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2016 Vol. 3, No. 6
Published: 2016-12-20
 
1 Progress and orientation of the project about fundamental geological survey on oil and gas resources in the periphery area of Songliao Basin
CHEN Shuwang, GONG Fanhao, YANG Jianguo, ZHANG Jian, LI Yongfei, WANG Dandan, GAO Xiaoyong, LI Xiaohai
In order to get continuous source of oil and gas in Songliao Basin, basic geological survey was carried out in the west, south and east of the periphery of Songliao Basin, focusing on the Jurassic, the Permian-Carboniferous and the Middle Proterozoic. The objective and content of oil and gas geology survey project in the periphery of Songliao basin were explained, and the key problems and their solutions and predictive results were proposed in this paper. The periodical achievements and the future work direction were also summarized.
2016 Vol. 3 (6): 1-9 [Abstract] ( 319 ) RICH HTML PDF (2023 KB)  ( 570 )
10 Application of comprehensive airborne gravity and magnetic investigation in oil and gas resources survey in Junggar Basin
ZHANG Wan, WANG Zhibo, LIU Yinghui, ZHOU Jianxin, ZHOU Daoqing, ZHENG Qifang
China Aero Geophysical Survey and Remote Sensing Center for Land and Resources carried out a comprehensive investigation on airbone gravity and maganetic in the midwest of Junggar Basin for the first time to serve oil and gas resources survey, find out the base structure of Junggar Basin and provide new favorable oil and gas exploration area. With high quality 1:50 000 gravity data of 66 000 km, this study has filled a research gap of high-precision airborne gravity and magnetic exploration in this investigated areas. The features of gravity field and magnetic field have also been investigated in the study areas, providing gravity and magnetic basis for fundamental geology study of oil and gas resources assessment and building a solid foundation for the study of comprehensive gravity and magnetic investigation and the application of integrated geology.
2016 Vol. 3 (6): 10-16 [Abstract] ( 432 ) RICH HTML PDF (1028 KB)  ( 399 )
17 Enrichment rules and sedimentary environment characteristics of associated gallium in bauxite deposit in Dazhuyuan of Wuchuan in Guizhou Province
WU Bo, HAN Zhonghua, WENG Shenfu, CHEN Qiang, TAO Ping
Through the study of Dazhuyuan bauxite deposit, we found that the content of associated gallium in bauxite deposit generally exceeds the minimum index of industrial utilization. Gallium has a different distribution in ore-bearing rock series and was moderately positively correlated with TiO2, Cr, Zr, Sn, meaning that gallium may occur in minerals containing Cr, Zr, Sn. Gallium and Al2O3 has weakly positive correlation, indicating that gallium is possible to isomorphism exists in the form of aluminum. Also the Sr/Ba is 1.09-19.69, more than 1,showing that bauxite ore formed in marine environment. The Th/U is 1.72-12.31,showing the incomplete bauxite weathering. And Ga/Al is 0.45-1.84, showing that the pH of mineralization medium varies lightly, and mineral assemblages in acidic medium can be inferred by containing pyrite, kaolinite and other minerals in the ore-bearing rocks. The evidences that chondrite-normalized curve of rare earth element (REE) tilted to the right, light rare earth element (LREE) shows enrichment, heavy rare earth element (HREE) shows loss, δCe shows weak positive anomalies and Ce/Ce* is 1.17-10.17, indicate that the ore-bearing rock series were formed in an oxygen-rich sedimentary environment. Besides δEu appear as negative anomalies, which further indicates that mineralization is in oxide-based environment. Dazhuyuan bauxite deposit is concluded to be formed in marine oxygen-rich sedimentary environment through comprehensive analysis.
2016 Vol. 3 (6): 17-25 [Abstract] ( 324 ) RICH HTML PDF (1156 KB)  ( 377 )
26 Geothermal occurrence regularity and target area prediction in Weishui Anticlinein, western Guizhou Province
WANG Lei, ZHANG Hai
Weishui Anticline is close to the urban area of Liupanshui City, which has favorable geothermal geological conditions with the formation of low and middle temperature geothermal resources. So it is rich in potential geothermal resources. However, the geological structure conditions are complex. And we have not enough recognition on the corresponding structure, type, burial conditions and spatial distribution of geothermal resources, so the region in the development and utilization of geothermal resources has not yet made a substantive breakthrough. The study of Weishui Anticline geothermal occurrence regularity and target prediction, it is supported by the results of the preliminary exploration work. On the basis of the comprehensive analysis and arrangement of relevant exploration data and by analysis of Weishui Anticline geologic background, heating conditions, thermal reservoir structure, geothermal carrier and its migration and recharge, this paper clearly indicated that this area belongs to the low and middle temperature type controlled by buried depth condition. The heat source mainly comes from the natural temperature formation (i.e. geothermal gradient). The geothermal carrier is mainly based on the ground water, and the type of the thermal reservoir is mainly the type of the thermal reservoir. Combined with existing geothermal engineering construction, the key reasons that the project failed to achieve the expected effect were analysed. It reveals that the heat reservoir layers are the Upper Devonian Raoshuo Formation (D3y) and Wangchengpo Formation (D3w), and the Middle Devonian Dushan Formation(D2d). According to the heat reservoir top boundary depth contour of Weishui Anticline, the authors carried out the target prediction. The theoretical conservative water temperature is 44.7-59.7 ℃, and the stable geothermal water inflow is not less than 500 m3/d, which provides a basis for the further exploration and development of geothermal resources.
