岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 133–144.doi: 10.12108/yxyqc.20240513

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地庆城地区三叠系长7段烃源岩特征及控藏作用

王子昕1,2,3, 柳广弟3, 袁光杰1,2, 杨恒林1,2, 付利1,2, 王元1,2, 陈刚1,2, 张恒1,2   

  1. 1. 中国石油集团工程技术研究院有限公司, 北京 102206;
    2. 油气钻完井技术国家工程研究中心, 北京 102206;
    3. 中国石油大学(北京)地球科学学院, 北京 102249
  • 收稿日期:2023-04-19 修回日期:2023-05-22 出版日期:2024-09-01 发布日期:2024-09-04
  • 第一作者:王子昕（1997—），男，硕士，工程师，主要从事油气藏形成机理与分布规律及非常规油气工程方面的研究工作。地址：（102206）北京市昌平区黄河街5号院中国石油工程技术研究院有限公司。Email：wzxdr@cnpc.com.cn。
  • 通信作者: 柳广弟（1961—），男，博士，教授，主要从事油气藏形成与分布等方面的教学与科研工作。Email：lgd@cup.edu.cn。
  • 基金资助:
    中国石油天然气集团有限公司油气和新能源项目“新能源-工程技术跟踪评价”（编号：2023YQX415）资助。

Characteristics and reservoir control of source rocks of Triassic Chang 7 member in Qingcheng area，Ordos Basin

WANG Zixin1,2,3, LIU Guangdi3, YUAN Guangjie1,2, YANG Henglin1,2, FU Li1,2, WANG Yuan1,2, CHEN Gang1,2, ZHANG Heng1,2   

  1. 1. CNPC Engineering Technology R & D Company Limited, Beijing 102206, China;
    2. National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Beijing 102206, China;
    3. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2023-04-19 Revised:2023-05-22 Online:2024-09-01 Published:2024-09-04

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摘要： 鄂尔多斯盆地三叠系长7段是页岩油的重点研究领域。通过总有机碳测定、氯仿抽提、岩石热解、XRD全岩矿物分析、扫描电镜观察等，对鄂尔多斯盆地庆城地区三叠系长7段烃源岩特征进行了分析，并利用多元回归线性法建立了有机碳与测井曲线的三维电测模型，明确了烃源岩的空间展布特征及其的控藏作用。研究结果表明：①鄂尔多斯盆地庆城地区三叠系长71、长72和长73小层泥页岩样品TOC平均值分别为5.01%，6.04%和6.76%，氯仿沥青“A”的平均值分别为0.63%，0.67%和0.73%，整体有机质类型以Ⅱ1型和Ⅱ2型为主，处于成熟—高成熟阶段，含油性与可动性均较好，达到较好—极好烃源岩级别。②研究区泥页岩样品主要由石英长石与黏土矿物组成，孔隙类型主要为原生粒间孔、晶间孔及有机质收缩缝，但各样品的孔径分布不同。③研究区烃源岩TOC下限为1.50%，庆城地区附近长72小层、庆城与环县地区附近长73小层为主要有效烃源岩发育区。④有效烃源岩的TOC含量及其空间展布特征影响了页岩油藏的含油性，其中TOC含量直接决定了产油量的高低。距离生烃中心越近越有利于油气聚集。

关键词: 页岩油, 多元回归, 有机碳预测, 烃源岩展布, 成熟—高成熟阶段, 长7段, 三叠系, 庆城地区, 鄂尔多斯盆地

Abstract: The Chang 7 member of Triassic in Ordos Basin is a key research area for shale oil. Through the determination of total organic carbon，chloroform extraction，rock pyrolysis，XRD whole rock mineral analysis，and scanning electron microscopy observation，the characteristics of source rocks of Triassic Chang 7 member in Qingcheng area of Ordos Basin were analyzed. A three-dimensional electrical logging model of organic carbon and logging curves was established by using multiple regression linear method，clarifying the spatial distribution characteristics of the source rocks and their reservoir control effects. The results show that：（1）The average TOC values of shale samples from Chang 71，Chang 72 and Chang 73 submembers in Qingcheng area of Ordos Basin are 5.01%， 6.04% and 6.76%，respectively，and the average values of chloroform bitumen “A” are 0.63%，0.67% and 0.73%，respectively. The overall organic matter types are mainly type Ⅱ1 and type Ⅱ2，which are in mature to high-mature stage. The oil content and mobility are good，reaching a good to excellent source rock level.（2）The shale samples are mainly composed of quartz feldspar and clay minerals. The pore types are mainly primary intergranular pores，intercrystalline pores and constricted fissures in organic matters，but the pore size distribution of each sample is different.（3）The lower limit of TOC in source rocks in the study area is 1.50%. The 72 submember near Qingcheng area and the 73 submember near Qingcheng and Huanxian areas are the main effective source rock development areas.（4）The TOC content and spatial distribution characteristics of effective source rocks affect the oil content of shale reservoirs，and the TOC content directly determines the level of oil production.

Key words: shale oil, multiple regression, organic carbon prediction, source rock distribution, mature to high-mature stage, Chang 7 member, Triassic, Qingcheng area, Ordos Basin

中图分类号: 

  • TE122.2
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