Lithofacies Identification Of Shale And Modeling Method Reasearch

As a big progress in the last ten years in horizontal drilling and hydraulic fracture stimulation technologies,the gas of unconventional reservoirs can be developed from fine pore and permeable layer.The position for fracturing is strongly linked to the mineral composition of rocks.The natural gas content in reservoir is related to organic matter content,measured by total organic carbon(TOC).Lithofacies geology research could describe the distribution of organic and mineral of rock and then made progress in design of horizontal trajectories and hydraulic fracture stimulation strategies.Begin with the basic rock physics model,aim at unconventional reservoirs,this paper discusses anisotropic rock physics model.And anisotropic rock physic model is been established in North Shaanxi Slope;Then,we use optimization log interpretation method to obtain the mineral composition with core XRD data and definite the ranges of organic and brittleness shale by mineral composition and TOC content;when the ranges been confirmed,new lithofacies would been identificated by combinating the ranges of organic and brittleness shale;after applying neural network technology to the whole work area's facies identification we use three-dimensional model to analysis the distribution of organic and brittle shales which for the design of horizontal well trajectories and hydraulic fracture stimulation strategies.