2016 Vol. 3 (6): 26-31 [Abstract] ( 337 ) RICH HTML PDF (981 KB)  ( 238 )
32 Significance of Early Cretaceous index fossils from Risong villages of Tibet
CHEN Meitao, FAN Guoqiang, JIA Di, PAN Yingxing, KANG Xiao
The study area is located in Risong villages of Tibet. In order to provide the basis for Mesozoic stratigraphic age in this area, lithology combination, sedimentary environment, paleontological characteristics were studied. A lot of Early Cretaceous index fossils, such as Orbitolina (Palorbitolina)complanata and Stylina parvistella Volz, were found in the Jurassic strata in the 1:250 000 geological survey in Ritu County. These fossils provided strong evidence of the division of stratigraphic age in this area. Combining with analysis of sedimentary environment, the conclusion can be made that sedimentary facies in early Cretaceous of this area developed in residual sea basins.
2016 Vol. 3 (6): 32-36 [Abstract] ( 320 ) RICH HTML PDF (1038 KB)  ( 229 )
37 Nadingco Formation volcano rocks zircon U-Pb age and geochemical characteristics in Gêrzê county area of northern Tibet area
CHU Huili
Volcanic rocks of the Nadingco Formation is mainly distributed in the north of the Bangong lake-Nujiang suture zone.It is belong to the volcano rock formation of the Qiangtang-Sanjiang composite plate Duoma stratigraphic division Quegang district formation,and represents the volcanic activity of the south of Qiangtang area in Paleogene。Its main rock type is latite-trachyte.There are 3 dating samples which show the ages of (35.99±0.29) Ma、(37.2±0.65) Ma and (35.23±0.37) Ma.The geochemistry samples exhibit w(SiO2)=58.7%-65.51% which is high, A/NFC=0.046-1.029 which is low,w(MgO)=1.10%-2.95% which is high,∑REE=243.38×10-6-313.48×10-6,and δEu=0.77-0.91. It indicates that the basalt is slightly enriched in light rare earth elements(LREE)and without remarkable Eu depletion. Large ion affinity rock elements such as Rb and Th are high content. High field-strength elements such as Hf and heavy rare earth elements (HREE) are low content.Most samples shows that Ti, Ta and Nb are low content.w(La)/w(Sm) shows stable content.w(Sm)/w(Yb)=4.3-6.7,which is low. According to the features of rock geochemistry,the primitive magma originates from the special crust mantle transitional zone, which is based on the thickened continental crust of the Qinghai Tibet Plateau. Its forming is the initial intraplate continental extensional rift environment near the orogenic belt.
2016 Vol. 3 (6): 37-48 [Abstract] ( 310 ) RICH HTML PDF (2614 KB)  ( 232 )
49 Characteristics of Late Mesozoic extensional structures of Meixian in Guangdong Province
DI Wen, ZHUANG Wenming, LI Rui, WANG Jianrong, CHEN Junfeng, YU Deyan
Meixian in Guangdong Province, is located in the Lianhuashan fault zone, southern part of Zhenghe-Dapu fault zone. The 1:50 000 field geological survey and indoor analyses have indicated the existence of Late Mesozoic extensional structure system in the Meixian of Guangdong Province. This system consists of detachment fault and two stripper layers with different levels. Based on contact relationship and high-precise dating data of volcanic rocks, intrusive rocks and sedimentary rocks, we concluded that the time scale of this extensional structure system ranges from Late Jurassic to Early Cretaceous (160-135 Ma), with the peak time of extension around 145 Ma. Lianhuashan fault zone was previously believed to be formed around the early Paleozoic, and now it is confirmed to be a detachment fault formed at the Late Jurassic. So the Zhenghe-Dapu fault extensional system also occurred in the Late Mesozoic. The results above showed that the dominant tectonic activity in the southern China occurred in the Mesozoic, providing a new reference model for the study of regional metallogenic rules of hydrothermal metal deposit in the southern China.
