大邑构造须二段储层裂缝预测

通过分析大邑构造带的构造成因及动力来源,总结了该区构造演化模式。利用古构造应力场二维数值模拟,对研究区岩体的破裂程度进行预测,然后计算出该区岩体的破裂接近程度,并确定了岩体破裂程度与裂缝发育的关系以及裂缝发育级别,继而对裂缝发育程度、裂缝类型和产状进行综合预测。结果表明:大邑构造须二段储层裂缝较发育,主要发育在构造高点部位及其附近区域和断层及其附近区域;储层在2期构造应力场作用下共形成了2期5组裂缝;裂缝的主要延伸方向为北西向、北东向、近东西向和近南北向。

Fracture prediction of the second member of Xujiahe Formation of Dayi structure

Based on the analysis ofthe tectonic origins and power resources ofDayi structure,the model ofthe structural evolution is summed up.2D numerical simulation of the paleotectonic stress field is applied to predict the cracking degree of the rock mass in the study area,to determine the relationship between the cracking degree of the rock mass and fracture development and to classify the level of fracture development,and then carry out the prediction of the degree of fracture development,types and occurrences of fracture.The result shows that the fractures in the second member of Xujiahe Formation are well developed in the structural high and nearby as well as the fault and nearby.Five groups of fractures are formed by the two periods of tectonic stress field,and the main extensional directions of these fractures are NW,NE,EWand NS.