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基于改进模糊综合评判法的断层封堵性综合评价
张翥, 严恒, 汪新光, 高凌, 李金池
PDF(2039 KB)
PDF(2039 KB)
基于改进模糊综合评判法的断层封堵性综合评价
Comprehensive Evaluation of Fault Sealing Based on Improved Fuzzy Comprehensive Evaluation Method
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断层封堵评价分为垂向封堵评价和侧向封堵评价.前人多采取综合模糊评价法综合评价断层封堵性，模糊综合评判法的评价结果受评价分值和权重系数影响，传统综合评判法的各参数评价分值通过最大隶属度原则获取，忽视了同一类评价标准的内部差异，精度较低，且权重系数采取经验赋值或同等权重赋值，与实际区域地质环境有所出入.本次研究综合考虑断层力学背景、岩性对置关系、断储配置关系等定性参数，结合断层岩泥质含量、断面正压力、断储排替压力及断层应力特征等定量参数的影响，实现了参数的评价标准定量化分值表示；且基于区域各项参数统计分析，各项参数权重系数的确定通过层次分析法予以改进，权重系数更符合区域规律.选择涠西南凹陷二号断裂带A块潜力目标作为靶区，运用该方法进行评价，取得了较好效果；与前人研究方法对比，精度存在显著提高.
The evaluation of Fault sealing is divided into the evaluation of vertical sealing and the evaluation of lateral sealing. Previous studies mostly adopted the comprehensive fuzzy evaluation method to comprehensively evaluate the fault sealing performance. However, the evaluation results of the fuzzy comprehensive evaluation method are affected by the evaluation score and weight coefficient, which leads to the following two problems. Firstly, the evaluation score of each parameter of the traditional comprehensive evaluation method is obtained through the principle of maximum membership degree, ignoring the internal differences of the same kind of evaluation standards, resulting in low accuracy; secondly, the weight coefficient adopts empirical assignment or equivalent weight assignment, which is different from the actual regional geological environment. This study comprehensively considers the qualitative parameters such as fault mechanics background, lithology opposition relationship and fault reservoir configuration relationship, combined with the influence of quantitative parameters such as fault rock shale content, section normal pressure, fault reservoir displacement pressure and fault stress characteristics, so as to realize the quantitative score representation of the evaluation standard of quantitative parameters. Based on the statistical analysis of regional parameters, the weight coefficients of various parameters are determined and improved by analytic hierarchy process. The weight coefficient is more in line with the regional law. Block A of No.2 fault zone in Weixinan sag is selected as the target area for evaluation, and good results are obtained. Compared with previous research methods, the accuracy is significantly improved.
垂向‒侧向断层封堵性 / 综合定量评价 / 层次分析法 / 二号断裂带 / 储层评价 / 石油地质
vertical-lateral fault plugging / comprehensive quantitative evaluation / analytic hierarchy process / No.2 fracture zone / reservoir evaluation / petroleum geology
P618.13
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