for the structural evolution of early Late Paleozoic in Beishan area of Inner Mongolia. LA-ICP-MS zircon U-Pb dating results show that the emplacement age of the Xiaoheishan gabbro is (404.9±1.6) Ma, which is Early Devonian. Petrological and geochemical analysis shows that the gabbro belongs to cal-alkaline igneous rock, and is characterized by the shortage of SiO
2
, K, P, enrichment of Al and Ca, and high Mg
#
value. The total amount of rare-earth elements (REE) is low, and that of light rare-earth elements (LREE) is enriched. Fractional distillation is obvious between LREE and HREE with positive Eu anomalies (
δ
Eu=1.70~1.71). The large ion lithophile elements (Ba, Sr, K) and the strong incompatible element(U) are enriched in the gabbro, while the high field strength elements (Nb, Ta, Ti) are relatively depleted. Combined with the regional geology and geochemical characteristics, the authors conclude that the tectonic setting is volcanic arc, and that the lava is polluted by the earth crust during the upward process, which means the Devonian period in this area is still in orogeny period.
2019 Vol. 6 (1): 41-47 [
Abstract
] (
435
)
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48
Interpretation of concealed rock mass based on anomaly separation of magnetic source from different depth fields
NIU Baotong
DOI: 10.19388/j.zgdzdc.2019.01.07
In order to verify the occurrence status of concealed rock mass in Yinjiahui area of Anhui Province, and delineate the range of intrusive intermediate acid-acid rock mass and advantageous ore-bearing location, the author has polarized and continued the magnetic anomalies, and processed the anomaly separation of magnetic source from different depth fields and vertical derivative. The author has also extracted some useful information about residual magnetic anomalies and the first vertical derivative of magnetic anomalies. Combined with the magnetic anomalies characteristics based on geology data, the results show that the NE residual magnetic anomaly zone formed from the intruded vein along the fault and the NE fault is the main rock-control and ore-control structure. The author also concluded that magnetic geologicalbody, resulting in local residual magnetic anomalies, is concealed and semi-concealed intermediate acid-acid rock mass. This research would provide some reference for the division of geological survey and prospective metallogenic zones, and the outlining of prospecting targets in Anqing-Xuyi geological and mineral resources survey in middle and lower Yangtze metallogenic belt.
2019 Vol. 6 (1): 48-53 [
Abstract
] (
310
)
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54
LA-ICP-MS zircon U-Pb age of the syengranite in Ulanhot region of Inner Mongolia, and its geological significance
QIU Jinxiong, YANG Liang, CHEN Mengchao, WANG Wenyi, GAO Yong
DOI: 10.19388/j.zgdzdc.2019.01.08
In order to investigate the formation age and tectonic background of the syengranite in Ulanhot region, the authors have studied its zircon U-Pb age and geochemical characteristics. The results show that LA-ICP-MS zircon U-Pb age is (219.7±1.2)Ma, which represents its formation age. The syengranite is rich in silicon and alkali, while the content of aluminum, calcium, magnesium and iron is low. These rocks also have high rare-earth elements content, inapparent fractional distillation between light rare-earth elements and heavy rare-earth elements, and obvious negative abnormal Eu. For the trace elements, these rocks are rich in large ion lithophile elements (Rb and K) and high field strength elements( U, Th, Hf and HREE), while they are poor in Sr, Eu, Ba and Ti. The 10 000×Ga/Al value (3.53 ~ 5.09) is higher than the lower limit value (2.6) of A-type granite, and significantly higher than the average value of the I-type and S-type granites (2.10 and 2.28, respectively). Therefore, the authors concluded that Triassic syenogranite is A-type granite, and the formation environment belongs to post-orogenic lithospheric extension tectonic setting after the closure of Paleo-Asian Ocean.
