摘要
对苏北盆地重点凹陷的70口钻井采集395件样品进行实验分析,并结合前人资料详细研究了苏北盆地古近系古新统阜宁组阜二段、阜四段两套烃源岩地化特征、岩矿特征、储集空间类型及储集性能,在重点油井解剖的基础上,探讨了页岩油的富集机理。苏北盆地阜宁组有机碳普遍大于1.0%,有机质类型较好,整体处于低熟-成熟阶段,具备良好的生油基础;微裂缝、孔隙较发育,具有一定的储集条件,阜二段泥页岩整体黏土矿物含量低于35%,脆性矿物含量大于50%,有利于页岩油的开采。通过对重点凹陷典型页岩油藏的两口井的数据解剖,认为页岩油藏受高有机质丰度的成熟泥页岩、脆性矿物含量、裂缝发育程度、异常高压等因素控制。苏北盆地的金湖凹陷、高邮凹陷、海安凹陷和盐城凹陷的深凹带是泥页岩油气勘探和开发的有利区带。
395 samples collected from 70 wells in the major depressions of the Subei Basin are analyzed in this paper.Combined with the previous data analyzed,we systematically studied the geochemical and lithological characteristics,accumulation space types and their distribution patterns as well as reservoir physical properties in addition to the hydrocarbon source rock of the F2 and the F4 Member of the Paleogene Funing Formation in the Basin.Based on the case studies for typical wells and oil shows,the occurrence and accumulation mechanisms of shale oil is deeply discussed.The results reveal that the average organic carbon content of the two members is over 1.0%,dominated by the type I-II in a matured stage,that found the basis for the formation of shale oil.Many kinds of micropores and micro cracks are well developed.Clay content of the Member F2 is usually lower than 35%and the content of brittle minerals is over 50%,which is in favor of shale oil mining.The study of the two well cases in the typical shale reservoir reveals that the formation of shale oil reservoir mainly depends on the existence of mature shale with high abundance of organic matter and brittle minerals,well developed fractures and abnormal high pressure.The major depressional centers of the Jinhu Sag,Gaoyou Sag,Haian Sag and Yancheng Sag in the North Jiangsu Basin are favorable zones for shale gas exploration and mining.
作者
芮晓庆
周圆圆
李志明
张庆珍
RUI Xiaoqing;ZHOU Yuanyuan;LI Zhiming;ZHANG Qingzhen(Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi 214126,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Wuxi 214126,China;Key Laboratory of Petroleum Accumulation Mechanisms,SINOPEC,Wuxi 214126,China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2020年第6期133-145,共13页
Marine Geology & Quaternary Geology
基金
国家科技重大专项项目(2017ZX05049-001)。
关键词
地球化学特征
岩矿特征
储集性能
页岩油
苏北盆地
阜宁组
geochemical characteristics
rock characteristics
reservoir performance
shale oil
the Subei basin
the Funing Formation
