摘要
准噶尔盆地火山岩油气藏表现为西油东气的聚集特点,盆地东部吉木萨尔凹陷石炭系火山岩油气藏是勘探的潜在领域。前期该区石炭系烃源岩发育特征及火山岩储集体平面展布形态不清,依据盆地东部克拉美丽气田、五彩湾气田、北三台—吉木萨尔凹陷油气显示井的岩心、薄片鉴定,结合录井、测井、物性分析化验及试油成果资料,系统评价吉木萨尔凹陷石炭系烃源岩生烃潜力,指出火山岩储集体平面展布规律,综合分析成藏条件,总结成藏模式,为该区天然气勘探提供地质依据。结果表明,研究区石炭系存在多套烃源岩,其中松喀尔苏组b段(C1sb)烃源岩发育南、北两大烃源槽,南部烃源槽发育区以吉木萨尔凹陷最为有利:烃源岩厚度大、有机质丰度高,已达高成熟阶段,具备形成大中型气田的资源基础;储集体以爆发相火山角砾岩和溢流相安山岩为主,发育孔隙、裂缝双重介质的储集空间;此外研究区石炭系构造变形弱,盖层厚度大,保存条件好,烃源岩生气后沿断裂向上疏导就近运移至圈闭中聚集成藏,天然气勘探潜力大。
The volcanic rock oil and gas reservoirs in Junggar Basin are"west oil east gas"accumulation,Carboniferous volcanic reservoirs in the Jimusar Sag are potential areas for exploration. In the early stage,the development characteristics of Carboniferous source rocks and the plane distribution pattern of volcanic reservoir are not clear. Based on the core and thin section identification of the oil and gas display wells in the Kelameili gas field,Wucaiwan Gas Field and Beisantai-Jimusar Sag in the eastern part of the basin,and combined with logging,well Logging,physical analysis and testing results,the hydrocarbon generation potential of Carboniferous source rocks in Jimusar Depression is comprehensively evaluated,and the plane distribution law of volcanic reservoir is pointed out. Oil and gas reservoir conditions are analyzed and their patterns are summarized,providing geological basis for natural gas exploration in the area. The results show that there are many sets of source rocks in the Carboniferous in the study area,among which the source rocks of the section B of the Songkaersu Formation(C1sb)are developed into two major hydrocarbon source troughs:The south and the north. Jimusar Sag is the most favorable area in southern hydrocarbon source troughs:Large thickness,high abundance of organic matter and high maturity of source rock,providing a resource base for the formation of large and medium-sized gas fields. The reservoir is mainly composed of explosive volcanic breccia and overflow andesite,and the reservoir space is composed of pore and fracture dual media. In addition,Carboniferous in the study area is characterized by the weak structural deformation,the thick caprock and the good preservation condition. After the hydrocarbon generation,gas migrated up along the faults and accumulated in the traps. All these made the gas exploration potential in the study area great.
作者
陈军
陈静
李娜
王忠泉
CHEN Jun;CHEN Jing;LI Na;WANG Zhong-quan(Research Institute of Exploration and Development,Petro China Xinjiatig Oilfield Company,Kalamay 834000,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2020年第7期952-961,共10页
Natural Gas Geoscience
基金
国家科技重大专项“大型油气田及煤层气开发国家科技重大专项”(编号:2016ZX05003-005)资助~~。
关键词
石炭系
火山岩
天然气
成藏条件
勘探潜力
准噶尔盆地
吉木萨尔凹陷
Carboniferous
Volcanic rock
Natural gas
Elements of hydrocarbon reservoir formation
Exploration potential
Junggar Basin
Jimusar Sag
