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Chang Xinghao(Geological Engineering Institute of the Fifth Survey Team of Geology and Mineral Resource Ministry),Song Kai:  
Located on Maigaiti slope of the southwest depress in Talimu Basin,Bashituo structure is an anticline caused by antithetic drag of the faults in Bashituo—Xianbazha structural belt.About 10 exploration wells drilled in the structure are of various oil gas showing.Commercial gas stream is obtained from the Carboniferous Xiaohazi Formation in Mai 3 and Mai 4 wells at the top of the structure,indicating that it is a favourable gas bearing structure.Analysis of oil and gas samples showes that Xiaohaizi gas pool is a gas condensate reservoir with He 0 68%~0 73%,crude oil density 0.776 3 g/cm 3,GOR 4 286 m 3/m 3.geochemical and petrophysical data and production data as well as the structural evolution analysis indicate that Bashituo structure has a favourable source reservoir cap assemblage,sufficient oil source and structural conditions.Xiaohaizi gas reservoir with high N and high He is related to the great invasion and eruption of basic magma created by teanstensional fracturing deeply culling through the earth crust.The He released from magma is entrapped and preserved in gas reservoir,and faults act as the migration pathway for gases.
【CateGory Index】: P618.13
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Chinese Journal Full-text Database 2 Hits
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1 XIAO Qiu-sheng, CHEN Feng-liang, YAN Yuan-feng, LOU Guo-quan (Institute ofGeological Sciences, Jiangsu Oilfield Branch of SINOPEC, Yangzhou 223009, China );WORK FLOW CHART AND KEY TECHNOLOGY OF INTEGRATED EXPLORATION-DEVELOPMENT OF OIL-GAS ACCUMULATION IN SMALL COMPLEX RIFTS IN JIANGSU[J];Geology of Anhui;2004-04
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【Secondary Citations】
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