四川盆地通南巴构造带陆相层系气藏的气源与成藏期分析

发布时间：2018-08-29 07:38

【摘要】：川东北地区陆相层系天然气的研究工作取得了重要的进展,但四川盆地通南巴构造陆相层系天然气组成特征比较复杂,气源方面的认识一直存在争议,成藏时间尚不明确。在对川东北地区典型气藏地质特征及天然气地球化学特征剖析的基础上,探讨了通南巴构造陆相层系天然气的气源及成藏期次。结果表明,研究区陆相层系天然气以烃类化合物为主,非烃含量低,甲烷含量在95%以上,为海相、陆相气源的混合气,主要来源于陆相地层须家河组及自流井组烃源岩的贡献。通南巴构造陆相层系不同含气层段总体经历了2期成藏事件:(1)须家河组在中侏罗世早期至晚侏罗世中期、早白垩世中期各经历一次成藏事件;(2)自流井组在中侏罗世早期至晚侏罗世早期、早白垩世各经历一次成藏事件。
[Abstract]:Important progress has been made in the study of natural gas in continental strata in northeast Sichuan, but the characteristics of natural gas composition of continental strata in Tongnanba structure of Sichuan Basin are quite complex, the understanding of gas source has always been controversial, and the time of reservoir formation is still unclear. Based on the analysis of the geological and geochemical characteristics of typical gas reservoirs in northeast Sichuan, the gas source and gas accumulation period of continental strata of Tongnanba structure are discussed. The results show that the natural gas of continental strata in the study area is mainly composed of hydrocarbon compounds, with a low non-hydrocarbon content and a methane content of more than 95%. It is a mixture of marine and continental gas sources, mainly derived from the contribution of the source rocks of the Xujiahe formation and the artesian well formation in the continental strata. The different gas bearing formations in the continental stratigraphic system of Tongnanba structure generally experienced two stages of reservoir formation: (1) the Xujiahe formation was from the early Middle Jurassic to the middle Jurassic. In the middle of early Cretaceous, there were one reservoir forming event in each group; (2) one reservoir forming event occurred in early Middle Jurassic to early late Jurassic, and one in early Cretaceous.
【作者单位】：中国石油大学(北京)地球科学学院;油气资源与探测国家重点实验室;中国石油天然气股份有限公司华北油田分公司地球物理勘探研究院;
【基金】：“十二五”国家科技重大专项(编号:2011ZX05002-006)资助
【分类号】：P618.13

【相似文献】