S 油藏产能评价及开发方式优化设计

S 油藏属于复杂断块和局部异常高压油藏，在对其地质特征以及现有10 口试油测试和试采井共23 井次的测试资料系统分析基础上，运用层序地层学、试井边界探测分析、产能评价等多种油藏工程方法对S 油藏P1、P2、P3 组等3 套含油层系的压力系统、原油性质、测试产能、米采油指数和采油强度等开发设计所需技术政策界限进行了评价，认为：P1 组为一套正常压力系统、普通黑油为主、测试折算日产油能力在20 t 左右、米采油指数较高的弹性水压驱动油藏；P2、P3 组为异常高压、轻质挥发油为主、测试折算日产油在4050 t 左右、米采油指数较高的天然能量驱动油藏。结合S 油藏地质条件，综合运用单井经济极限控制储量、经济极限井网密度、以及经济最佳井网密度等计算方法确定了S 油藏合理井网密度和井距，运用复杂断块油藏建模及数值模拟方法对注水开采S 区块P1 油藏、天然能量间歇开采P2 和P3 油藏的开发方案进行了优化设计，提出最佳开发方案为部署直井14 口井，水平井3 口，预测15 年后方案累产油93.48104 t，采出程度分别达到22.53%、8.19% 和12.95%。

Productivity Evaluation and Optimization of ExploitationMethods of S Reservoir

The S reservoir located in the west coast of Africa is characterized by complex blocks and its local block has anabnormal high pressure. There is the need to optimize the reservoir’s exploitation program rationally. Based on S reservoirgeological features and the test data analysis system of the existed 10 test wells and producing test wells of 23 wells，using sequencestratigraphy，well test analysis of the boundary detection，capacity evaluation and other reservoir engineering methods，we evaluated the exploitation policy limits of the pressure systems，crude oil properties，test production，per meter productivityindex，the oil intensity of production and other design technologies of the S reservoir’s P1，P2，P3 group of its three oil-bearingstrata. We concluded that P1 group is a set of normal pressure system，ordinary black oil-based，20 t or so for the test conversiondaily oil production capacity，a flexible hydraulic drive reservoir of higher per meter productivity index. P2，P3 groupare sets of abnormally high pressure system，light volatile oil-based，4050 t or so for test converted oil production capacity，natural energy-drive reservoir of higher per meter productivity index. With S reservoir’s geological conditions，the integratedapplication of the controlling reserves of economic limit of single well，the density of the economic limit of wells and other calculationmethods to determine S reservoir’s rational well spacing and density of well pattern. Applicing oil reservoir modelingand numerical simulation of complex fault-block，we optimized the exploitation programs of P1 reservoir of water flooding，and P2 and P3 reservoir of natural energy interval drive，and proposed the best exploitation program for the deployment of 14vertical wells，3 horizontal wells. The accumulated oil production will have reached 93.48104 t after 15 years according tothis program，recovery percent will have reached 22.53%，8.19% and 12.95% respectively.