Study on evolution law of geostress field in Jin58 crypto area of Dongsheng Gas Field
This paper takes advantage of petrel integration to establish a four-dimensional pressure field model in the Jin-58 infilled area.On this basis,a four-dimensional stress field model in the study area is established through bi-directional coupling of the finite element method.Based on the pumping program,an artificial fracture propagation model based on the four-dimensional ground stress model is established to simulate the fracture propagation law of the whole interval of key Wells.The stress field model is modified according to the well data of fracture monitoring as a means of detection and verification.The results show that the in-situ stress in Jin58 well area is mainly affected by lithology,structure and fault.The in-situ stress in mudstone development area shows a high value,and the in-situ stress in sandstone development area varies with lithology.The maximum horizontal principal stress of the model is 64～72MPa.The average formation pressure of well groups decreased by 10～15MPa,corresponding to the decrease of ground stress by 8～10MPa.The research results provide model support for the subsequent construction and deployment of new well production capacity in the increasing infilling area and have certain guiding significance.
Encryption adjustmentFour-dimensional pressure fieldFour-dimensional stress fieldDetection and verification meansModel support
万方数据
维普
