Stress Sensitivity of Naturally Fractured-porous Reservoir with Dual-porosity

Abstract

Abstract Compared with porous sandstone reservoirs, the complicated fractured (fractured-porous) reservoir is of high stress sensibility. This results in not only the difficulties of calculating transport properties of actual formations, but also problems on formation protection. The stress sensibility of the reservoir results mainly from that of fractures in the reservoir. Therefore, the topologic properties of both natural and many man-made fractures without any grinding, taking from both actual reservoirs and crops on the ground, are investigated and analyzed with elastic and elastic/plastic micro-contacting theory. Then the stress sensibility of fractures is numerically modeled on computer and tested in lab. Some conclusions different from that of publications are obtained. Consequently, a method of analyzing and evaluating stress sensibility of dual-porosity reservoir with natural fractures is made on the basis of the investigation. This can thus be applied to the calculation of in-situ transport property for naturally fractured reservior and provide basic data for the formation protection of porous fractured reservoirs. P. 295