构造应力场数值模拟在哈密凹陷四道沟地区T_2~k储层裂缝预测中的应用

APPLICATION OF NUMERICAL SIMULATION OF TECTONIC STRESS FIELD IN FRACTURE PREDICTION OF T_2~k OIL RESSERVIOR IN SHIDAOGOU_AREA,HAMI DEPRESSIO

哈密凹陷位于新疆东部三大板块的结合部位,内部构造复杂。本文利用数值分析方法,模拟了凹陷内四道沟构造Tk2层的构造应力场。结果表明:该层古构造应力分布不均匀,可划分出2个应力集中区、1个应力异常区,其余为正常应力区;根据岩石破裂试验以及构造应力模拟计算结果,制定了该区裂缝的定量评价标准;依据该标准,预测评价出该区的裂缝发育的Ⅱ级区1个、Ⅲ级区2个,其余为裂缝不发育区。

Hami Depression is located in the combining site of the three plates in the eastern part of Xinjiang autonomous area, and its internal structure is complex. In this paper, the tectonic stress filed of the layer T^k_2 in Sidaogou area within the Depression was simulated by using numerical analysis methods, and the results indicate that the tectonic stress in this layer is bad-distributed. It can be divided into two stress concentrating areas, one stress abnormal area and the rest is stress normal area. According to rock failure tests and the output of the tectonic stress simulation, a quantitative assessment criterion has been established for the fracture in this region. And basing on this criterion, we predicted and evaluated that one area is fracture well-developed in Ⅱ grade, two area is fracture developed areas in Ⅲ grade, and the rest is not fracture developed area.