MQ地区断层封闭性模糊综合评判

Synthetic Fuzzy Judgment of Fault Sealing in MQ Area

运用模糊综合评判方法分别对MQ地区NEE、NNW、EW等3种走向断层的封闭性进行了定量评价。自沙一段沉积期(油气最早充注期)以来,不同走向的断层封闭性存在很大的差异。NEE向断层侧向封闭性差,以侧向输导作用为主;NNW向断层在其后的不同地质时期内封闭性不同,整体表现为封闭、开启相互交替的特点;EW向断层具有封闭特征,在局部地区与NNW断层形成断层遮挡油气藏,分析结果与实际勘探状况基本一致。

By analyzing three kinds of strike faults of NNE,EW,NNW,in MQ area,the sealing in hydrocarbon accumulation was evaluated by using synthetic fuzzy judgment,the opening or sealing of faults in hydrocarbon accumulation were analyzed. Faults in NEE was poor in sealing,it was mainly lateral sealing; faults in NNW were different sealing properties at different geological stages. It reflects characters between opening and sealing; the EW fault presents the characteristics of sealing,and effectively confining oil and gas. In local district some hydrocarbon reservoir forming by EW fault matching with NNW fault. The analytical result is consistent with actual situations from exploration.