关键词: 准噶尔盆地, 侏罗纪, 深盆气藏, 致密砂岩, 异常压力, 油气勘探

Abstract: In Junggar basin, deep-buried basin structures are consisted of margin frontal depression and large scale of slope structure. Continental facies mud-sandstone developed in Jurassic, thus forming source-reservoir assemblage, and the wide-spreading, and developing tight sandstone reservoir body has formed in large scale delta system. The major gas-source rocks in deep-buried basin structure gas reservoir are coal-bearing systems, with spreading in wide area. They are rich in organics, commonly in mature-and over-matured stages. The formation, migration and accumulation commence from Jurassic and continue all the way through to the time being. They are dominated with abnormal high pressure, possess favorable geological conditions needed for formation of deep-buried basin structured gas-pools. The paper indicated the favorable explorations are in three directions: south margin, Maqiao arch, Dabasong arch, and their slope area. The predicted proven geological reserves will be 1.5×10¹² m³(OOIP).

Key words: Junggar basin, Jurassic, deep-buried basin structure gas pools, tight sandstone, abnormal pressure