尕斯库勒油田跃灰1井区E3^2灰层裂缝预测

FRACTURE PREDICTION OF E32 RESERVOIR IN YUEHUI 1 WELL BLOCK, GASIKULE OILFIELD

根据研究区地质特征 ,在建立地质模型、反演标准和力学模型的基础上 ,运用有限元方法对柴达木盆地尕斯库勒油田跃灰 1井区干柴沟组油藏进行了古构造应力场数值模拟和裂缝预测。模拟结果与实测资料基本吻合。共轭剪破裂的方位在不同构造部位和不同的埋深有一定的差别 ,剪切缝主要为NEE向和NWW向。纵张裂缝和横张裂缝的方位差别不大 ,横张裂缝主要为近EW向 ,纵张裂缝主要为近SN向。构造轴部和高部位裂缝比翼部和低部位发育 ,随着构造埋深的增加 ,裂缝发育程度增强。

According to the geological features of studied area, geologic model, inverse model and dynamic model have been established. Numerical simulation of paleotectonic stress field and fracture prediction of the E 32 reservoir in Yuehui 1 well block of Gasikule oilfield in Qaidaim basin have then been made by using finite element method. The paleotectonic stress field, fracture direction and density in the main oil-bearing layers are mapped out. The results got from numerical simulation are consistent with the measured data. Fracture directions are somewhat different in various tectonic position and burial depth. Shear fractures are mainly in NEE and NWW directions. Tension fissures are mainly in near E-W and near S-N directions. Axes and higher parts of structures generally have higher fracture density than the limbs have, and the density would increase with increasing of burial depth.