塔中断层交汇与岩溶缝洞体系控制的油气成藏效应

来源期刊:中南大学学报(自然科学版)2015年第3期

论文作者:向才富 王建忠 庞雄奇

文章页码:952 - 962

关键词:差异运聚;岩溶作用;孔缝洞单元;碳酸盐岩;断层交汇部位;塔中

Key words:differential hydrocarbon migration and entrapment; karstification; pore-cavity-fracture unit; carbonate reservoir; fault intersection zone; central Tarim

摘    要:塔中45井区奥陶系礁滩体储层、塔中83井区鹰山组储层受岩溶作用以及断层交汇的多重影响,孔缝洞体系中油气水分布关系复杂,断层交汇部位是本区油气的注入点。油气沿断层交汇部位运移受岩石的破裂作用、断层对储层物性的改善作用、断层的多期活动和断层的内部结构4个因素共同控制。基于碳酸盐岩岩溶的相关研究成果,建立断层输导的岩溶缝洞体系基本模型。复杂孔-缝-洞体系中油气的差异运聚原理是分析油气在岩溶缝洞体系中运聚过程的关键,断层交汇平面上增加了岩溶体系作用范围,垂向上更易沟通多层岩溶缝洞体系,油气成藏表现出受断层交汇及岩溶作用形成的孔-洞-缝体系联合控制的差异运聚效应。

Abstract: The production, gas/oil ratio and the composition of the crude oils and natural gas in the TZ45 and TZ83 Well blocks are high at the intersection point of the NE and NW-strike fault and decrease gradually along the ridge of the structure. Thus, it can be inferred that the intersection zone is the hydrocarbon charging position. Hydrocarbon migration along faults intersection zone is jointly controlled by the effect of rock fracture, the improvement of physical properties by fault, the repeated fracturing during multi-stage tectonic movements and the internal structure of fault four factors. A complicated model of the pore-cavity-fracture system conducted by fault resulted from karstification was built according to the related research results about the carbonate karstification. The processes of the hydrocarbon migration and entrapment in that system were analyzed, which indicates that the complicated differential hydrocarbon migration is the key to interpreting this phenomenon. Under the joint control of fault intersections and karstification in the pore-cavity-fracture systems, the karstification system plane range increases, and in vertical are more likely to connect multilayer karstification systems, and the hydrocarbon migration shows the differential accumulation manners.

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