海相油气地质2025，Vol.30Issue(3)：255-264,10.DOI:10.3969/j.issn.1672-9854.2025.03.006
川南泸州地区志留系石牛栏组礁滩体发育特征及勘探意义
Development characteristics and exploration significance of reef-shoal body of the Silurian Shiniulan Formation in Luzhou area,southern Sichuan Basin
摘要
Abstract
The recent exploration discoveries in Luzhou area indicate that the reef-shoal body of the Silurian Shiniulan Formation has certain potential for reservoir formation.A systematic study based on drilling,outcrop,and 3D seismic data is conducted to explore the development characteristics and exploration significance of the reef-shoal body of Shiniulan Formation.The results indicate that:(1)Reef/bioclastic limestone mainly develops at the top of the first member of Shiniulan Formation,with a thickness ranging from 6 to 40 meters,characterized by moderate-strong amplitude and medium-high frequency seismic reflection character.(2)Affected by the ancient uplift in central Sichuan,the first member of the Shiniulan Formation is developed at mixed tidal flats and intra-platform depressions,forming contiguous tidal edge reefs and shoals on the high terrain of the mixed tidal flats.At some high belts of the intra-platform depressions,intra-platform reefs/bioclastic shoals are developed.(3)The reservoir formation model of Shiniulan Formation is characterized by"near-source hydrocarbon generation,fault-mediated migration,lower-generation and upper-reservoir storage,and composite accumulation".The high-quality hydrocarbon source rocks of the Longmaxi Formation,the reef-shoal reservoir of the first member of Shiniulan Formation,the mudstone of the second member of Shiniulan Formation and the overlying strata form a good source rock-reservoir-caprock combination.The complex network fault system provides conditions for oil and gas migration,and the oil and gas filling period matches the trap formation period(P-K),laying the foundation for large-scale oil and gas accumulation.The Shiniulan Formation reef-shoal body is an important oil and gas exploration field worthy of attention.关键词
礁灰岩/地震响应/岩溶作用/油气成藏/石牛栏组/四川盆地Key words
reef limestone/seismic response/karstification/hydrocarbon accumulation/Shiniulan Formation/Sichuan Basin分类
石油、天然气工程引用本文复制引用
周刚,钟原,张本健,乔艳萍,戴鑫,张自力,兰才俊,豆霜,徐多..川南泸州地区志留系石牛栏组礁滩体发育特征及勘探意义[J].海相油气地质,2025,30(3):255-264,10.基金项目
本文受国家自然科学基金"扬子西北缘早古生代海相盆地多幕次构造-沉积转换及其成烃成储响应"(编号:U2344209)、中国石油天然气股份有限公司重大科技专项"海相碳酸盐岩油气规模增储上产与勘探开发技术研究"(编号:2023ZZ16)共同资助 （编号:U2344209）
