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季刊,2016年6月创刊
主管:教育部
主办:中国石油大学(北京)
   清华大学出版社有限公司
出版:清华大学出版社有限公司
编辑:《石油科学通报》编辑部
主编:陈勉
地址:北京市海淀区学院路20号院
   902信箱中国石油大学期刊社
邮编:100083
电话:010-82377349
         010-89734040
E-mail:bops@vip.163.com
     本刊导读
An apparent breakthrough has been made in tight gas exploration in the edge of Ordos Basin, although tight gas  
exploration started late. The typical example of tight gas at the edge of the basin is the Upper Paleozoic tight gas in the Linxing  
area on the northeast edge of Ordos Basin. However, compared with the interior of the basin, the geological conditions at the  
edge of the basin are complex, and the reservoir-forming processes and the mechanism of tight gas reservoir adjustment and  
transformation by faults needs to be systematically revealed. Based on the analysis of tight gas reservoir distribution charac
teristics, reservoir fluid inclusion characteristics, and basin burial-thermal evolution history simulation in the Linxing area, the  
reservoir-forming process of fault-adjusted tight sandstone gas at the edge of the basin is now understood, and the reservoir-form
ing model is clarified. The tight gas reservoirs show differential distribution characteristics in three sets of reservoir-forming  
combinations. The number of in-source reservoir-forming combinations is the least, the number of near-source reservoir-forming  
combinations is in the middle, and the number of far-source reservoir-forming combinations is the most. The thickness of near
source gas reservoirs is the smallest, the thickness of inner source gas reservoirs is the middle, and the thickness of far source  
gas reservoirs is the largest. Fluid inclusions mainly occur in microcracks in quartz grains, and a small amount occurs in calcite  
cement and quartz overgrowths. The homogenization temperature of fluid inclusions ranges from 81.7 ℃ to 180 ℃, showing the  
influence of the Zijinshan magma intrusion on the thermal evolution of source rocks. There are two stages of natural gas charging  
and accumulation in the study area. In the early stage of gas accumulation, faults and fractures were not developed. The natural  
gas was mainly charged into the in-source reservoirs, supplemented by the near-source reservoirs. In the middle and late stages  
of hydrocarbon accumulation, a large number of faults and fractures were generated with the intrusion of the Zijinshan magma.  
Natural gas was preferentially charged into the near-source and far-source reservoirs along the faults and fractures caused by  
the intrusion of the magma, and the contribution to the in-source reservoirs was relatively tiny. Generally speaking, the tight  
gas charging at the basin edge is obviously controlled by faults and fractures, with faults playing the “gas pump.” To explore  
fault-adjusted tight sandstone gas reservoirs, we should attach great importance to studying faults and fractures.


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