库车坳陷克深地区现今地应力场及储层裂缝数值模拟

克深三维区目前处于勘探开发的前期,需要明确地应力场及地下储层裂缝的分布规律,指导开发工作,但该区存在地层埋深大、取心困难、成像测井资料缺乏等实际情况,应力场研究及裂缝预测难度大。利用有限元分析方法,以井点现今地应力值为约束进行了克深三维区现今地应力场的数值模拟,同时建立了应力应变与裂缝参数的定量关系模型,利用古今应力场结合法对克深三维区的裂缝参数进行了预测,模拟结果显示构造高部位和断层带是低应力值区及裂缝的有利发育区。裂缝的数值模拟结果与测井解释结果对比表明,预测结果与实钻吻合度较高,裂缝预测效果较好。

Numerical simulation of current stress field and reservoir fracture in Keshen 3D area, Kuqa Depression

Keshen 3D area is now at an early stage of exploration and development, and distribution pattern of stress field and underground reservoir fracture need to be confirmed to guide subsequent exploitation. However, the high depth of strata, difficulty in coring and lack of image well logging data, which lead to the high difficulty in stress field research and fracture prediction, exist in this area. Numerical simulation of current stress field restrained by current stress value of single well is carried out by finitude element analysis, and the quantitative model of relation between stress-strain and fracture parameters is built. Fracture parameters are predicted by the method combining paleotectonic and current stress field, and the result shows that high structural section and fault belt are low stress area and beneficial development area of fracture. The comparison of numerical simulation and well logging interpretation demonstrates that they are highly fit, and the effect of fracture predicting is acceptable.