高邮凹陷西部控油断层封闭性研究

Sealing property of oil-controlling fault in west Gaoyou Sag

黄 峰 张卫海 王有智

中国石油大学地球资源与信息学院，山东  东营  257061

College of Geo-Resources and Information, China University of Petroleum, Dongying 257061, China

复杂断块区断层封闭性的研究对于确定油气藏的分布具有重要意义。分析了高邮凹陷西部地区主要控油断层剖面的岩性配置、泥岩涂抹因子、断层活动期与生排烃期的配置，以及断裂带泥质质量分数等，应用模糊综合评价法进行了断层封闭性综合评判。结果表明：各断层在戴南组沉积期较三垛组封闭性差，可作为油气运移通道，凹陷内生成的油气在此时期可沿断层向上运移，在构造高部位聚集成藏；三垛组沉积末期至今，断层封闭性较好，有利于油气藏的保存。

In complex fault-block regions, it is important to study the fault sealing property to determine the distribution of reservoirs.This paper analyzes the lithologic combination relations, mudstone smear factor, collocation of fault activity stage and hydrocarbon generating and expelling, shale content in the faulted zone for the main oil-controlling fault section in the western area of Gaoyou Sag. The fault sealing property was also evaluated by using the fuzzy synthesized evaluation method. The study results show that the fault sealing is worse in the depositional stage of Dainan Formation than in Sanduo Formation, which may be regarded as the
pathways of hydrocarbon migration. The hydrocarbon generated in the sag can migrate upward along the faults at this stage, which accumulates in the structural high. From the late stage of Sanduo Formation to now, the fault sealing is better, which is beneficial to the conservation of hydrocarbon accumulation