辽河滩海地区古近系油气富集规律  

Hydrocarbon enrichment patterns of the Paleogene in tidal zones and shallow water areas of the Liaohe Depression

作　　者：王龙[1,2] 任珠琳[1,2] 李晓光[3] 唐玄[1,2] 单衍胜[1,2] 

机构地区：[1]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 [2]中国地质大学(北京)能源学院 [3]中国石油辽河油田公司勘探开发研究院

出　　处：《天然气工业》2012年第7期21-25,101-102,共5页Natural Gas Industry

基　　金：国家自然科学基金项目(编号:41102088)

摘　　要：辽河滩海地区是中国石油辽河油田公司保储增产的重要基地之一,相比辽河陆上地区,滩海地区的油气勘探开发程度较低,对油气分布规律认识不足。为此,在总结前人研究成果的基础之上,结合滩海地区特殊的地质条件,对其油气富集规律进行了研究。结果认为:该区古近系受构造和沉积演化控制,发育沙三段、沙一段和东营组3套烃源岩,分布范围广、厚度大,干酪根类型以混合型和腐殖型为主,生烃潜力巨大;油气分布规律存在地区差异,自西向东成藏主控因素依次为侧向运移、垂向运移、岩性封闭和垂向运移、断块聚集,且油气藏类型从油藏逐渐向气藏过渡;按油气分布情况可分为西部地区低压(常压)断阶式油气成藏模式、中部高压复合式油气成藏模式和东部高压断块式油气成藏模式;油气藏的分布、富集主要受生烃洼陷、输导格架和储层质量3大因素的控制。The tidal zones and shallow water areas of Liaohe are prospective for exploration,but are still under-explored and the hydrocarbon distribution has not been unveiled at present.Based on the previous study results and in combination with the specific geological conditions,the patterns of hydrocarbon enrichment are studied in this area.Three sets of sources rocks including the 3rd and 1st members of the Shahejie Formation as well as the Dongying Formation are developed in the Paleogene in the study area under control of structures and sedimentary evolution.These source rocks are featured by extensive distribution,large thickness and huge hydrocarbon-generation potential from the dominant hybrid-and humic-type kerogens.Oil and gas distribution patterns vary in different areas.The major controlling factors of hydrocarbon pooling from west to east are successively lateral migration,vertical migration,lithologic sealsing and vertical migration and accumulation in fault blocks.In addition,the types of oil/gas reservoirs change from oil reservoirs to gas reservoirs progressively from west to east.Three hydrocarbon pooling modes are recognized,namely the low(or normal) pressure fault terrace mode in the west,the high pressure compound mode in the midde,and the high pressure fault block mode in the east.The distribution and enrichment of oil and gas are mainly controlled by hydrocarbon kitchen,carrier system and reservoir quality.

关 键 词：辽河坳陷 滩海地区 古近纪 油气藏 分布规律 成藏模式 主控因素 输导格架 

分 类 号：P618.13[天文地球—矿床学]