渤海西部下古生界碳酸盐岩潜山储层成因机理及模式  

The Differential Genetic Mechanism and Model of the Lower Paleozoic Carbonate Buried Hill Reservoirs in the Western Bohai Sea

作　　者：华晓莉 李慧勇 许鹏 孙哲 夏宇 Hua Xiaoli;Li Huiyong;Xu Peng;Sun Zhe;Xia Yu(Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《地球科学》2025年第2期494-503,共10页Earth Science

基　　金：渤海油田上产4000万吨新领域勘探关键技术(No.CNOOC-KJ 135 ZDXM 36 TJ 08 TJ).

摘　　要：渤海西部下古生界碳酸盐岩潜山钻探证实寻找厚层优质储层是潜山勘探的关键.根据钻井揭示下古生界储层特征和分布存在较大的差异,反应了储层成因存在本质差别.基于断裂发育及构造演化分析,首次建立渤海西部剥蚀残丘型和剥蚀断块型两类碳酸盐岩潜山,在明确潜山类型划分的基础上,开展了两大类潜山储层差异成因机制分析.结果表明,残丘型潜山形成岩溶体储层,在微古地貌控制下的岩溶古水系坡度越大的区带,岩溶体储层发育程度越大,形成枝蔓式储层发育模式;断块型潜山形成缝溶体储层,在多期构造应力叠加区,有效裂缝更为发育,储层厚度更大,形成裂隙式储层发育模式.明确渤海西部不同潜山类型碳酸盐岩储层差异成因及模式,对下一步碳酸盐岩区油气勘探具有一定的指导意义.Drilling of carbonate buried hills in the Lower Paleozoic in the western Bohai Sea has confirmed that finding thick and high-quality reservoirs is the key to buried hill exploration.According to drilling,there are great differences in the characteristics and distribution of the Lower Paleozoic reservoirs,which reflects the essential differences in the genesis of the reservoirs.Based on the analysis of fault development and tectonic evolution,two types of carbonate buried hills in the western Bohai Sea,denudation residual hill type and denudation fault block type,are established for the first time in this paper.The results show that the residual hill type buried hills form karst reservoirs.The more developed the karst paleo-water system is under the control of micropaleomorphology,the greater the degree of development of karst reservoirs,and the development pattern of dendritic reservoirs is formed;Fault-block buried hills form fracture-melt reservoirs.In the multi-phase tectonic stress superposition area,effective fractures are more developed and the reservoir thickness is larger,forming a fractured reservoir development model.Identifying the different genesis and patterns of carbonate reservoirs of different buried hill types in the western Bohai Sea has certain guiding significance for the next step of hydrocarbon exploration in carbonate rock areas.

关 键 词：渤海西部 碳酸盐岩潜山 差异成因 古水系 构造应力 石油地质 

分 类 号：P618.13[天文地球—矿床学]