The distribution characteristics of interlayers in multi-stage distributary channel reservoirs of deltaic plains and their influence on remaining oil distribution: a case study of the H6 reservoir of B Gas Field in Huangyan area，Xihu Sag
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摘要:
储层中隔夹层发育模式对于储量动用程度及剩余油气分布有着重要的影响，针对B气田H6储层气藏动静储量矛盾、采出程度低的难题，以B气田H6储层河道3为例，通过对岩芯壁芯、测井和实验测试等动静态资料的综合分析，明确隔夹层类别、层次结构及成因，建立研究区内不同类型隔夹层的测井识别标准，在此基础上分析隔夹层的空间展布规律。研究结果显示：B气田H6储层河道3主要发育泥质和物性2种类型隔夹层，其中以泥质隔夹层为主，主要受到高频沉积旋回的影响，而物性隔夹层的分布相对稀疏，多受沉积作用控制，且主要集中在河床底部的滞留沉积区。H6储层河道3隔夹层根据其层次结构，可以分为2个级别：单砂体间夹层和单砂体内夹层，单砂体间隔夹层在局部区域分布相对稳定，连续性相对较好，主要控制剩余油气分布；单砂体内夹层厚度相对较小，分布较为分散，封挡效果较差。该研究成果可为H6储层河道3后续调整挖潜提供依据。
Abstract:The interlayer development mode in the reservoir has an important impact on the degree of the reserve production level and the distribution of remaining oil and gas. A thorough investigation on the core, logging, test, and analysis was conducted for the H6 reservoir of B Gas Field in the East China Sea to explain the complexity and the discrepancy between dynamic and static reserves and the low recovery efficiency. Through testing and analysis, the types, characteristics, and origins of interlayers were clarified, for which the logging identification standards of different types of interlayers in the study area were established and the spatial development mode of interlayers is described. Results reveal that interlayers in H6 reservoir are mostly lithological (argillaceous layer) type, and their genesis is mainly regulated by high-frequency cycles. Other less distributed interlayers are cause by physical property discrepancy and formed during sedimentation at the bottom of the river bed. The occurrence of interlayers in the H6 reservoir was seen in two types: inter-sandbody and intra-sandbody. The inter-sandbody interlayers have good continuity locally and distributed widely, playing a good role in obstructing the local fluid movement. However, the intra-sandbody interlayers are thin and sporadically scattered, thus have a limited blocking ability. This study offered a basis for future oilfield exploration in the H6 reservoir.
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