利用测井资料计算非均质砾岩油藏单井控制地质储量

针对克拉玛依油田七中、七东区克上组非均质砾岩油藏参数平面上的分区性和差异性,以及油田非均匀井网对砾岩油藏的控制和相应储量分布的匹配关系,利用井点面积权衡法确定单井控制含油面积,分井区建立了砾岩油藏储量参数解释图版及其电阻率、孔隙度、含油饱和度、自然电位减小系数的有效厚度下限标准,以及单井油层有效厚度变化和损失的边界信息收边处理,实现了利用测井资料对非均质砾岩油藏储量分区性和差异性的控制和分析计算。通过该区七中、七东1、七东2等3个井区112个井点单井控制地质储量的分析计算,充分发挥了测井方法多、精度高、分辨性强、测量连续等优点,有效地克服了使用平均值计算储量参数带来的“平滑效应”所产生的问题,使各种非地质因素的影响减小到最低程度,提高了非均质砾岩油藏储量计算的精度,为该区非均质砾岩油藏单井控制开采和预测剩余油分布提供了基础数据。

Computation for Single Well Controlled Geological Reserves of Heterogeneous Conglomerate Reservoir with Log Data

In view of the division and difference of heterogeneous conglomerate reservoir on the plane of parameters of Qizhong and Qidong blocks in Karamay Oilfield, as well as the matching relation between the control of oilfield nonhomogeneous well pattern on conglomerate reservoir and relevant reserves distribution, this paper determines single well controlled oil-bearing area with well-point areal weigh method, making the explanation chart of reserve parameters of conglomerate reservoir and establishing the effective thickness lower limit standard of the resistivity, porosity, oil saturation, and self-potential reduction factor in different blocks. It also deals with the boundary information about the variation and loss of the effective pay thickness in single wells. So the division and difference of reserves in heterogeneous conglomerate reservoir can be controlled, calculated and analyzed with log data. Based on the analysis and calculation of the single well controlled geological reserves in 112 well points of three blocks including Qizhong, Qidong-1, and Qidong-2, etc., it reveals that the method of using logging data to calculate parameters of heterogeneous conglomerate reservoir features in multiple logging methods, high accuracy, good discernibility, and continuous measurement, effectively solving the problems originated from smoothing effect caused by applying average value. It is favorable for reducing the influence of various non-geological factors, improving the accuracy of reserve calculation of heterogeneous conglomerate reservoir, and supplying basic data for the single well controlled exploitation of heterogeneous conglomerate reservoir and the prediction of remaining oil distribution in these blocks.