2016 Vol. 3 (6): 49-56 [Abstract] ( 375 ) RICH HTML PDF (4687 KB)  ( 642 )
57 Achievements of airborne gravity survey in sea-land transition area around Tianjin
LIN Xiaoxing, CHEN Bin, ZHANG Xuanjie, WU Yun, FAN Jiang
Marine geological survey is significant important for the exploration of marine minerals, along with the increasing of human demands for marine mineral resources. The marine geological and geophysics survey in our country started late and is in a lower level now. However, as a quick and effective geophysics measurement, the airborne gravity survey plays an important role in the marine geological survey. The advanced GT-1A airborne gravity measurement system was introduced in 2006 and the airborne gravity survey at 1:200 000 scale was carried out in sea-land transition region around Tianjin for the first time in 2011.This survey collected 30 thousands kilometers measure data with high quality, implemented the sea-land continuous measurement in the sea- land transition area and filled the blank in the high-precision airborne gravity measure in this area. This paper has given a detailed description of the achievements in airborne gravity survey, and studied the Shijiutuo Salient in the study area from the view of airborne gravity. The basement of Shijiutuo Salient was concluded to be possessed segmentation and the new basement salient was outlined to give a conclusion for further oil and gas exploration. The high magnetic anomaly in Bozhong Depression was also discussed. In addition, some important recognitions were achieved by studying gravity character of the main structural units, basement and fractures in the sea-land transition region, which are important for basic geology and environment research.
2016 Vol. 3 (6): 57-62 [Abstract] ( 291 ) RICH HTML PDF (1067 KB)  ( 344 )
63 Characterization of groundwater recharge, runoff and drainage and their dynamic changes in Linhe, Inner Mongolia
YANG Zhiyan, SUN Biao, LI Yuanjie, DING Huijun
We have identified groundwater recharge, runoff , drainage characteristics and dynamic variation, and provided a reliable scientific basis for the development and protection of groundwater resources. Based on the long-term observation data and collecting research data of Linhe groundwater, we analyzed the regional groundwater recharge, runoff and drainage characteristics and influencing factors. The study area belongs Hetao irrigation area and human irrigation activities accounted for 65.5% of all replenishment. Human exploitation and drains ditches or other human activities accounted for 67.7% of all excretion. In addition, we studied the changing trends of groundwater level in the study area, and concluded that dynamic changes of groundwater level were consistent with irrigation activities in irrigation district. Dynamic changes of urban groundwater level were mainly affected by human exploitation.
2016 Vol. 3 (6): 63-67 [Abstract] ( 420 ) RICH HTML PDF (2163 KB)  ( 623 )
68 A preliminary understanding of water-rich regularity in Xinzhuang iron mining area, Peixian, Jiangsu Province
JING Jiajun, TAO Wenjie, GUAN Zhen
Xinzhuang iron mining area is a typical iron ore of metasomatic skarn contact type, and the main aquifer is Ordovician limestone. The conditions of the groundwater recharge runoff and drainage, the characteristics of the aquifer and water rich property of fault were analyzed in the mining area. The laws of water rich property in the mining area were firstly summarized. It is concluded that the ore pit water inflow is mainly controlled by the above limestone and also influenced by the fault structure. Due to the influence of the fracture filling, the water inflow of the fault is greatly varied, which will increase the risk of water invasion and seepage and also threaten the production safety directly. The research above can provide a reference for preliminary exploration of domestic mines of the same type, and provide the basis for the later mine exploration.
2016 Vol. 3 (6): 68-74 [Abstract] ( 308 ) RICH HTML PDF (6008 KB)  ( 302 )
75 Discussion on components content correction of shale gas with low desorption gas quantity
ZHAO Lipeng
With the method of field desorption and gas chromatography, the components content correction of shale gas with low desorption gas quantity was studied. Correction experiment was added besides normal field desorption experiments, and ideal gas state equation was also used to seek the correction parameters and their suitability. The results showed that the residual air within the desorption canister had a great effect on components content when desorption gas content is low. Volume fraction of methane will increase about 12.23%-54.44% generally if the residual air can be excluded. It is thus necessary that the components content of shale gas with low desorption gas quantity should be corrected.
2016 Vol. 3 (6): 75-78 [Abstract] ( 334 ) RICH HTML PDF (822 KB)  ( 272 )
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