海相油气地质2025，Vol.30Issue(3)：265-276,12.DOI:10.3969/j.issn.1672-9854.2025.03.007
南美北部巴巴多斯增生楔生物气成藏特征及富集规律
Biogenic gas accumulation conditions and enrichment rules in Barbados accretionary wedge,north of South America
摘要
Abstract
In recent years,many large-scale biogenic gas reservoirs have been discovered in the world,which has be-come one of the hotspots of natural gas exploration.Biogenic gas reservoirs are mainly distributed in passive continental margin basin,foreland basin,craton basin,fore-arc basin,and accretionary wedge,etc.The conditions of biogenic gas accumulation in accretionary wedge are complicated due to the intense tectonic activity,and there is a lack of systematic understanding of biogenic gas enrichment rules and main controlling factors in accretionary wedge.Based on 2D seismic,well data,we discuss the biogenic gas accumulation conditions in Barbados accretionary wedge,north of South America and define the hydrocarbon migration and accumulation model,and furtherly reveal the law of oil and gas enrichment and point out the favorable exploration direction.The results show that:(1)From west to east,the inner(western)depres-sion,the central uplift,and the outer(eastern)thrust zone develop successively,and the inner zone develops the large sag.(2)The thick mudstone in the large sag provides sufficient biogenic gas source.Large channel complexes,channel-le-vee complexes,channel-lobe complexes,and lobes are mainly developed in western depression,which has a good rela-tionship with traps.Early high relief thrust-faulted anticline is located in the convergence area of oil and gas,which is con-ducive to efficient biogenic gas accumulation.(3)Since the Pliocene,under the compression of the Caribbean Plate,the central uplift belt has widely developed mud diapirs,forming numerous mud diapir-related structural traps.The continu-ous activity of these mud diapirs persists to the present day.The activity of late-stage mud diapirs has led to the destruc-tion of biogenic gas reservoirs,resulting in the failure of all drilling attempts on the flanks of the mud diapirs.So late pres-ervation conditions are the key factors for biogenic gas accumulation.(4)The model of Biogenic gas self-generation and self-storage or lower-generation and upper-storage is established.The western depression has favorable conditions for the formation of biogenic gas reservoirs and is a favorable exploration direction.关键词
生物气/深水沉积/保存条件/成藏模式/增生楔/南美Key words
biogenic gas/deep-water sedimentation/preservation condition/accumulation model/accretionary wedge/South America分类
石油、天然气工程引用本文复制引用
陶维祥,程涛,陈亮..南美北部巴巴多斯增生楔生物气成藏特征及富集规律[J].海相油气地质,2025,30(3):265-276,12.基金项目
本文受中国海洋石油集团有限公司"十四五"重大科技项目"'两岸一带'重点盆地油气富集规律和成藏差异性研究"(编号:KJGG2022-0901)资助 （编号:KJGG2022-0901）
