安塞油田坪北区低渗透储层评价

On low permeable reservoirs evaluation in Pingbei Area of Ansai Oilfield

安塞油田坪北区延长组特低渗透储层,通过这几年钻探发现主力油层为长4+52层、长61层和长62层,油层厚度达20余米,油层层数、油层厚度、原始原油地质储量和油井产量都有明显增加。从储层评价入手,系统地研究了坪北区储层沉积特征、储油层物性、孔隙结构、储油层平面分布,进行了储层分类和评价。

Through drilling exploration for several years,the extra-low permeable reservoir of Yanchang Formation in Pingbei Area of Ansai Oilfield, has discovered the main oil reservoirs are Chang4+5_2 layer,Chang61 layer and Chang6_2 layer,their pay thickness has reached over 20m,and the reservoir number,reservoir thickness,original oil in place and oil well production have been increased obviously. To start with reservoir evaluation,reservoir sedimentary characteristics,reservoir physical properties,pore texture and plane distribution of oil reservoir have been studied systematically,and reservoir is classified and evaluated.