The Research On Remaining Oil And Development Potential Of Putaohua Layer In Xin Zhao Oilfield

With the increasing development and utilization of oil and natural gas resources,reserves of conventional porous reservoirs gradually reduced,fractured reservoir in recent years by extensive mining development,research has gradually increased,but the original uneven porosity,permeability are very low,and the fracture zone permeability is high,reservoir space development the distribution is extremely uneven,different parts of the same reservoir,reservoir performance disparity,the key problem is the development of research on the natural fractures,usually measured in the lab of oil and gas permeability is very low,but in the underground due to the crack development,communication space of various reservoir reservoir,the formation of a smooth flow system.Because Xinzhao Putaohua layer EW natural fracture,waterflood development,development direction of fracture water breakthrough early,water cut rises fast,waterflooding fracture development by poor effects and rapid decline of production and the adjustment effect is not obvious.This study takes Xinzhao Putaohua layer as an example,describe the reservoir and structure,crack and residual oil as the main line,use 3D seismic data,regional deposition,logging,coring,passive micro seismic and dynamic production data,comprehensive reservoir description and identification,conventional logging 3D geological modeling and numerical simulation of reservoir technology,law and the distribution of remaining oil distribution rule of reservoir and fracture distribution,on the basis of this,considering the crack and residual oil distribution,implement the remaining oil potential in Xinzhao oilfield pumping region,formulate reasonable development mode and adjustment of policy.Based on the collected research results of geological characteristics of Xinzhao Putaohua layer,the reservoir and fracture research as the main line,according to the division of sedimentary microfacies of the new standard,XinZhao Putaohua layer consists of 11 layers redivided into 15 sedimentary units,combined with conventional logging and seismic interpretation of passive micro cracks crack dynamic results and waterflooding reflect established logging curves to distinguish the fracture mode,find out the distribution of crack.Based on the research cracks,with the double medium 3D geological model and residual oil distribution as the main line,through the reservoir numerical simulation method,combined with dynamic and static split the remaining oil of single well layer,a comprehensive description of residual oil,residual oil distribution according to the results,optimization of the irregular encryption and injection production system the adjustment scheme,infilling wells 87,of which 84 wells,3 water wells,the recovery ratio is expected to 18.53%,the recovery rate is increased by 3.31% than the original scheme.