济阳坳陷沾化凹陷桩南断裂带储层精细划分对比方法研究

摘要

Stratigraphic accurate correlation and subdivision are very difficult because of the complicated faults in Zhuangnan fault zone of Zhanhua sag,Jiyang depression.According to the formers' research,a method of stratigraphic accurate correlation and subdivision in fault zone was first proposed.The method mainly included step-by-step subdivision,partition correlation and unified all-region.For step-by-step subdivision,the subdivision was from oil layer group to sand group,then to single layer,and later to single sandbody in vertical,and the selection of auxiliary marker formation and correlation marker of adjacent wells was the key; for partition correlation,the distribution of correlation marker of adjacent wells was certain and overlapping,multi-marker control principle was used for partition correlation,and finally unified all-region correlation was carried out.The innovation points of the method included the discovery and application of mudstone auxiliary marker formation,re-definition and classification of correlation marker of adjacent wells systematically,and the first introduction on multi-marker integrated overlapping application correlation method.Finally,the method applied on stratigraphic correlation and subdivision in Zhuangnan fault zone was effective,and solved the problem including the simple method and the lower accuracy of correlation in the old correlation scheme,and improved the stratigraphic accurate correlation and subdivision in similar complex fault-block areas.%济阳坳陷沾化凹陷桩南断裂带断裂复杂,储层精细划分对比难度极大.在前人研究成果的基础上,首次提出断裂带储层细分对比方法,“逐级细分、分区对比、全区统一”是该方法的3个主要方面.逐级细分强调的是纵向上由油层组→砂层组→小层→单砂体的细分对比,选择好的辅助标志层和邻井对比标志是做好逐级细分的关键；分区对比则强调平面上利用邻井对比标志均有一定的分布范围且存在重叠的特点,采用多标志控制原则进行分区对比,最终实现全区范围的对比统一.该方法的创新之处在于泥岩辅助标志层的发现及应用、重新确定邻井对比标志及其系统归类、首次提出多标志综合叠加应用的对比方法.最后,该方法在桩南断裂带储层细分对比中取得了很好的效果,有效解决了原对比方案中方法较单一、对比精度低等问题,有助于类似的复杂断块区储层精细划分对比工作.