2019 Vol. 6 (1): 54-60 [
Abstract
] (
372
)
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61
Discovery of gigantic sauropod femur fossils and the burial environment in Xinrong area, Shanxi Province
DONG Liyang, XUE Peilin, ZHANG Cai, LIU Yingchao, LI Yu
DOI: 10.19388/j.zgdzdc.2019.01.09
Recently the gigantic sauropod femur fossils have been first discovered in Zhumapu Formation of Upper Cretaceous in Xinrong area of Shanxi Province. Through the observation of preservation occurrence, remaining length and proximal end of the femur, the authors estimated the real length of the femur and the body length of this sauropod. It turns out that the real length of this femur is probably 1.9 m and the body length of the sauropod may reach more than 30.0 m. Furthermore, based on the analysis of sedimentary facies and paleocurrent directions, the authors discussed the burial environment of the femur fossils. The results show that Zhumapu Formation belongs to the meandering river deposit with grand scale, high degree of curvature and strong hydrodynamic force. This sauropod has been buried in the meandering river after a short-medium distance transportation. Discovery of the gigantic sauropod in this area has not only expanded the distribution range of gigantic sauropods in Late Cretaceous in North China , but also is of great significance to Cretaceous paleoclimate and paleoenvironment research in Zuoyun-Xinrong areas.
2019 Vol. 6 (1): 61-66 [
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389
)
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67
Major achievements of land subsidence caused by deep foundation pits dewatering in coastal areas and their applications: A case study of Shanghai
YAN Xuexin, WANG Hanmei, YANG Tianliang, HUANG Xinlei, ZHAN Guanghui, HE Ye
DOI: 10.19388/j.zgdzdc.2019.01.10
With the rapid expansion of urban construction, especially the increasing of scale, density and depth of exploitation of underground space, uneven subsidence has occurred in Shanghai, a typical thick Quaternary covering area in coastal areas. Taking Shanghai as an example, the authors have studied the characteristics, mechanisms, and control strategies of land subsidence induced by deep foundation pits dewatering, and summarized the major achievements in recent years. The partition method has been proposed to prevent land subsidence caused by deep foundation pits dewatering. The way of test design, based on in-situ experiments, has been explored to prevent land subsidence induced by deep foundation pits dewatering. The laws of land subsidence caused by deep foundation pits dewatering have been summarized in shallow confined aquifer of Shanghai. Besides, the dual-control model, including the dewatering and groundwater, and the control indexes were proposed. Some preventive measures have been summarized and the control system has been established. The results have been applied in safety management, major municipal engineering construction and operation in major cities, which could provide some reference for other similar areas.
2019 Vol. 6 (1): 67-74 [
Abstract
] (
392
)
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75
Using sulfur and oxygen isotope to trace the source of sulphate in Baotuquan spring area of Jinan
ZHANG Hailin, WANG Zhong, PANG Wei, TENG Yue, QI Huan
DOI: 10.19388/j.zgdzdc.2019.01.11
In recent years, sulphate concentration of karst water in Jinan is increasing. In order to effectively prevent sulphate pollution and guarantee the safety of drinking water, it is very important to identify the source of sulphate pollution. Based on the systematic analysis of hydrogeological conditions in the study area, the authors identified the major sulphate pollution sources in Baotuquan spring area of Jinan by using sulfur and oxygen isotope technology according to the actual sampling data. The contribution rates of sulphate pollution sources were estimated by IsoSource mass conservation model. The results show that the major sulphate pollution sources were atmospheric sedimentation, sewage and soil. Among them, the contribution rate of atmospheric sedimentation source is the largest, with an average value of 53.9%, followed by sewage source, with an average value of 31%, and the contribution rate of soil source is the smallest, with an average value of 15.1%. This study provides a new method for the quantitative study of sulphate sources of groundwater in northern karst areas, and provides a scientific basis for the prevention and control of sulphate pollution in Baotuquan spring area of Jinan.
