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《Geological Science and Technology Information》 2014-03
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Characteristics of “Subsequent” Tight Gas Accumulation:A Case from Badaowan Formation of Lower Jurassic in Baka Gas Field,Tuha Basin

Wang Guoting;Li Yilong;He Dongbo;Jiang Ping;Cheng Lihua;PetroChina Institute of Petroleum Exploration & Development;  
Primary tight gas accumulation or normal gas accumulation reservoirs that experienced later reservoir densification can form the"subsequent"tight gas accumulation after multistage readjustment influenced by multistage tectonic movements.According to these two factors,sequence between gas charging and reservoir compaction and influence from later tectonic movements,"subsequent"tight gas accumulation can be divided into A and B type.Type A reservoir experience disification first,then gas accumulation and after that experience structural reworking,however B type develop with the sequence of gas accumulation,densification and reworking.Due to multistage orogenic movements of Bogda Mountain,"subsequent"tight gas accumulation occurred in Baka gas field of Tuha basin.The distribution of sweet spots is obviously controlled by local high structural locations.Main sweet spot types are "physical-property"sweet spots and"fracture"sweet spots.The formation of"subsequent"tight gas accumulation can be divided into four stages:physical-property trap formation and initial charging;differential accumulation;initial preservation and destruction;intensive destruction and residual.The complicated and multistage stacked"subsequent"tight gas accumulation formed finally after later multistage tectonic movements in Baka gas field.
【Fund】: 中国石油天然气股份有限公司重大专项(2010E-23)
【CateGory Index】: P618.130.24
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