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通过裂缝形成时期古应力场数值模拟,预测铜城断裂带阜二段储层裂缝的产状;利用岩心声速实验以及微地震监测技术确定井点现今地应力方位;结合压裂资料计算井点现今地应力;通过确定岩石力学参数并建立有限元模型进行现今应力场数值模拟;借助于裂缝产状以及现今应力场数值模拟结果,预测储层中天然裂缝的开启压力和开启次序。结果表明,铜城断裂带阜二段现今水平最大主应力为北东东向;在注水过程开发中,北东东向裂缝优先开启,南东东向裂缝后开启;裂缝的开启压力随裂缝走向与水平最大主应力之间的夹角增大而增大;裂缝埋深与开启压力同样具有较好正相关性,在构造高部位(1 850~2 350 m)裂缝的开启压力在25~50 MPa之间,在构造低部位(3 300~4 000 m)裂缝的开启压力在45~75 MPa之间;通过计算储层的实际破裂压力,提出在不同区块采用不同的注水压力,以保证油气井的高产与稳产。
Through the numerical simulation of the paleocastal stress field in the period of fracture formation, the occurrence of fractures in the reservoir of the second member of the Fucheng fault zone in the Tongcheng fault zone is predicted. The current stress direction of the wellsite is determined by the sound velocity of the core and the microseismic monitoring technique. Current stress; predicting the cracking pressure and opening sequence of natural fractures in reservoir by means of determining the rock mechanics parameters and establishing the finite element model; The results show that the maximum principal stress of the second member of Fucheng fault zone in the Tongcheng fault zone is northeastward and eastward. During the development of waterflooding process, the northeastern eastward fracture preferentially opens and the easterly eastward fracture opens, and the cracking cracking pressure increases with fracture direction And the maximum horizontal principal stress increases with the increase; crack depth and opening pressure also have a good positive correlation, in the high position (1 850 ~ 2 350 m) crack cracking pressure in the 25 ~ 50 MPa, the opening pressure of fractures in the lower part of the structure (3 300 ~ 4 000 m) is between 45 and 75 MPa. By calculating the actual fracture pressure of the reservoir, it is proposed that different injection pressures be applied in different blocks to ensure Oil and gas wells of high yield and stable production.