龙岗须家河组须六段裂缝形成演化及分布预测

Formation evolution and distribution prediction in Xujiahe group Xu-6 member of Longgang area

利用岩心观察、地震、钻井等资料,结合川中地区构造运动背景,以龙岗地区须六段断裂构造形迹为基础,研究裂缝形成演化模式,结合岩石力学与构造地质学理论,使用数值模拟分析技术,预测该区的古构造应力场及须六段底部的裂缝发育与分布情况。结果表明:研究区裂缝主要形成于燕山运动早期和晚期,共形成了两期5组;裂缝的发育主要受断裂和构造部位的影响,分布极不均匀。该研究成果与实际生产情况匹配较好,对下一步勘探开发部署有一定的指导意义。

Based on the fracture structural features of Xu-6 member in Longgang area, using the data such as core observation, seism and drilling and combined with the tectonic movement background in central Sichuan, this paper studied the fracture forma- tion evolutionary model. Meanwhile, combined with the rock mechanics and theories of structural geology and using numerical sim- ulation analysis technique, this paper also predicted the paleotectonic stress field in this area and the fracture development and dis- tribution in the bottom area of Xu-6 member. The results showed that the fractures in the study area were mainly formed in the ear- ly and late period of the Yanshanian orogeny. Two periods five groups of fractures were formed in total. The fracture developments were mainly affected by the fault and tectonic position which led to the extremely uneven distribution. Matching well with the actu- al production conditions, the study results had certain guiding significance for the further exploration and development.