大焦石坝JD区块页岩气产能与构造变形的响应关系

Response Relationship between Shale Gas Productivity and Structural Deformation in JD Block of Large Jiaoshiba Area

摘要: 焦石坝地区上奥陶统五峰组-下志留统龙马溪组下段发育一套优质页岩层，页岩品质横向分布较为稳定。通过近几年涪陵页岩气田的开发实践，发现水平井单井产量与埋深、微构造形态、岩层倾角以及岩层曲率等构造因素关系密切，但不同区块对页岩气单井产量起控制作用的主控因素存在差异。从构造因素出发对JD区块的单井产量差异进行分析，明确了该区块控制产量的主要构造因素，认为埋深以及岩层倾角是制约页岩气产能的关键因素，而微构造以及岩层曲率仅在局部区块对页岩气产能起到控制作用。

Abstract: A set of high-quality shale formation was developed in the lower segment in Wufeng Formation of the Upper Ordovician-Longmaxi Formation of Lower Silurian in Jiaoshiba Area, where the quality of shale was stable in lateral distribution. Through development practices of Fuling Shale Gas Field in recent years, it was found out that the horizontal single well production was closely related with gas buried depth, the morphology of microstructure, dip angle of formation and strata curvature. However, the main controlling factors of shale gas single well production were varied in different blocks. Based on the structural factors, the difference of single well production in JD Block was analyzed, and the main structural factors controlling production in the block were identified. It is considered that buried depth and dip angle of formation are the key factors restricting shale gas productivity, while microstructures and strata curvature only control shale gas productivity in local blocks.