黄骅坳陷埕海斜坡古近系油气成藏条件及主控因素  

Hydrocarbon accumulation conditions and main controlling factors of Paleogene in Chenghai slope,Huanghua Depression

作　　者：郭美洁 时保宏 董雄英[2] 李昊东 何川[2] GUO Meijie;SHI Baohong;DONG Xiongying;LI Haodong;HE Chuan(School of Earth Sciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China;Research Institute of Exploration and Development,PetroChina Dagang Oilfield Company,Tianjin 300280,China)

机构地区：[1]西安石油大学地球科学与工程学院,西安710065 [2]中国石油大港油田分公司勘探开发研究院,天津300280

出　　处：《岩性油气藏》2022年第3期82-92,共11页Lithologic Reservoirs

基　　金：中国石油科技重大专项“多类型斜坡区油气成藏与增储建产技术研究”(编号:2018E-11-01);西安石油大学研究生创新与实践能力培养项目“黄骅坳陷埕海斜坡古近系油气成藏条件及主控因素”(编号:YCS21212098)联合资助。

摘　　要：通过原油特征、薄片鉴定、扫描电镜、储层物性等资料,对黄骅坳陷埕海斜坡古近系油气富集规律和主控因素进行了研究。研究结果表明:(1)埕海斜坡古近系发育沙一段和沙三段2套主力烃源岩,有机质类型以Ⅱ;型和Ⅱ;型为主,油源条件充足;孔隙类型以粒间溶蚀孔、粒内溶蚀孔、铸模孔为主;纵向上发育3个优质孔隙带,压差排烃为油气运移提供动力,断层与储层的不同组合形式形成多样的断层-岩性圈闭。(2)斜坡高部位油气成藏主控因素是砂体和不整合面侧向输导体系;斜坡中部的油气成藏主控因素是断层;斜坡低部位距油源近,供烃量充足,储层成为其成藏的关键因素。(3)斜坡低部位是油藏富集程度的主控因素,斜坡高部位的储层条件最好,但供烃量不足;斜坡中部的断层较多,断裂活动可为油气聚集提供良好的运移和保存条件;斜坡低部位供烃量充足,但储层条件较差,故斜坡中部是油气资源最丰富的区块。Based on the data of crude oil characteristics,thin section identification,scanning electron microscope and reservoir physical properties,the hydrocarbon accumulation law and main controlling factors of Paleogene in Chenghai slope of Huanghua Depression were studied. The results show that:(1)Two sets of main source rocks are developed in the first and third members of Paleogene in Chenghai slope,the organic matters are mainly type Ⅱ;and type Ⅱ;,with sufficient oil sources. The reservoir pores are mainly intergranular dissolved pores,intragranular dissolved pores and moldic pores. Three high-quality pore zones are developed vertically. Differential pressure hydrocarbon expulsion provides power for oil and gas migration,and different combinations of faults and reservoirs form a variety of fault lithologic traps.(2)The main controlling factors of hydrocarbon accumulation in the high part of the slope are sand bodies and unconformity surface as oil and gas migration channel,and the main controlling factor of hydrocarbon accumulation in the middle part of the slope is fault. The low part of the slope is close to the oil source and has sufficient hydrocarbon supply,so the reservoir has become the key factor for its accumulation.(3)The low part of the slope is the main controlling factor for hydrocarbon enrichment. The reservoir conditions in the high part of the slope are the best,but the hydrocarbon supply is insufficient. There are many faults in the middle part of the slope,and the fault activity can provide good migration and preservation conditions for hydrocarbon accumulation. The low part of the slope has sufficient hydrocarbon supply,but the reservoir conditions are poor,so the middle part of the slope is the block with the most abundant oil and gas resources.

关 键 词：成藏条件 富集规律 斜坡部位 古近系 埕海斜坡 黄骅坳陷 

分 类 号：TE122[石油与天然气工程—油气勘探] P618.130[天文地球—矿床学]