古地理学报 ›› 2022, Vol. 24 ›› Issue (2): 292-307. doi: 10.7605/gdlxb.2022.02.021

• 碳酸盐岩专题 • 上一篇    下一篇

川中地区中上寒武统洗象池组颗粒滩储集层特征及主控因素*

邓成昆1,2, 黎霆1,2, 杨伟强1,2, 张玺华3, 程忠贞1,2, 陈浩如4, 诸丹诚1,2, 胡力文1,2, 邹华耀1,2   

  1. 1 中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;
    2 中国石油大学(北京)地球科学学院,北京 102249;
    3 中国石油西南油气田分公司勘探开发研究院,四川成都 610041;
    4 成都理工大学沉积地质研究院,四川成都 610059
  • 收稿日期:2021-07-23 修回日期:2021-11-16 出版日期:2022-04-01 发布日期:2022-04-02
  • 通讯作者: 邹华耀,男,1963年生,中国石油大学(北京)教授,主要从事油气运聚机理及富集规律研究。E-mail: huayaozou@cup.edu.cn。
  • 作者简介:邓成昆,男,1996年生,中国石油大学(北京)地球科学学院硕士研究生,从事沉积学与储层地质学研究。E-mail: 582692959@qq.com。
  • 基金资助:

    *国家自然科学基金项目(编号: 42172152)资助

Characteristics and main controlling factors of shoal reservoirs in the Middle-Upper Cambrian Xixiangchi Formation,central Sichuan Basin

Deng Cheng-Kun1,2, Li Ting1,2, Yang Wei-Qiang1,2, Zhang Xi-Hua3, Cheng Zhong-Zhen1,2, Chen Hao-Ru4, Zhu Dan-Cheng1,2, Hu Li-Wen1,2, Zou Hua-Yao1,2   

  1. 1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;
    2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;
    3 Research Institute of Exploration and Development,PetroChina Southwest Oil & Gasfield Company,Chengdu 610041,China;
    4 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China
  • Received:2021-07-23 Revised:2021-11-16 Online:2022-04-01 Published:2022-04-02
  • Contact: Zou Hua-Yao,born in 1963,is a professor of China University of Petroleum(Beijing). He is mainly engaged in oil and gas migration and accumulation mechanism and enrichment law. E-mail: huayaozou@cup.edu.cn。
  • About author:Deng Cheng-Kun,born in 1996,is a master degree candidate in College of Geosciences,China University of Petroleum(Beijing). He is engaged in sedimentology and reservoir geology. E-mail: 582692959@qq.com。
  • Supported by:

    National Natural Science Foundation of China(No.42172152)

摘要:

川中地区中上寒武统洗象池组油气勘探一直未取得大规模突破,仅在威远—资阳地区获得了少量产能,研究其储集层形成过程和主控因素可以为勘探提供更可靠的地质依据。本研究基于川中地区的野外露头、岩心、薄片和钻测井等地质资料,对川中地区洗象池组储集层特征进行了详细的研究,在此基础上分析了不同类型颗粒滩沉积组合、准同生溶蚀作用和表生岩溶作用对储集层的影响。结果表明: (1)研究区洗象池组储集岩主要为颗粒白云岩,根据原始结构保存程度,可将颗粒白云岩划分为残余颗粒白云岩和粉晶—细晶白云岩,储集空间以粒间溶孔、晶间溶孔及小型溶洞为主,整体表现为低孔低渗的特征;(2)研究区洗象池组发育潟湖—颗粒滩(—台坪)、颗粒滩—台坪(混积潮坪)、多期颗粒滩垂向叠置3种颗粒滩沉积组合类型,其中多期颗粒滩垂向叠置可形成厚度较大的颗粒岩段,其储集层物性最好;(3)准同生溶蚀作用是川中洗象池组储集层形成的关键,加里东期表生溶蚀作用改善了储集层质量。

关键词: 颗粒滩, 沉积组合, 储集层特征, 溶蚀作用, 洗象池组, 川中地区

Abstract:

Within the Middle and Upper Cambrian Xixiangchi Formation,large-scale breakthroughs of the oil and gas exploration never came true and only a small amount of productivity were obtained in the Weiyuan-Ziyang area. Hence,investigating the formation and associated controlling factors of those reservoirs can provide geological basis for the future hydrocargon exploration. Based on outcrops,cores,thin sections,as well as drilling and logging data of the central Sichuan Basin,this study made a detailed description for the characteristics of the Xixiangchi reservoir and then analyzed the influences of the shoal depositional combinations,eogenetic karstification and the telogenetic karstification on the reservoir. The results show that: (1)The Xixiangchi reservoir in the study area is mainly granular dolostone. Based on whether the inner texture of grains can be preserved,the granular dolomite is divided into residual clastic texture dolomite and powder-fine crystal dolomite,whose reservoir spaces come from intergranular dissolved pores,intercrystalline dissolved pores and vugs,and thus,those reservoirs are characterized by low porosity and low permeability as a whole;(2)There are three types of shoal depositional combinations in the Xixiangchi Formation,which are lagoon-shoal(-tidal flat),shoal-tidal flat or mixed tidal flat,and multi-stage shoal vertical overlapping,respectively. The multi-stage shoal vertical overlapping can form a stratal succession with the most grainstone,whose reservoir properties are the best;(3)The eogenetic karstification is crucial for the formation of the reservoir and the telogenetic karstification could also improve the reservoir quality.

Key words: shoal, depositional combination, reservoir characteristics, dissolution, Xixiangchi Formation, central Sichuan Basin

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