塔河油田缝洞型碳酸盐岩油藏可采储量计算方法探讨

TAHE OILFILD FRACTURED-CARBONATE RESERVOIR RECOVERABLE RESERVES OF CALIBRATION METHOD

塔河油田奥陶系碳酸盐岩缝洞型油藏是经过多期构造岩溶作用形成的缝洞,为储集体以缝洞单元为基本开发单元,平面上连续性极差,具底水但没有统一油水界面,具正常温度、压力系统,低饱和弱亲油性油藏.不同部位油井产能差异较大,高、低产井穿插,油井采油指数相差数百倍.根据油藏描述对塔河油田奥陶系缝洞型碳酸盐岩油藏研究及油藏开发进行动态分析,通过可采储量计算方法筛选,认为递减法较适用.随着近两年来对该类油藏的注水开发试验,油藏逐渐表现出明显水驱特征.本项目尝试用水驱法进行试算,与递减法计算结果对比,探讨试算方法的可行性及应用范围,进一步论证目前计算的可采储量是否能反映地层现阶段真实状况.

Tahe Oilfield Ordovician carbonate chimney-type reservoir is a multi-phase structural role in the formation of karst fractured reservoir for the order-seam unit as the basic unit development, poor continuity of the plane, but with the end of the water There is no uniform oil-water interface, with a normal temperature, low-pressure system hydrophobicity weak Saturated Reservoir. Well productivity in different parts of different high and low-yield wells weaved, the difference between the index of oil wells hundreds of times. According reservoir description of the Tahe Oilfietd Ordovician fractured-carbonate reservoir studies and reservoir development dynamic, recoverable reserves through the calibration method screening, decreasing by more applicable. But as the past two years that type of reservoir water flooding test the implementation of reservoir performance gradually obvious characteristics of water flooding, the report tried to water flooding method spreadsheet, and the results of decreasing contrast, on a spreadsheet The feasibility and scope of application, further proof the current demarcation of the recoverable reserves at this stage is to reflect the true state of formation.