宝北区块构造应力场模拟及裂缝预测

以焉耆盆地博湖坳陷宝北区块为例,对由冲起构造模式控制的致密砂岩储层的裂缝发育特征进行系统研究,并在此基础上,对古应力场进行模拟,进而对研究区裂缝发育区进行预测.结果表明:宝北区块致密砂岩储层中裂缝发育,主要为天然构造缝,包括剪切裂缝、张性裂缝和挤压裂缝.采用三维有限元法进行精细地质建模和古构造应力场模拟,恢复了目的层在...

Simulation of tectonic stress field and fracture prediction in Baobei block

Taking Baobei block of Bohu depression in Yanqi Basin as an example, the fracture development characteristics of tight sandstone reservoir controlled by thrust structure model are systematically studied. On this basis, the paleo-stress field is simulated, and then the fracture development area in the study area is predicted. The results show that the fractures in the tight sandstone reservoir of Baobei block are developed,mainly natural structural fractures, including shear fractures, tensile fractures and compression fractures. Fine geological modeling and paleotectonic stress field simulation are carried out by 3D finite element method, the paleo stress field of the target layer under the thrust structure mode is restored, and the development degree of fractures is quantitatively predicted by comprehensive fracture rate. The fracture prediction results are consistent with the actual geological conditions, which provides reliable basic geological data for the development and adjustment of Baobei reservoir. Meantime, it provides a feasible method for the effective prediction of this kind of tight sandstone fractured reservoir.