Analysis Of The Shale Gas Reservoir Fracturing Cracks Based On The Acoustic Finite Element Method

At present,the conventional energy can't meet the growing demand for energy,developing unconventional energy is imperative,people pay more and more attention to the shale gas.Because the shale gas reservoir belongs to the discontinuous gas reservoir,the fracture of the shale gas reservoir affects the distribution of shale gas reservoir directly,they could provide the flow of storage space and a good way for shale gas,effective reservoir reconstruction volume will improve the shale gas production.According to statistics,China's shale gas reserves is the first in the world,in view of the domestic shale gas reservoir physical and mechanical properties,the analysis of the micro cracks in shale gas reservoir,improving the reservoir volume has become a key problem needed to resolved.Shale fractured reservoir recognition and the study of the mechanical properties of rocks are very important,because people often use the method of acoustic logging to study the shale gas reservoir,and use micro seismic monitoring recognition to analyze shale gas reservoir fracture usually,so it is necessary to study the sound waves rules in the propagation of shale gas reservoir micro fracture and the sound waves in reservoir in different crack propagation.This paper main discuss the following several parts:(1)This paper studies the shale gas reservoir rock mechanics properties,analyzes the field shale gas well logging data,calculate the rock mechanics parameters of the shale gas reservoir;(2)By monitoring the hydraulic fracturing fracture process of the shale gas well and analyzing the micro seismic monitoring data,it gets the size and distribution approximately;(3)By using the acoustic finite element theory and finite element software ANSYS,this paper study the numerical simulation of the propagation of acoustic wave in shale gas reservoir,conduct a study about the acoustic wave velocity in the shale gas reservoir which influenced by the shale formation of young's modulus and Poisson ratio;(4)Studied the influence of different crack on wave propagation in shale gas reservoir,studied the propagation of acoustic wave formation when the parameters of the fracture in the shale gas reservoir changes,such as crack length,width.