墨西哥湾西北部古近纪早期(62~48 Ma)源汇体系与沉积格局变迁  

Changes of Source-to-sink Systems and Sedimentary Patterns in the Early Paleogene(62-48 Ma)of the Northwestern Gulf of Mexico

作　　者：侯云超 樊太亮[2,3] 王宏语[2,3] 李一凡[2,3] 黄兴文 龙盛芳 HOU YunChao;FAN TaiLiang;WANG HongYu;LI YiFan;HUANG XingWen;LONG ShengFang(Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company,Xi′an 710018,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism of the Ministry of Education,China University of Geosciences(Beijing),Beijing 100083,China;CNOOC Research Institute,Beijing 100028,China;PetroChina Bohai Drilling Engineering Company,Tianjin 300457,China)

机构地区：[1]中国石油长庆油田分公司勘探开发研究院,西安710018 [2]中国地质大学(北京)能源学院,北京100083 [3]中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京100083 [4]中海油研究总院,北京100028 [5]中国石油渤海钻探工程有限公司,天津300457

出　　处：《沉积学报》2020年第6期1272-1283,共12页Acta Sedimentologica Sinica

基　　金：中国科学院战略先导项目(XDA14010201-02);国家自然科学基金项目(41802155)。

摘　　要：受埋深和复杂盐构造影响,深水Wilcox沉积研究难度大,开展大尺度源汇体系分析对理解墨西哥湾Wilcox沉积格局具有实际意义。通过对古科罗拉多(简称C)水系与古格兰德河(简称RG)水系相关研究成果的系统梳理,结合地震、钻井、岩芯与岩矿等资料,分析了墨西哥湾西北部深水沉积格局的演变特征及其储层意义。C水系和RG水系形成两个不同的源汇系统,源汇系统构成要素之间既有联系,也存在明显差异,物源区和搬运区各要素的时空变化决定了两大水系沉积物供给能力和深水沉积格局的变迁。古新世Wilcox沉积期,C水系沉积物供给强,在浅水陆架和深水盆地形成大规模三角洲和富砂海底扇体系,墨西哥湾西部Perdido带主要受该物源控制。始新世Wilcox沉积期,C水系物源供给减弱,海底扇规模减小,扇体轴部向东迁移,而RG水系沉积物供给增强,在陆架区形成高砂地比的三角洲体系,砂质沉积物进一步越过陆架形成西部海底扇,Perdido带浊积砂岩主要受该物源控制。广泛发育的浊积砂岩储层表明墨西哥海域Perdido带始新世Wilcox组具有较大的勘探潜力。Due to the influence of a deep buried depth and complex salt structure,it is difficult to study the deep-water Wilcox deposition.Therefore,it is necessary to conduct large-scale source-to-sink system analysis to understand the changes of the Wilcox sedimentary pattern in the northwestern gulf of Mexico.In this paper,the evolution characteristics of the deep water sedimentary pattern and its significance for the deep water Wilcox reservoir are analyzed by systematically combing the related research achievements of the paleo-Colorado and paleo-Rio Grande fluvial systems with seismic,drilling,core,and mineral composition analysis data.The paleo-Colorado and paleo-Rio Grande fluvial systems form two different source-to-sink systems,and their units not only show certain internal connections,but also have obvious differences.The spatio-temporal variation of the units in the source and transport areas determine the variation of the sediment supply capacity and the change of the deep-water sedimentary pattern.During the Paleocene Wilcox sedimentary period,the paleo-Colorado fluvial system had a strong sediment supply capacity and formed a large-scale delta and sand-rich submarine fan system in the shallow water shelf and deep water basin.The Perdido fold belt in the western gulf of Mexico was mainly controlled by this fluvial system.In the Eocene Wilcox sedimentary period,the water discharge of the paleo-Colorado fluvial system and the scale of the submarine fan decreased,and the axis of the fan body migrated eastward.By contrast,the sediment supply of the paleo-Rio Grande fluvial system increased significantly,and a large delta system with high net to gross ratios developed in the continental shelf area.The sandy sediments further crossed the continental shelf to form the western submarine fan,and the turbidite in the Perdido fold belt mainly came from this system.The widely developed turbidite sandstone reservoirs indicate that the Eocene Wilcox Formation in the Perdido fold belt of Mexico has great exploration potenti

关 键 词：Perdido褶皱带 Wilcox储层 深水沉积 源汇体系 墨西哥湾 

分 类 号：P534.61[天文地球—古生物学与地层学] P618.13[天文地球—地质学]