岩性油气藏 ›› 2023, Vol. 35 ›› Issue (6): 54–62.doi: 10.12108/yxyqc.20230607

• 地质勘探 • 上一篇    下一篇

滨里海盆地东缘石炭系盐下碳酸盐岩油气藏成藏规律与勘探技术

王雪柯, 王震, 计智锋, 尹微, 姜仁, 侯珏, 张艺琼   

  1. 中国石油勘探开发研究院, 北京 100083
  • 收稿日期:2023-05-25 修回日期:2023-06-20 出版日期:2023-11-01 发布日期:2023-11-07
  • 第一作者:王雪柯(1996—),女,硕士,工程师,主要从事海外油气方面的研究工作。地址:(100083)北京市海淀区学院路20号。Email:wangxueke01@petrochina.com.cn。
  • 基金资助:
    中国石油天然气股份有限公司“海外深层油气成藏机制与勘探评价技术研究”(编号:2021DJ3102)资助

Hydrocarbon accumulation rules and exploration technologies of Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin

WANG Xueke, WANG Zhen, JI Zhifeng, YIN Wei, JIANG Ren, HOU Yu, ZHANG Yiqiong   

  1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2023-05-25 Revised:2023-06-20 Online:2023-11-01 Published:2023-11-07

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摘要： 根据地震、钻井及薄片等资料,采用地震波阻抗储层反演技术,对滨里海盆地东缘石炭系盐下碳酸盐岩储层特征、油气成藏规律进行了研究,并指出了下一步风险勘探方向。研究结果表明:①滨里海盆地东缘石炭系盐下碳酸盐岩储层可分为灰岩类、云岩类、云灰岩/灰云岩类、硅化硅质岩类等,储层孔隙度为4%~12%,渗透率通常小于1 m D,属于低—中孔、低渗孔洞-孔隙型储层。②研究区阿克若尔构造带主要发育岩性油气藏,无统一油水界面,油层呈薄层状分散分布,对比性和连续性均较差,优质储层多为高频三级层序旋回中上部的高生长率滩体及不整合面附近的岩溶储层。③采用基于层位-测井约束的初始模型的地震波阻抗储层反演技术预测碳酸盐岩薄储层,可更清晰地呈现KT-Ⅰ和KT-Ⅱ油层组储层的纵、横向展布特征。研究区有利储层主要发育在KT-Ⅱ油层组顶部的G1和G4小层。

关键词: 波阻抗储层反演, 孔洞-孔隙型储层, 滩体, 岩溶储层, 成藏规律, 岩性油气藏, 盐下碳酸盐岩, 石炭系, 滨里海盆地

Abstract: Based on seismic,drilling and thin section data,seismic wave impedance reservoir inversion technology was used to study the characteristics and hydrocarbon accumulation rules of Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin,and the next risk exploration direction was pointed out.The results show that:（1）Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin can be divided into limestones,dolomites,dolomitic limestones,calcareous dolomites,silicified siliceous rocks. The reservoir porosity is 4%-12%,and the permeability is generally less than 1 mD,belonging to lowmedium porosity and low permeability vug-pore reservoirs.（2）Lithologic reservoirs are mainly developed in Aknol structural belt in the study area,without uniform oil-water contact. The oil layers are distributed in thin layers,with poor correlation and continuity. High-quality reservoirs are mostly high growth rate beach bodies in the upper part of high-frequency third-order sequence cycles and karst reservoirs near unconformity surfaces.（3）The seismic wave impedance reservoir inversion technology based on the initial model constrained by horizon and logging was used to predict thin carbonate reservoirs,which can more clearly show the horizontal and vertical distribution characteristics of KT-Ⅰ and KT-Ⅱ reservoir groups. The favorable reservoirs in the study area are mainly developed in G1 and G4 sublayers at the top of KT-Ⅱ reservoir group.

Key words: wave impedance reservoir inversion, vug-pore reservoir, beach body, karst reservoir, accumulation rule, lithologic reservoir, subsalt carbonate, Carboniferous, Pre-Caspian Basin

中图分类号: 

  • TE122.1
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