川中古隆起龙王庙组特大型气田战略发现与理论技术创新

Theoretical and technical innovations in strategic discovery of a giant gas field in Cambrian Longwangmiao Formation of central Sichuan paleo-uplift, Sichuan Basin

2011年以来,在四川盆地川中古隆起磨溪—高石梯地区发现震旦系、寒武系特大型气田,主力含气层系包括震旦系灯影组灯二段、灯四段及寒武系龙王庙组,地质储量规模超过万亿立方米。在简要回顾川中古隆起大气区战略发现历程的基础上,系统阐述川中古隆起龙王庙组特大型气田的形成条件及油气富集规律,指出大型古隆起背景、大型网状供烃系统、规模化的颗粒滩储集层以及区域性的储盖组合是特大型气田形成的重要条件;针对龙王庙组超深、高温、高压等复杂地层条件,分别在测井、地震、钻井、储集层改造等方面进行了技术攻关,并形成了相应的配套成果,应用效果良好,展示了四川盆地震旦系—寒武系巨大的油气勘探潜力。

Since 2011, a giant gas field has been discovered in the Sinian and Cambrian strata in Moxi-Gaoshiti region, central Sichuan paleo-uplift, with the geological reserves reaching more than one trillion cubic meters. The main gas-bearing layers include Deng 2 Member, Deng 4 Member of Sinian Dengying Formation and Cambrian Longwangmiao Formation. Based on brief review of the exploration history of large gas province in central Sichuan paleo-uplift, the paper systematically describes the formation conditions and petroleum accumulation patterns of the giant gas field, and points out the large ancient uplift background, huge net of hydrocarbon supply system, large-scale particle shoal reservoirs and regional reservoir-cap combinations are important material conditions for the formation of the giant gas field. In view of the huge depth, high temperature, high pressure and some other complex formation conditions, a lot of efforts have been put into the research on logging, seismic, drilling, reservoir stimulation etc, and a series of accomplishments have been achieved, which work well in the exploration and development of gas in Sichuan Basin. The Sinian and Cambrian strata in the Sichuan Basin have a great potential for petroleum exploration.