渤海湾盆地渤中凹陷西南环古生界沉积微相及其对岩溶储集层的控制作用

发布时间：2018-09-11 18:42

【摘要】：渤海湾盆地渤中凹陷西南环古生界深埋碳酸盐岩潜山天然气获得重大突破,钻井资料揭示该地区碳酸盐岩岩溶储集层具有很强的非均质性。由于沉积相是岩溶储集层发育的主控因素之一,因此文中根据岩心和薄片资料、测井相、微量元素和古生物特征等多种手段综合分析沉积相特征。结果表明,研究区现存奥陶系纵向上表现为1个较为完整的海退—海进序列,主要发育开阔台地和局限台地2种沉积亚相,并可进一步划分为台内滩、滩间、潮下带和潮间带4种沉积微相。台内滩和潮下带微相横向分布连续稳定,水动力条件强,形成的储集层早期溶孔发育,且这2种沉积环境里发育的碳酸盐岩较纯净,经后期风化淋滤形成的岩溶储集层厚度大、质量好,因此是有利的岩溶储集层发育相带。该研究明确了研究区台内滩及潮下带的发育特征,对下一步油气勘探具有一定的指导意义。
[Abstract]:A great breakthrough has been made in the deep buried carbonate buried hill natural gas in the Paleozoic of the southwest ring of Bozhong depression in the Bohai Bay basin. The drilling data reveal that the karst reservoir of carbonate rock in this area has strong heterogeneity. Since sedimentary facies are one of the main controlling factors for the development of karst reservoirs, the sedimentary facies characteristics are comprehensively analyzed according to the core and sheet data, logging facies, trace elements and paleontological characteristics. The results show that the existing Ordovician in the study area is a relatively complete regressive and transgressive sequence, mainly developed two sedimentary subfacies, open platform and limited platform, and can be further divided into two subfacies, I. e., the subfacies within the platform and between the banks. There are four sedimentary microfacies in subtidal zone and intertidal zone. The horizontal distribution of microfacies in the flat and subtidal zone is continuous and stable, the hydrodynamic condition is strong, the early dissolution pore is developed in the reservoir formation, and the carbonate rock developed in these two sedimentary environments is relatively pure, and the thickness of the karst reservoir formed by the late weathering and leaching is large. Because of its good quality, it is a favorable facies zone for karst reservoir development. This study makes clear the development characteristics of subtidal zone and beach in the study area, and has certain guiding significance for oil and gas exploration in the next step.
【作者单位】：中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项(编号:2011ZX05023-002,2011ZX05023-006-002)资助~~
【分类号】：P618.13

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