Mechanics Characteristics of Rocks in the Deep Tight Carbonate Reservoir

Abstract

With regard to the difficulty in sampling the deep tight carbonate reservoir and the few related studies on the deep tight carbonate reservoir, 28 rock samples buried below 6000m in the Eastern Tarim Basin were taken as the study object. Under the confining pressure of 100MPa, the microcomputer controlled electro-hydraulic servo rock triaxial testing machine was used to conduct an experimental study on the mechanics parameters of the rock sample in laboratory. The experimental results show that the rock of the deep tight carbonate reservoir in the Eastern Tarim Basin has a higher Young modulus, a lower Poisson ratio and a higher compressive strength. According to the experimental data, the correlation between the compressive strength and the Young modulus was studied. The regression fit relationship between the compressive strength and the Young modulus was obtained by analysis and comparison, and the reliability was verified. Moreover, the relationship between the mechanics parameters and the density was clarified by discussing the law between the mechanics parameters and the physical parameters of the rock. The brittleness index of rock samples was calculated by Rickman brittleness evaluation method to establish the rock brittleness index map of the deep tight carbonate reservoir in the Eastern Tarim Basin. An extended computing was made on the fracturing index, to established the fracturing index map for fracturing evaluation. The research results provide an important basis for the fracturing design in the Eastern Tarim Basin, and have important guiding significance for the study of the mechanics parameters of the deep tight carbonate reservoir.