断层封闭性定量表征在稠油油藏开发中的探索——以渤海JX油田西块东营组为例

Quantitative characterization of fault sealing in development of heavy oil reservoirs: a case study of Dongying Formation of West Block in JX Oilfield in Bohai Sea

杨志成 刘宗宾 张占女 程奇 朱志强

中海石油（中国）有限公司天津分公司渤海石油研究院， 天津 300459

Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Limited, Tianjin 300459, China

针对复杂断块稠油油藏采收率较低、断层附近剩余油预测难度大的难题，以渤海JX油田西块东营组为例，采用层次分析的方法将研究区发育的65条断层分为3类，分别为强封闭走滑断层、中—强封闭大断距断层和弱封闭小断距断层。结合开发研究需要，针对稠油油藏中对剩余油具有控制作用的弱封闭小断距断层进行精细解剖。综合岩心、测井、录井、地震等资料，依托Petrel三维地质建模￣数模一体化平台，构建了精细的断层模型和泥质质量分数模型；结合断层泥比率（SGR）计算公式，对断层封闭性进行定量表征，研究结果以传导率的形式导出。利用Eclipse油藏数值模拟软件对已开发井的含水率和压力进行分析，模型的准确性得到了有效验证，从而明确了断层附近控制的剩余油分布规律。通过精细预测制定了后期调整策略，对于稠油油藏中后期的剩余油挖潜以及注采井网完善起到了较好效果，预测累计增油量79.7×10４　m3，提高区域采收率3.5%。该研究结果对于类似受控于断层的剩余油研究与挖潜具有一定的指导意义。

With the low recovery rate of complex fault-block heavy oil reservoir, it is difficult to predict the distribution of remaining oil near the fault. In this case, taking the Bohai JX Oilfield as an example, the 65 faults developed in the area were divided into three categories by the analytic hierarchy process, namely, strong closed strike-slip fault, medium-strong closed large fault and weakly closed small fault. Then, an intensive research on weakly closed small faults was made to carry out the distribution of remaining oil in heavy oil reservoirs. Based on the 3D geological modeling platform of Petrel, a comprehensive fault model and shale content model were constructed, and the fault sealing was quantitatively characterized by the calculation formula of shale gouge ratio. After that, the calculation results were output in the form of transmissibility, and the analysis results of the moisture content and pressure of the developed wells are correct using Eclipse. Based on the results of the remaining oil research, an oilfield adjustment strategy has been developed to improve the well pattern and enhance oil recovery. It is predicted that the cumulative oil increase will reach 79.7×10４ m3, and the regional recovery rate will be increased by 3.5%. The research results have guiding significance for research of similar remaining oil in similar oilfield.

10.6056/dkyqt201901012