火成岩古潜山储层裂缝表征方法

Fracture description method for igneous buried-hill

张雨晴 王晖 宋来明 高玉飞 王海峰

中海油研究总院，北京 100028

 (CNOOC Research Institute, Beijing 100028, China)

 火成岩潜山储层由于受风化溶蚀、构造运动等多种作用改造，裂缝成因多样，储层非均质性强，表征难度大，文中以渤海湾盆地大型火成岩古潜山油田S为例，提出了一套针对古潜山储层的裂缝表征方法。首先从成因分析入手，确定裂缝发育主控因素；在此基础上建立裂缝分布密度模型和离散裂缝网络模型；采用动静结合的方法对模型进行优选，得到合理的裂缝模型。应用结果表明，该模型用于油藏数值模拟，提高了模拟的准确性，提升了油藏数模预测效果。该方法实现了对火成岩潜山储层裂缝系统的精细表征，为油藏数值模拟及开发方案的编制提供了可靠的地质基础。

 With igneous buried-hill reservoirs reconstructed by tectonic, weathering and erosion processes, complex fracture causes and strong reservoir heterogeneity, it′s difficult to characterize the reservoir fractures. Taking the huge S Oilfield of igneous buried-hill in Bohai Bay as an example, the article proposes a set of methods for igneous buried-hill reservoir fracture characterization. Firstly starting from fracture genetic analysis, the main controlling factors of fracture development were determined, and fracture development density model and DFN model were established. Fracture models were verified and optimized by static and dynamic methods. The practical application shows that the model used in numerical simulation can improve the simulation accuracy and prediction effect. The method can accurately characterize reservoir fractures of igneous buried-hill and lay credible geological foundation for oilfield development plan.

10.6056/dkyqt201706009