摘要
为探讨苏北盆地溱潼凹陷古近系阜宁组二段(以下简称阜二段)不同亚段和不同岩性泥页岩的生烃潜力及其含油性,以及页岩油富集层段的分布特征。采用了地球化学分析与模拟实验相结合的研究方法,提出了适合于研究区地质特点的泥页岩含油率表征方法,确定了阜二段泥页岩的含油率和页岩油赋存状态,揭示了页岩油富集层段的分布特征。结果表明:研究区阜二段泥脖子亚段和龟背亚段的泥页岩的总含油率较高,但游离烃含量较低,吸附烃含量中等—较高,可动性较差;七尖峰亚段、四尖峰亚段和山字形亚段的含灰云页岩、灰云质页岩等的总含油率和游离烃含量均较高,吸附烃含量较低,可动性较好,而含灰云泥岩、灰云质泥岩的总含油率和吸附烃含量中等,游离烃含量相对较低,泥灰岩总含油率、游离烃和吸附烃含量均较低。研究区深凹带阜二段一、二类页岩油富集层段主要分布在四尖峰亚段和山字形亚段的中下部;斜坡带页岩油富集段不发育,局部分布有二类和三类页岩油有利层段。
The objective of this study is to delve deeper into the hydrocarbon generation potential and oil-bearing characteristics of various source rocks within the second section of the Funing Formation in Qintong Sag,Subei Basin,and to assess the degree of shale oil enrichment.Through geochemical analysis and simulation experiment research,this investigation proposes a method for characterizing shale oil content that is adapted to the geological features of the second section of the Funing Formation.The study establishes the oil content,occurrence state,and distribution characteristics of shale oil within this section.Findings indicate that the mudstone and calcium mudstone of the fourth and fifth sub-members demonstrate higher total oil content,lower free hydrocarbon content,medium to high adsorbed hydrocarbon content,and limited mobility.Meanwhile,the calcium shale,calcareous shale,and laminated marlstone of the first to third sub-members exhibit higher total oil content and free hydrocarbon content,but lower adsorbed hydrocarbon content,which enhances their mobility.The calcium mudstone and calcareous mudstone of the first to third sub-members display a moderate level of total oil content and adsorbed hydrocarbon content but relatively low free hydrocarbon content.The marlstone from these sub-members shows comparatively low levels of total oil content as well as free and adsorbed hydrocarbon contents.The study also reveals the distribution of shale oil enrichment intervals.ClassⅠand ClassⅡshale oil enrichment intervals are primarily located in the middle and lower sections of the first and second sub-members in the deep depression zone.In contrast,the slope zone features limited development of shale oil enrichment strata but contains ClassⅡand ClassⅢshale oil.
作者
余文端
高玉巧
昝灵
马晓东
余麒麟
李志鹏
张枝焕
YU Wenduan;GAO Yuqiao;ZAN Ling;MA Xiaodong;YU Qilin;LI Zhipeng;ZHANG Zhihuan(Sinopec East China Oil&Gas Company,Nanjing,Jiangsu 210019,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China)
出处
《油气藏评价与开发》
CSCD
北大核心
2024年第5期688-698,共11页
Petroleum Reservoir Evaluation and Development
基金
中国石化科技部项目“苏北盆地页岩油地质工程一体化关键技术研究”(P21112)
中国石化科技部项目“溱潼凹陷低TOC陆相页岩油勘探开发关键技术”(P23190)。
关键词
苏北盆地
溱潼凹陷
阜二段
页岩油
含油性
富集层段
Subei Basin
Qintong Sag
the second member of Funing Formation
shale oil
oil-bearing
enrichment section
