异常高压对储层厚度划分的影响

Effect of Abnormal High Pressure on Subdivision of Reservoir Thickness

油层厚度是油田开发的重要参数之一,是后续的油层对比、水淹层解释以及射孔方案编制的基础,是正确认识油层分布状况和计算地质储量的依据。在北二西西部地区进行三次加密和萨尔图油层聚驱井方案调整厚度划分中,有部分井出现电测曲线异常,主要表现在微电极曲线、声波、密度、自然电位、深浅三侧向以及微球聚焦曲线电性特征不匹配,降低了厚度划分精度和准确度,分析其原因主要是由储层的异常高压引起的。为此,就如何利用测井曲线判别异常高压层,并能准确地划分出油层厚度做了初步探讨。

Oil layers thickness, one of important parameters for oilfield development, is the basis of successive comparison of oil layers, interpretation of water flooded zone and perforation program. It is also the foundation to clearly understand oil layer distribution and to calculate geologic reserves. During the thickness division of tertiary infill drilling program for the west of Beierqu and the polymer flooding program for Saertu oilfield, partial wells has abnormal electric curves, mainly displaying micro-electrical curve, acoustic wave, density and natural potential, deep and shallow three sideways as well as un-matching characteristic of micro-ball focusing curve, which reduce the accuracy of thickness division. The abnormal high pressure zone has caused that. So this paper makes a primary study on accurate division of thickness and identification of abnormal high pressure with the logging curve.