渤海辽中凹陷南洼走滑断裂带成藏模式  

Accumulation model of strike-slip fault zone in southern sub-sag of Liaozhong sag, Bohai sea

作　　者：吴奎 余一欣[1] 张江涛 WU Kui;YU Yixin;ZHANG Jiangtao(College of Geoscience,China University of Petroleum,Beijing,Beijing 102249,China;CNOOC Research Institute Ltd.,Beijing 100028,China;CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中海油研究总院有限责任公司,北京100028 [3]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《中国海上油气》2023年第6期13-22,共10页China Offshore Oil and Gas

摘　　要：基于辽中凹陷南洼油田实钻等资料,对处于同一构造带的东部走滑断裂带和西部走滑断裂油气成藏特征进行对比研究,结合两个断裂带的构造特征等分析油气成藏差异性的主控因素,最后总结成藏模式。结果表明:①东部走滑断裂带主力含油层系为新近系馆陶组,为重质原油,油品性质较差;西部走滑断裂带油层主要集中分布在东营组,整体为中—轻质原油,油品性质较好。②东部走滑断裂带长期活动且晚期构造活动强度较大,油气突破东二下亚段厚层泥岩沿断裂运移至浅层储盖组合较好的馆细段富集成藏,馆细段组合表现为“薄泥盖厚砂”,相对开放的地质环境,后期水洗氧化和生物降解致使油品性质较差;西部走滑断裂带为早断早衰型断裂,消亡于古近系,晚期活动强度弱,油气主要被封存于东二下亚段厚层泥岩下伏的东三段,“厚泥盖薄砂”优质储盖组合呈相对封闭的地质环境,油品性质较好。③东部走滑断裂带属于“早期成藏—中期调整—晚期富集”的油浅层气成藏模式;西部走滑断裂带属于“早期充注—中期富集—深部成藏”成藏模式。本项研究成果对该区的油气勘探具有指导作用。Based on the actual drilling data of the southern sub-sag oilfield in Liaozhong sag,the hydrocarbon accumulation characteristics of the eastern and western strike-slip fault zones in the same structural belt are compared and studied,and the main controlling factors of hydrocarbon accumulation differences are analyzed in combination with the structural characteristics of the two fault zones,and accumulation model is summarized.The results show that:①The main oil-bearing series of the eastern strike-slip fault zone is the Neogene Guantao Formation,which contains heavy crude oil with poor oil quality;the oil reservoirs in the western strike-slip fault zone are mainly distributed in the Dongying Formation,which generally contains medium-light crude oil with good oil quality.②The eastern strike-slip fault zone has been active for a long time and has strong late tectonic activity in the late stage.Oil and gas broke through the thick mudstone of the lower part of the east second member and migrated along the fault to the Guanxi section of the shallow reservoir-cap assemblage.The Guanxi section is characterized by thin mud cap and thick sand.The relatively open geological environment and the later water washing oxidation and biodegradation resulted in poor oil quality.The western strike-slip fault zone is an early fault and early aging fault,which died out in the Paleogene,and has weak tectonic in the late stage.Oil and gas are mainly trapped in the east third section under the thick mudstone of the lower section of the east second member.The high-quality reservoir-cap assemblage of thick mud and thin sand'has a relatively closed geological environment,and the oil quality is good.③The eastern strike-slip fault zone belongs to the shallow oil and gas accumulation model of early accumulation-middle adjustment-late enrichment.The western strike-slip fault zone belongs to the accumulation model of early filling-middle enrichment-deep accumulation.The research results can provide guidance for oil and gas exploration in

关 键 词：渤海 辽中凹陷南洼 郯庐断裂 走滑断裂带 成藏差异 成藏模式 

分 类 号：TE122.1[石油与天然气工程—油气勘探]