Development model of compound buried-hill reservoirs in the Yingmai 32 area of Tabei and its significance for exploration
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摘要: 勘探开发实践表明塔北英买32潜山区发育一类特殊的潜山油藏类型———碳酸盐岩-砂岩复合潜山油藏。文章通过对部分复合潜山油藏的描述和英买32地区构造、沉积演化的分析,指出沿潜山面发生的多期削蚀、超覆作用是形成复合潜山的根本原因,加里东中晚期、海西-印支期两次大型不整合的发育是形成复合潜山的基础。根据地层削蚀、超覆作用的不同,将复合潜山分为削蚀型和超覆型2类。根据砂岩与碳酸盐岩接触关系的不同,2类复合潜山又分别可划分为3种模式:削蚀型潜山可分为覆盖式、尖灭式、断堑式;超覆型潜山可分为覆盖式、尖灭式、沟谷式。塔北地区复合潜山普遍发育,加强储层顶面刻画,落实复合潜山圈闭,是实现滚动扩边的关键所在。Abstract: A special type of buried-hill reservoirs,which is compounded by both carbonates and sandstones, has been discovered in the Yingmai 32 area of Tabei (North Tarim).This paper describes part of these reser-voirs and analyzes structures and sedimentary history of the Yingmai 32 area.We suggest that the key reason for the generation of such reservoirs is that multiple-episode truncations and overlaps have happened along the unconformity surface of basement rocks.The two enormous unconformities that developed during the Middle to the Late Caledonian period and Hercynian to Indo-China period set up the foundation for the build-ing-up of these compound reservoirs.The reservoirs could be divided into two types:truncation type and o-verlap type.The truncation type can be further divided into three different models:overlap,pinch-out and graben models,while the overlap type includes three sub-models:overlay,pinch-out and gully models.Such compound buried-hill reservoirs are common in Tabei.Thus we should make more efforts to describe the top surface of all connected reservoirs instead of carbonates alone,which would significantly contribute to expan-sion of hydrocarbon exploration.
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