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顺向断块断层及地层倾角与断层启闭性的关系
——以济阳坳陷勘探实践为例
断块油气田
2020年 27卷 第6期
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Title
Relationship between fault opening?鄄closing and dip angles of fault and stratum
in forward fault block: taking exploration practice of Jiyang Depression as an example
单位
中国石化胜利油田分公司油气勘探管理中心，山东 东营 257001
Organization
Oil and Gas Exploration Management Center, Shengli Oilfield Company, SINOPEC, Dongying 257001, China
摘要
断陷盆地油气勘探实践发现，反向断层控制的断块圈闭成藏概率远高于顺向断层控制的断块圈闭，因此，顺向断层封堵性的研究是其控制的顺向断块圈闭可靠性的关键。通过分析济阳坳陷多口钻于顺向断层控制的顺向断块圈闭的探井失利原因发现，断层、地层的倾角控制了断层的启闭性。根据这些探井所在顺向断块圈闭的断层、地层倾角的统计结果，综合顺向断层封堵性物理模拟实验结果，总结提出在“断层视倾角小于65°、地层视倾角小于20°”这2个条件同时具备时，顺向断层的封堵性相对较好。因此，顺向断层倾角、地层倾角的大小是断块圈闭可靠性评价过程中需要考虑的重要环节。该结论为断陷盆地顺向断层控制的断块圈闭有效性预测提供了更简单、有效的方法。
Abstract
Oil and gas exploration practices in faulted basins have found that the accumulation probability of fault block traps controlled by reverse faults is much higher than that of fault block traps controlled by forward faults. Therefore, the study of forward fault sealability is the key to predicting the reliability of forward fault block traps. Through the analysis of the failure reasons of many exploratory wells drilled in the forward fault block traps controlled by the forward faults in Jiyang Depression, it is found that the dip angle of the fault and the fault control the opening and closing of the fault. According to the statistical results of the faults and the formation dip angles of the forward fault block traps where multiple exploratory wells are located and the comprehensive physical simulation results of the sealing properties of the forward faults, it is concluded that the apparent dip angle of the fault is less than 65° and the apparent dip angle of the formation is less than 20°. When the two conditions are met at the same time, the sealability of the forward fault is relatively good. Therefore, the dip angle of the forward fault and the size of the formation dip are important links that need to be considered in the process of fault block trap reliability evaluation. This conclusion provides a simpler and more effective method for predicting the effectiveness of fault block traps controlled by forward faults in faulted basins.
关键词：
顺向断块;
断层倾角;
地层倾角;
断层封堵性;
圈闭可靠性;
Keywords:
forward fault block;
fault dip;
stratigraphic dip;
fault sealing;
trap reliability;
DOI
10.6056/dkyqt202006011
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