Numerical simulation of palaeotectonic stress field of Yingcheng Fm in Gulong - Xujiaweizi area: prediction and comparative study of tectoclase development area
Wei Chunguang,Lei Maosheng, Wan Tianfeng,Jie Weiqiang (China University of Geosciences,Beijing 100083, China; Exploration Branch Company of Daqing Oilfield Limited Company,PetroChina,Daqing,Heilongjiang 163000,China)
Fractured reservoir is one of the main oil and gas reservoirs in Gulong - Xujiaweizi area of Daqing oilfield , and Yingcheng Fm is the main deep gas target in this area. The tectonic event that has influenced the tec-tonization of Yingcheng Fm in this area is believed to have occurred after the deposition of the 1 st member of Qingshankou Fm during early Late Cretaceous. The tectonic differential stress value at this stage has been measured by using the quartz dislocation density method, and the tectonic stress field at this stage in the study area has been numerically simulated by using the elastic-plastic incremental method. The simulation shows that the maximum principal stress in the area was in NNE - SSW direction in early Late Cretaceous, and the tectonic stress values was characterized, as a whole, by nearly meridional and zonal distribution. The tectoclase development zones of Yingcheng Fm in Gulong - Xujiaweizi area are predicted to be located in the western part of Gulong area and the western and northern parts of Xujiaweizi area, and they would be the favorable oil and gas accumulation areas.
【CateGory Index】： P618.13