2019 Vol. 6 (1): 75-80 [
Abstract
] (
426
)
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81
Quantitative tracer test and analysis of the underground river system in Hebao of Hezhou City
HE Shuorong, XIN Weidong, KANG Zhiqiang, BEI Weichang
DOI: 10.19388/j.zgdzdc.2019.01.12
Tracer test is an effective and widely used technical method in karst hydrogeology survey. In order to determine the karst aquifer structure, the authors made the tracer test on the main conduit of Hebao underground river in Hezhou of Guangxi, used high-precision online monitoring technology. Fluorescein sodium is used as tracer, and the GGUN-FL30 field fluorescence spectrophotometer is used as online monitoring equipment. The test results show that the underground river between the Entrance (S
1
) and the Exit (S
4
) is denoted by pipeline flow, and the structure is simple without any other underground water bodies such as a karst lake. The tracer recovery rate is only 63.18 %, indicating that the underground river has other discharge pathways (maybe subsurface flow). Based on Qtracer2 data analysis, the maximum flow velocity of Hebao underground river in dry season is 156.00 m/h and the average flow velocity is 48.09 m/h. Water storage of karst conduit is 26 714 m
3
. The conduit cross-sectional area is 13.70 m
2
and the tube diameter is 4.18 m. The conduit system is charactered by dispersion coefficient of 0.505 m
2
/s, longitudinal dispersion of 37.81 m, friction factor of 0.178, Reynolds number of 48 937, Sherwood number of 1 875.4 and Schmidt number of 1 140. It is shown that karst is well developed and nonuniformity of aquifer is strong in Hebao underground river. So the underground river system is an single conduit system. The groundwater flow is a turbulent flow, which has being bearing pressure in part. The research data and achievements can provide some reference to the numerical model construction of the underground river system.
2019 Vol. 6 (1): 81-85 [
Abstract
] (
409
)
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86
Compilation method of 1:50 000 comprehensive engineering geological map
LIU Changli, ZHANG Yun, ZHANG Jianyu, LI Hongzhao, LIU Chao
DOI: 10.19388/j.zgdzdc.2019.01.13
The 1:50 000 comprehensive engineering geological map is the foundation of the planning and construction of new urbanization. However, there is no unified technical standard for the compilation of the 1:50 000 comprehensive engineering geological map so far, which can’t meet the needs of engineering geological mapping. By summarizing the domestic and foreign theories and methods of engineering geological mapping, and combined with the current project “1:50 000 engineering geological survey and mapping of northern urban planning areas of the urban agglomeration in Central Plains ”, the authors have compiled a 1:50 000 comprehensive engineering geological map, taking Jiaozuo City as an example. Furthermore, the theories and methods of compiling the 1:50 000 comprehensive engineering geological map have been discussed, and new opinions and ideas on the purpose, subject expression, engineering geological zoning, division of engineering geological layers and layout of the engineering geological map have been put forward. The expressed subject of 1:50 000 comprehensive engineering geological map is the comprehensive characteristics of engineering geology, and the engineering geological zoning is the concrete expression of the subject. According to the macroscopic engineering geological conditions, the engineering geological zoning can be carried out based on the difference of the topography, stratum lithology (engineering geological layer), geotechnical structure or deformation strength, crustal stability or active faults (earthquakes), and adverse geological phenomena or geological disasters. The engineering geological layer should be taken as the basic mapping unit, and the division of the engineering geological layer can be carried out according to the “GB/T 50218-2014 Standard for Classification of Engineering Rock Mass”. In addition, the engineering geological features should be reflected as much as possible, including (but not limited to) each engineering geological borehole histogram, hydrogeological elements, internal and external dynamic geological phenomena, major engineering geological problems and so on. The comprehensive engineering geological map should be composed of the main body plan, inlay map, section map, comprehensive borehole histogram, engineering geological feature description table and legend, all of which should be scientifically and reasonably configured.
2019 Vol. 6 (1): 86-93 [
Abstract
] (
591
)
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