叠合概率法在碳酸盐岩储层评价中的应用——以辽河坳陷西部凹陷高升地区沙四段为例

doi:10.3969/j.issn.1672-7703.2019.03.009

摘要/Abstract

摘要： 辽河坳陷西部凹陷高升地区沙四段碳酸盐岩储层的形成和发育主要受沉积相、埋藏溶蚀作用及构造破裂作用的共同控制，储层在微观和宏观上具有强烈的非均质性，储层影响因素较多且孔渗关系复杂。为了避免仅靠某一单因素、少数有限的钻井资料及物性测试资料进行区域性碳酸盐岩储层评价容易出现偏差的问题，运用特征选择中的Relief F算法对碳酸盐岩厚度、粒屑灰（云）岩厚度、孔隙度、渗透率、脆性指数及裂缝密度6项参数进行权重分析，并确定各参数权重值，然后使用叠合概率法将不同特征平面图加权叠合形成一张多因素概率图，通过划分概率区间最终形成储层评价图。同时综合考虑西部凹陷高升地区的构造特征及沉积相特征，对研究区沙四段碳酸盐岩储层进行研究评价，评价结果与研究区已勘探油气分布具有较好的一致性，并预测出有利勘探区带。

关键词: 辽河坳陷西部凹陷, 沙四段, 碳酸盐岩储层, 权重分析, 叠合概率法

Abstract: The formation and development of carbonate reservoirs in 4^th member of Shahejie Formation (Es₄) in Gaosheng area, western sag in Liaohe depression, are mainly controlled by sedimentary facies, burial dissolution and tectonic fractures. Whether microscopically or macroscopically, the reservoirs are strongly heterogeneous and controlled by many factors, and the porosity and permeability are very complex. In order to avoid the deviation caused by single factors, and less drilling and logging data when evaluating regional carbonate reservoirs, the Relief F algorithm for feature selection was used to analyze the thickness, porosity, permeability, brittleness index and fracture density of the carbonate rock and the grained limestone (dolomite), and their weights; then the feature plans were overlapped to create a multi-factor probability map; and finally a reservoir evaluation map was built by dividing the probability. In addition, considering the structural and sedimentary facies characteristics in research area, the carbonate reservoirs in Es₄ were investigated and evaluated. The evaluation results are in good agreement with the results from field exploration. Based on the results, favorable exploration zones were predicted.

Key words: western sag in Liaohe depression, 4^th member of Shahejie Formation, carbonate reservoir, weight analysis, overlapping probability method

中图分类号:

李阳, 代宗仰, 黄蕾, 周晓龙, 葛伟峰, 单俊峰, 刘宁. 叠合概率法在碳酸盐岩储层评价中的应用——以辽河坳陷西部凹陷高升地区沙四段为例[J]. 中国石油勘探, 2019, 24(3): 361-368.

Li Yang, Dai Zongyang, Huang Lei, Zhou Xiaolong, Ge Weifeng, Shan Junfeng, Liu Ning. Application of overlapping probability method in carbonate reservoir evaluation: a case study on 4^th member of Shahejie Formation in Gaosheng area of western sag, Liaohe depression[J]. China Petroleum Exploration, 2019, 24(3): 361-368.

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