渤海湾盆地沧东凹陷沙河街组一段沉积相特征及成藏模式  

Characteristics of sedimentary facies and oil accumulation model in first member of Shahejie Formation CangRong Depression,Bohai Bay Basin

作　　者：赵少泽 李勇[1] 牟连刚[3] 吴雪松[3] 杨朋[3] 袁雪花[3] 官全胜[3] 徐盈娇 ZHAO Shaoze;LI Yong;MU Liangang;WU Xuesong;YANG Peng;YUAN Xuehua;GUAN Quansheng;XU Yingjiao(School of Geosciences,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Postdoctoral Research Station of Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China;PetroChina Dagang Oilfield Company,Tianjin 300280,China;School of Geosciences,Hebei GEO University,Shijiazhuang,Hebei 050031,China)

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]成都理工大学地质学博士后科研流动站,四川成都610059 [3]中国石油大港油田公司,天津300280 [4]河北地质大学地球科学学院,河北石家庄050031

出　　处：《东北石油大学学报》2021年第6期1-14,I0001,共15页Journal of Northeast Petroleum University

基　　金：中国石油大港油田分公司产学研项目(DGYT-2018-JS-289);成都理工大学油气藏地质及开发工程国家重点实验室自由探索基金项目(SKL2019015);成都理工大学油气藏地质及开发工程国家重点实验室开放基金项目(PLC2020013)。

摘　　要：渤海湾盆地沧东凹陷古近系沙河街组一段(沙一段)具有低熟油勘探潜力。利用岩心、薄片、测录井、地震、地球化学等资料,分析沙一段沉积相特征及控制因素、暗色泥页岩生烃潜力,建立沙一段成藏模式。结果表明:沧东凹陷沙一段沉积相类型为湖泊和辫状河三角洲,南部为辫状河三角洲—湖泊相,北部为湖泊相,沉积相类型与空间展布受构造活动和海侵的影响。沙一段暗色泥页岩具有较好的生烃潜力,海侵可以促进高有机质丰度烃源岩的形成和低熟泥页岩的早期生烃。沧东次凹沙一段多形成自生自储型岩性或构造—岩性低熟油藏,南皮次凹以下生上储型断层低熟油藏为主。该结果为沧东凹陷沙一段低熟油勘探提供参考。Shahejie Formation(Es;)in Cangdong Depression has the exploration potential of immature oil,Bohai Bay Basin.Using core data,thin section data,logging data,seismic data,and geochemical test data,the Es;sedimentary facies characteristic and its control factors as well as the hydrocarbon generation potential of dark mudstone/shale are analyzed,and the immature oil accumulation model of Es;is established.The result shows that Es;sedimentary facies types including lake and braided river delta,the braided delta and lake facies are in the south,and the lake facies in the north.The sedimentary facies types and distribution characteristics are affected by tectonic activity and marine transgression.The Es;mudstone/shale possesses good hydrocarbon generation potential,while marine transgression promotes the formation of mudstone/shale with high organic matter abundance and the early hydrocarbon generation of immature mudstone/shale.Lithologic or structure-lithologic immature oil reservoirs are mainly formed in the Es;in Cangdong Sub-depression,while the lower-generation upper-storage type faulted immature oil reservoirs are mainly formed in the Nanpi Sub-depression.The results can provide an important reference for immature oil exploration in the Es;in Cangdong Depression.

关 键 词：渤海湾盆地 沧东凹陷 沙一段 沉积相 成藏模式 海侵 低熟油 

分 类 号：TE122.1[石油与天然气工程—油气勘探]