The Study On Rock Physics Experiment And Modeling For Shale Oil Reservoir

Due to the increasing shortage of oil and gas resources in the world,unconventional oil and gas exploration has been highly valued by various countries.Like shale gas,shale oil,as an important unconventional energy source,has great development potential and good prospects,and has gradually become the research focus.However,because of many characteristics of oil shale reservoirs,such as strong heterogeneity,strong anisotropy,complex mineral components,concentration and various shapes of kerogen,and poor porosity and permeability,it is difficult to directly predict reservoirs through forward and inverse modeling,so is the exploration.Therefore,it is necessary to construct petrophysical model for reservoir prediction and exploration and development.Because oil shale reservoir has strong anisotropy,and there are many causes of anisotropy,the strong anisotropy of reservoir has become the research focus of petrophysical modeling.Based on the isotropic and anisotropic seismic petrophysics theory,this paper obtains the longitudinal and transverse wave velocities and elastic modulus of oil shale reservoir with different temperatures and pressures through petrophysical experiment measurements,and studies the impact of temperature and pressure,porosity,mineral composition and organic matter on the anisotropic parameters and elastic parameters of oil shale.First of all,this makes analyses and obtains the basic physical properties of oil shale reservoirs.Considering the impact of anisotropy of clay mineral particles,including self-existent anisotropy,anisotropy caused by directional alignment and layered distribution,anisotropy caused by different maturity of organic matter,and anisotropy caused by pore distribution and cracks,this paper proposes the process for establishing petrophysical model of oil shale reservoir,and establish petrophysical correspondingly.Secondly,this paper analyzes the established model,studies the impact of porosity,organic matter,and minerals like clay particles on the elastic parameters and anisotropy of oil shale reservoir,and compares with the experimental results to verify the accuracy of the established model.Thirdly,through the actual data simulation,this paper clarifies the practicability of this model.Finally,based on the model,this paper analyzes the indicator parameters of brittle reservoir,and puts forward the brittle indicators suitable for this work area,and prove the applicability of the proposed parameters by actual data.