苏北盆地溱潼凹陷西斜坡阜宁组三段油气富集规律  

The Rules of Hydrocarbon Enrichment in the 3^(rd) Member of Funing Formation on the West Steep Slope of Qinton Depression of Subei Basin

作　　者：张航国 昝灵 

机构地区：[1]中石化华东油气分公司油气开发管理部,江苏南京210019 [2]中石化华东油气分公司勘探开发研究院,江苏南京210011

出　　处：《长江大学学报（自科版）（中旬）》2016年第12期13-17,共5页Journal of Yangtze University(Nature Science Edition)

摘　　要：在烃源条件、储层特征、生储盖组合、成藏配置剖析的基础上,分析了溱潼凹陷西斜坡阜宁组三段(Ef_3)油藏分布特征,总结油气富集规律,并提出下一步有利勘探目标。研究表明,有效烃源岩的埋深和体积控制了油气富集程度,由内斜坡向外斜坡,油气充满程度逐步降低,原油成熟度也逐渐降低;长期活动断层控制汇烃范围,阜宁组二段(Ef_2)烃源主要生排烃期、Ef_3油气成藏期主要在盐城组沉积初期,因此晚期仍强烈活动的Ⅱ、Ⅲ级断层是重要导油断层,Ef_3油藏主要围绕上述断层分布;良好的构造背景是油气富集成藏的主要场所,构造高带与走滑构造带交界处是油气的主要富集带。沉积微相控制油藏类型,三角洲前缘近端的水下分流河道发育区,以构造油藏为主。西南斜坡处于三角洲前缘末端,滩坝砂发育,受到晚期北东东向断层切割,易形成砂岩上倾尖灭型油藏。构造-岩性油藏是区内重要的勘探目标。Based on the study of source rock,reservoir characteristics,source-reservoir-caprock association and configuration of hydrocarbon accumulation,the Ef_3 reservoir distribution characteristics were analyzed,the oil and gas enrichment regulations were summarized,the favorable exploration targets were put forward for the next exploration.Study indicated that the level of oil and gas enrichment were controlled by the buried depth and volume of effective source rocks,the filling extent of oil and gas and their maturity were reduced gradually from the internal steep slope to the external slope.The hydrocarbon collection range was controlled by the long active faults.The major hydrocarbon genesis and expulsion periods and the accumulation period of Ef_3 were at the initial sedimentary stage of Yancheng Formation.Therefore the faults of GradeⅡ and GradeⅢ with intense activity at the late stage were important oil conducting faults.The reservoirs of Ef_3 were distributed around faults described above.The favorable structural background was the major area of hydrocarbon accumulation,the cross section of the upper belt and strike-slip structural belt was the major area of oil and gas enrichment.The reservoir type was controlled by the sedimentary microfacies and structural reservoirs were mainly developed in the areas of underwater distributive channel in the near side of delta front.While the beach bar sand was developed at the terminal of delta front on the southwest steep slope,it was incised by fault of NEE strike,which was easy to form a up dip pinch-out reservoir,therefore structural-lithologic reservoirs are the major exploration targets in the studied area.

关 键 词：溱潼凹陷 西斜坡 阜宁组三段 长期活动断层 构造-岩性油藏 

分 类 号：TE122.1[石油与天然气工程—油气勘探]