Rock Mechanical Properties And Compressibility Of Shale Reservoirs In Baojing Area, Hunan Province

Shale gas has been included in the strategy for the development of oil and gas resources in China.Since the very low matrix permeability shale reservoir,it need be fractured to form a large-scale industrial production.Unlike conventional reservoir fracturing,the volume of shale reservoir fracturing requirement forms complex fracture network and determines the ability of compressional shale reservoir forming seam net,and the compressibility can be effective in the process of hydraulic fracturing fracture properties.Flakes using shale mineral X-ray diffraction analysis,electron microscope scanning,mercury injection experiment and test results,to have a preliminary understanding of reservoir property,can be pressed for the next step research provides the foundation parameters.The static rock mechanics parameters of samples are obtained by the test of MTS pressure machine and GCTS pressure machine.Then,the dynamic rock mechanics parameters of samples are got by the use of a push around company Panametrics 5058 rock acoustic meter test and the PAC-?is used to monitor the wave velocity.On the basis of summarizing part of brittleness evaluation methods both in domestic and abroad,the comprehensive evaluation method of studying the brittle shale can be proposed by combining the experimental data and theoretical research method.Finally,using the theory of grey correlation evaluate the compressibility,considering the rock mechanics parameters,the difference of ground stress,the natural fracture density and mineral components,the value of grey correlation degree can be got the pressure coefficient.According to the characteristics of the reservoir parameters,can be pressed sex can be divided into three levels: first level compressional coefficient of 0.1-0.1,this kind of reservoir for hydraulic fracturing effect is not good;The second level can be compressional coefficient of 0.3-0.6,hydraulic fracturing can obtain good effect;The third level can be compressional coefficient is 0.6-1,the reservoir is of high quality can be fracturing layer.