论文部分内容阅读
安棚深层系是典型的低孔特低渗透砂砾岩油气藏,其天然裂缝发育,影响油藏的井网部署和注水开发效果。根据地表露头、岩心和薄片分析,安棚深层系主要为高角度构造剪切裂缝。根据定向取心和成像测井资料,研究区以近东西向裂缝最发育,其次是北东向和北西向裂缝,不同部位不同方向裂缝的发育程度存在一定的差异。根据水压致裂和校正后的井径崩落资料,研究区现今地应力优势方位为50°～60°。在北东—南西方向现今地应力影响下,研究区北东向裂缝的张开度大,连通性好,渗透率高,为主渗流方向。因此在研究区下一步的井网调整中,可将目前的五点法面积注采井网转化为沿北东向主渗流裂缝的行列式注水开发井网,油藏数值模拟预测结果表明,调整后第5a采出程度为11.7%,单井累积产油量为1.4×104t,在原油价格(不含税)为2640元/t时,评价期内的内部收益率(税后)为24.68%,具有较好的经济效益。
Anpeng deep system is a typical low-porosity and low-permeability conglomerate oil and gas reservoirs, and its natural fractures are developed, affecting well layout and water injection development of the reservoir. According to the surface outcrops, core and thin slice analysis, Anpe deep structure is mainly made of high-angle shear cracks. According to the directional coring and imaging logging data, the most developed east-west fractures in the study area are followed by the north-east and north-west fractures, and there are some differences in the development of fractures in different directions at different locations. According to the data of hydraulic fracturing and caliper caving, the present azimuthal stress azimuth of the study area is between 50 ° and 60 °. Under the current stress in North-East-South-West direction, the north-east fractures in the study area have large openness, good connectivity and high permeability, which are the main seepage directions. Therefore, in the next adjustment of the well pattern in the study area, the current five-point area injection-production well pattern can be transformed into a well-type water injection development well pattern along the north-east main flow fracture. The numerical simulation of the reservoir prediction shows that adjustment After the first 5 a recovery of 11.7%, single well cumulative production of 1.4 × 104t, the crude oil price (excluding tax) is 2640 yuan / t, the evaluation period of internal rate of return (after tax) was 24.68% , With good economic benefits.