In-situ stress field inverse analysis technology study of low permeability reservoir based on multi-well constraint
In-situ stress field inversion is to find a model or parameter, which can fit practical data as much as possible. According to the fundamental equations of elastic mechanics, the optimization constraint model based on the least square method is established. The optimization method of in-situ stress field of low permeability reservoirs is proposed. Depending on sequential unconstrained minimization technique, the problem of multi-objective constraint is transformed into unconstrained optimization problem by adding penalty function, and numerical model related with finite element calculation is derived. Reasonable objective function is selected to solve minimum value by applying optimization method to adjust and search design parameters, thus boundary loads are obtained. By use of the inversion boundary loads, finite element forward solution is carried out, so in-situ stress field is determined. According to in-site stress size and direction in typical well for GaoYou W8 fault block of SuBei Basin as constraint, the area stress field is calculated. The example shows that the method is reliable and has high precise, and overcomes disadvantages of regression method and boundary adjusting method. Therefore, the optimization method put forward in this paper can effectively solve the inversion problem of in-situ stress field for low permeability reservoir.
Yan Xiangzhen Yang Xiujuan
College of Storage &Transportation and Architectural Engineering, China University ofPetroleum, Dong College of Storage &Transportation and Architectural Engineering, China University of Petroleum, Don
国际会议
The Fifth International Symposium on In-situ Rock Stress(第五届国际岩石应力研讨会)
北京
英文
453-456
2010-08-25（万方平台首次上网日期，不代表论文的发表时间）