Abstract:

After two infilling adjustment and repeated fracturing on the third type of Chaoyanggou oil field, effective drive systems are still unable to be established in part of the reservoirs, and the measure effect and oil recovery degree is poor. Considering the insufficient understanding on fracture extending and fracturing stimulation scale of heterogeneous reservoir, 3D modeling on reservoir are performed by combining logging and seismic data and the asymmetric cracks are predicted based on elastic theory. Concepts named “relative stress” and “stimulation ratio” are raised, and the nonlinear relation between these two parameters is given. The scale of “relative stress” which could produce the supporting fracture is confirmed, and the fracturing stimulation scale could be judged. It would play important role on the layers selecting during the late development of oilfield and eventually to improve oilfield recovery degree.

Key words:  logging and seismic data combination, heterogeneous reservoir, 3D modeling on stress field, relative stress, stimulation ratio

摘要： 朝阳沟油田Ⅲ类区块井网经过两次加密调整和重复压裂, 部分储层仍无法建立有效驱动体系, 油水井措施效果差, 剩余油采出程度低。考虑到对压裂缝扩展条件及非均质储层改造程度认识不足的实际情况, 通过测井与地震联合的手段开展油藏三维地应力场建模, 以弹性理论为基本依据, 预测非对称压裂缝全缝长扩展情况, 提出“相对应力”和“改造因子”概念, 给出相对应力?改造因子非线性经验关系式, 划定形成填砂裂缝的相对应力值范围, 并据此判断储层压裂后改造规模情况。研究结果对油田开发中后期开发层系的选定, 提高油田最终采收程度将起到较重要的指导作用。

关键词: 井震联合, 非均质储层, 应力场建模, 相对应力, 改造因子