构造裂缝定量预测方法——以济阳坳陷桩海地区太古宇为例

Quantitative Prediction of Tectonic Fractures—Archaean in Zhuanghai Area of Jiyang Depression

裂缝性油气藏储层较为复杂,其主要储集空间是多期构造运动产生的大量构造裂缝,制约着油气勘探与开发。利用构造应力场结合有限元数值模拟技术,以济阳坳陷桩海地区太古宇为例,建立了埕岛—桩西地区地质模型,模拟计算后得出了济阳坳陷埕岛-桩西地区构造应力云图,对研究区裂缝发育态势进行了模拟分析。经钻井资料、岩心描述等验证后证明,该方法可以较好地预测裂缝发育情况。研究区裂缝带在断层及其周围发育良好,表明这些地区应力较为集中,显示裂缝发育与断层附近应力大小具有较好的对应关系。

The reservoirs of the fractured oil and gas were complex,and their reservoir space is mainly a large number of structural fractures caused by a multi-stage tectonic movement,which restricts the region＇s oil and gas exploration and development. So the quantitative prediction of the structural fractures was extremely urgent. This paper,taking Archaean in Zhuanghai,Jiyang Depression as an example,combines the tectonic stress field with the finite element numerical simulation techniques to build the geological model in Chengdao-Zhuangxi area. After analog computation,the ChengdaoZhuangxi tectonic stress map of Jiyang Depression is got. Based on this,the fractures development situation is then analyzed in the following. It is proved to be a better way in predicting fractures development situation by drilling data and core description. In the study area,fracture zones are well developed in the faults and their surroundings,and this indicates that the stress is more concentrated in these areas and that the fracture development and stress size around the fault have better correspondence.