摘要
临南洼陷是惠民凹陷的生烃中心,临邑断层作为临南洼陷的主控断层对油气的运移和聚集起着重要的作用,弄清临邑断层的封闭性具有重要意义。影响断层封闭性的主要因素有断层的力学性质、几何性质、断面所受正应力、断层两侧的界岩关系以及泥岩涂抹系数5个方面。运用模糊数学的方法对影响断层封闭性的5个因素进行了定量评价,结果表明,影响本区断层封闭性最重要的因素为主应力性质,其次为断层两侧界岩关系以及泥岩涂抹因子。临邑断层整体上都具有很好的封闭性,但在不同的层位和空间位置上封闭性又存在着一定的差异:沙河街组的封闭性相对最好,馆陶组次之,东营组最差;空间上西段的封闭性相对要差。
The Linnan depression is a center of hydrocarbon generation in the Huimin sag. The Linyi fault, as the master fault of the Linnan depression, plays an important role in the migration and accumulation of oil and gas. Therefore,it is critical to reveal the sealing capability of the Linyi fault. The factors that affect the fault sealing mainly include the geometry and mechanical property of the fault, the normal stress to the fault plane, the litholoy on the two sides of the fault and the shale smear rati- o. In this paper, we used the method of fuzzy mathematics to quantitatively evaluate the fault＇s sealing capability so as to find out the major control factors. Results show that mechanical property is the most important factor, and the lithology on the two sides of the fault and the shale smear ratio are the second. The Linyi fault is in general well closed, but there is difference in different strata and places. According to our calculation, the Shahejie Formation is the best one in terms of sealing condition, the Guantao Formation the second and the Dongying Formation the worst. In space, the sealing condition is better in the west.
出处
《海洋地质动态》
北大核心
2011年第1期42-46,共5页
Marine Geology Letters
基金
国家自然科学基金(40672089)
山东省自然科学基金(ZR2009EQ002)
关键词
临南洼陷
断层封闭性
模糊数学
Linnan depression
fault sealing
fuzzy mathematics
