论文部分内容阅读
断层封堵性取决于储层与非储层的并置接触关系,或具有较高毛管入口压力的断面岩性发育情况。我们可以采用精细地震编图和井资料分析来评价断层的封堵性,主要分为以下两个步骤:第一步是通过编绘某一层位的构造图及断面等值线图来识别断面附近的储层并置区;第二步是分析砂岩与砂岩接触是否能形成一个压力差。 我们定义两种与岩性相关的属性:断层泥比率和滑抹因子。断层泥比率是根据井中的岩石估算细粒物质夹杂带入断层泥中的比例;滑抹因子方法(包括粘土滑抹能量和泥质滑抹因子)是估算断层活动期间,断层拖带的断面页岩厚度。这些参数随断面变化而变化,说明断层不能简单地定义为封堵性或非封堵性。 使用这些参数的一个重要环节是利用已知井资料对断层两侧具明显压力差的地区进行标定。通过对布伦特省、尼日尔三角洲及哥伦比亚盆地等地区的研究表明,尽管其地质背景各不相同,但取得的结果具有显著的一致性,例如,泥质含量约20％是最小跨断层压力差与最大封堵的门限值。
Fault sealing depends on the juxtaposed relationship between reservoir and non-reservoir, or the lithologic development of the section with higher capillary inlet pressure. We can use fine seismic mapping and well data analysis to evaluate the fault sealing, which is mainly divided into the following two steps: The first step is to identify the cross-section by drawing the structure map and the contour map of a certain horizon The nearby reservoir is juxtaposed; the second step is to analyze whether the sandstone is in contact with sandstone to form a pressure difference. We define two lithology-related attributes: fault mud ratio and slip factor. The fault mud ratio is a measure of the fraction of fine-grained material inclusions introduced into the fault mud from the rock in the well. The sliver factor methods (including the clay slip energy and the mud slippery factor) are estimates of the cross-section shales thickness. These parameters vary with section changes, indicating that the fault can not be simply defined as blocking or non-blocking. An important part of using these parameters is the use of well-well data to calibrate areas with significant pressure differences across the fault. Studies conducted in Brent, the Niger Delta and the Columbia Basin have shown that although the geological backgrounds vary, the results obtained are significantly consistent. For example, about 20% of the mud content is the minimum cross-fault pressure difference Threshold with maximum blockage.