海洋地质前沿2026，Vol.42Issue(2)：28-39,12.DOI:10.16028/j.1009-2722.2025.038
渤海海域西南部规模型隐伏对冲构造带的形成与油气勘探意义
Formation and petroleum exploration significance of large-scale subsurface thrust belt in the southwestern Bohai Sea
摘要
Abstract
The southwestern Bohai Sea in North China features relatively complete buried-hill strata and superior hydrocarbon source conditions,and is adjacent to the Qikou Sag and the southwestern subsag of the Bozhong Sag.However,exploration in the shallow buried hills in the Cretaceous,Jurassic,and Upper Paleozoic strata is not sat-isfactory,while the Lower Paleozoic carbonate rocks hosting relatively well-developed reservoirs,remain largely unexplored due to the coverage by thick Mesozoic and Upper Paleozoic strata.To further clarify the distribution patterns of the Lower Paleozoic strata in the study area,a large-scale concealed thrust belt was recognized and characterized based on recent 3D seismic data and structural evolution analysis.The thrust belt exhibits a unique buried hill stratigraphic structure with an absence of Upper Paleozoic strata.The formation of the thrust belt was controlled by the coupling of multiple factors,including persistent Indosinian compressive stress,gravitational ef-fects,and the presence of plastic mudstone at the base of the Cambrian.The structural high background formed by the thrust belt laid the foundation for trap development,provided a window for the Lower Paleozoic carbonates to undergo Indosinian weathering and leaching,and facilitated the development of fractured reservoirs.The discov-ery of the thrust belt has challenged the traditional view that reservoir formation in the Lower Paleozoic of the study area is difficult.It provides strong guidance for hydrocarbon exploration in the buried hills of the Shanan Sag,which has been confirmed by drilling,and offers valuable insights for buried hill exploration in the western Bohai Sea.关键词
渤海西南部/对冲带/印支期/下古生界/潜山Key words
southwestern Bohai Sea/thrust belt/Indosinian/Lower Paleozoic/buried-hill分类
海洋科学引用本文复制引用
吴庆勋,张如才,高文博,李飞,郭颖,任健..渤海海域西南部规模型隐伏对冲构造带的形成与油气勘探意义[J].海洋地质前沿,2026,42(2):28-39,12.基金项目
中国海洋石油集团有限公司重大科技项目"渤海大中型天然气田形成条件、富集规律与勘探方向研究"(KJZH-2024-2107) （KJZH-2024-2107）
