Research On The Geological Modeling And The Development Adjustment In Low Permeability Reservoir

In this paper,low permeability reservoir has many practical problems,on the base of predecessors'work,the paper takes Liu.Maoyuan Gen271 District in Changqing Oil Field for example,by analyzing geological characteristics of the study area,layer correlation,development situation analysis,the rational development policy research,the potential area and adjustment programs.The main research results are as following:1.By applying the matching of successions and using the principle of the same thick strata comparison,identifying typical logs characteristics of the target layer in low permeability reservoir.Taking these logs characteristics to subdivide the target layer,getting three sublayers and building the target layer structrure of the region,which achieving fine target layer of the region.2.By applying well logging and core analysis data,we build logging interpretation models of the study region.The model include:shale content explanation model,porosity explanation model,permeability explanation model,oil saturation explanation model,According to these models,we identify the minimum standards of effective thickness of the study layers.3.Using geological modeling method,applying Sequential Gaussian simulation method to do delicate reservoir description and get the three dimensional modeling,sandstone distribution modeling,porosity modeling,permeability modeling and oil saturation modeling of the main layer.Analyzing modeling results and the initial well loggings,the two data are basically the same.Calculating the reservoir reserves and providing the source of data of later study.4.Conducting a detailed analysis of the development status of the study area,taking reservoir engineering method and identifying the possibility of advance water injection technique.We get reasonable advance injection time,limited reasonable advance injection time,reasonable formation pressure maintenance level,reasonable water injection pressure,rational injection-production well spacing,the minimum allowable well bore pressure,rational oil production and liquid production at present well spacing density.5.Taking reservoir simulation to study the remaining oil distribution in study area.Taking the fracture development direction into the consideration of the upscaling of the grid.By history matching of the whole region and single well,we get the basic parameters of the study area.Analyzing the plane and vertical remaining oil distribution,remaining oil reserves,degree of reserve recovery.Summarizing the adjustment principle of potential area and providing a few suggestions of program adjustment:infilling area,conversion well and shut in.