辽河油田锦99块扇三角洲前缘储层隔夹层成因与分布

陆相储层隔夹层是形成油藏内流体流动非均质的主要原因之一,也是控制厚油层复杂水淹形式的主要地质因素。通过对辽河油田锦99块扇三角洲前缘储层隔夹层进行研究,认为在沉积作用、成岩作用的控制下,研究区内形成了泥质、物性、钙质三类隔夹层,其岩-电识别特征与分布规律均存在明显的差别。泥质夹层主要分布于厚层水下分流河道砂叠置区、水道侧缘区以及邻近砂岩尖灭区;物性夹层分布较杂乱,常分布于物性较差的区域;钙质夹层主要分布于砂厚较大、原生孔隙发育的岩相带以及Ⅱ级边界断层附近。隔夹层对油藏内剩余油分布具有重要影响,需要综合断裂构造、沉积相、成岩相等多种地质因素进行预测。

Genesis and distribution of the fan delta front barrier interlayers in the Jin-99 block of the Liaohe Oil Field

The barrier interlayers are interpreted as the main factors to form the heterogeneity of fluid flows in the continental reservoirs and to control complicated waterlogged regimes in the thick oil reservoirs.The deposition and diagenesis led to the formation of three types of barrier interlayers： mudstone barrier interlayers,physical barrier interlayers and carbonate barrier interlayers.The mudstone barrier interlayers are observed mainly in the thick subaqueous distributary channel sandstones,channel margins and adjacent sandstone pinchout areas.The physical barrier interlayers appear commonly in the areas with poor porosity and permeability.The carbonate barrier interlayers occur dominantly in the sandstones with developed primary pores or along the second-order boundary faults.The residural oil distribution in oil reservoirs tends to be controlled not only by the above-mentioned barrier interlayers but also by other geological factors such as faulting structures,sedimentary facies and diagenetic facies.