金湖凹陷汊涧地区断层封闭性综合定量评价及应用

摘要

Faults are the main oil-gas migration pathways in Chajian area and can also form associated hydrocarbon reservoirs,thus study on fault sealing ability is of great significance for determining the distribution of reservoirs. Through analysis of fault characteristics,fault-moving periods,lithologic association on two sides of fault,shale smear and normal stress on fault surface,we studied the sealing ability of four major reservoir-controlling faults in Tian79 block and Tian89 block,and then performed judgment by applying the fuzzy synthesized evaluation method. Based on the analysis of fault sealing ability,favorable traps were predicted. The results show that fault sealing abilities are good as a whole for E1f4. For E1f2,fault sealing abilities are good-general as a whole. It is likely to find favorable traps inside or near the Chajian Sub-sag.%断层是汊涧地区油气运移的主要通道，也能形成与之相关的油气藏，断层封闭性的研究对于确定油气藏的分布有着极为重要的意义。通过研究断层特征、断层活动期、断层两盘岩性配置关系、泥岩涂抹及断面正应力等控制封闭性能的各个要素，对汊涧地区天79块、天89块4条主要控藏断层封闭性分析，并应用模糊综合评价方法进行综合评判，在此基础上分析判断油气成藏模式，预测有利圈闭。结果表明：阜四段断层封闭性总体评价较好，阜二段断层封闭性总体评价较好-中等；汊涧地区有利圈闭应该在汊涧次凹内部或附近。