断陷盆地古近系油气成藏过程有序性研究——以渤南洼陷为例  

Study on the Order of Paleogene Oil and Gas Accumulation Process in Fault Basin:A Case Study of Bonan Sag

作　　者：伍松柏 WU Songbai(Shengli Oilfield Exploration and Development Research Institute,SINOPEC,Dongying,Shandong 257015,China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《海洋石油》2025年第1期1-7,共7页Offshore Oil

基　　金：国家科技重大专项课题“渤海湾盆地含油气系统成藏机理与剩余资源分布”(2024ZD1400101)。

摘　　要：陆相断陷盆地普遍发育多套烃源岩和多套含油层系,油气成藏过程十分复杂,对成藏过程认识的提升将有助于加快该类盆地勘探进程,并提高勘探成效。该研究针对渤南洼陷油气差异分布的现象,综合应用前人成果、地质及地化资料、包裹体数据,系统剖析渤南洼陷油气生成、运移、充注和聚集过程,明确不同构造带油气分布特征及其成藏过程有序性。研究表明:除渤南深洼带沙四段有两期油气充注外,其它区带和层系仅有一期油气充注,渤南深洼带充注时间最早,始于东营组末期(距今28~25 Ma),而北部陡坡带油气充注较晚,主要为明化镇组中期以来(距今3~0 Ma)发生。明确了有效烃源岩分布及演化、输导体系类型及圈源空间距离等要素的有序变化控制了成藏过程的有序性,进而控制了油气差异分布,该认识和结论对断陷盆地的勘探选区和选带具有重要指导意义。Many sets of source rocks and oil-bearing series are widely developed in continental fault basins,and the process of oil and gas accumulation is very complex.Improving the understanding of the process of oil and gas accumulation will help accelerate the process of oil and gas exploration and improve the effectiveness of exploration in such basins.This study focuses on the phenomenon of differential distribution of oil and gas in Bonan Depression.By comprehensively applying previous study results,geological and geochemical data,and inclusion data,the generation,migration,filling,and accumulation of oil and gas in Bonan Depression are systematically analyzed,and the distribution characteristics of oil and gas in different structural zones and their sequential reservoir formation processes are clarified.The study shows that except for the two stages of oil and gas filling in the Sha-4 member of Bonan deep depression zone,there is only one stage of oil and gas filling in other zones and layers.Bonan deep depression zone is the first to be filled,starting from Dongying Formation period(28~25 Ma ago),while the northern steep slope zone is filled with oil and gas relatively late,mainly since the middle stage of the Minghuazhen Formation(3~0 Ma ago).This study finds out that the orderly change of the key elements,including effective source rock distribution and evolution,the type of the transport system and the space distance of the trap-source,controls the order of the reservoir forming process and thus controls the differential distribution of oil and gas.This understanding and conclusion has important guiding significance for the selection of exploration block in fault basins.

关 键 词：包裹体 油气充注 油气成藏过程 有序性 渤南洼陷 断陷盆地 

分 类 号：P618.13[天文地球—矿床学]