油气藏评价与开发 ›› 2022, Vol. 12 ›› Issue (1): 139-149.doi: 10.13809/j.cnki.cn32-1825/te.2022.01.012

• 页岩气 • 上一篇    下一篇

梁平福禄镇剖面大安寨段泥页岩地质特征

朱彤1,2,3(),张哲4,冯动军1,2,3,郑荣才5,王烽6,彭勇民1,2,3   

  1. 1.页岩油气富集机理与有效开发国家重点实验室,北京 100083
    2.中国石化页岩油气勘探开发重点实验室,北京 100083
    3.中国石化石油勘探开发研究院,北京 100083
    4.中国地质大学,北京 100083
    5.成都理工大学,四川 成都 610059
    6.中国石化油田勘探开发事业部,北京 100029
  • 收稿日期:2021-11-08 出版日期:2022-02-26 发布日期:2022-03-24
  • 作者简介:朱彤(1968—),女,硕士,高级工程师,从事页岩气地质研究。地址:北京市昌平区沙河镇白沙路5号中国石化科学技术研究中心,邮政编码:102206。E-mail: zhutong.syky@sinopec.com.com
  • 基金资助:
    中国石化页岩油气勘探开发重点实验室开放基金“四川盆地自流井组页岩成演化与储层孔隙形成机理”(33550000-21-ZC0613-0006)

Geological characteristics of mud shale in Da'anzhai section of Fulu Town, Liangping

ZHU Tong1,2,3(),ZHANG Zhe4,FENG Dongjun1,2,3,ZHENG Rongcai5,WANG Feng6,PENG Yongmin1,2,3   

  1. 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    2. Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China
    3. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China
    4. China University of Geosciences, Beijing 100083, China
    5. Chengdu University of Technology, Chengdu, Sichuan 610059, China
    6. Sinopec Oilfield Exploration and Development Department, Beijing 100029, China
  • Received:2021-11-08 Online:2022-02-26 Published:2022-03-24

摘要:

四川盆地侏罗系湖相泥页岩具有沉积相变快、岩性组合类型复杂多样、储层非均质性强的特点,与海相页岩存在较大的差异,因此,建立湖相泥页岩典型地质剖面,深入研究微相及岩性组合特征具有重要意义。选取川东重庆市梁平区福禄镇剖面大安寨段作为研究对象,通过对小层划分、沉积微相及其岩性组合特征的精细描述、样品采集,以及有机地化、储层物性和全岩X衍射等测试分析,结果表明:福禄镇剖面大安寨段主要为碳酸盐岩湖泊沉积,经历了完整的初始湖侵—最大湖侵—初始湖退3个阶段,微相及岩性组合具明显的三段式。大一亚段和大三亚段主要以碳酸盐浅湖介屑滩微相沉积的厚层介屑灰岩为特征,大二亚段为半深湖沉积,发育了湖坡风暴滩和半深湖泥2个微相,分别以灰色介屑灰岩与灰黑色泥页岩不等厚互层和厚层黑色页岩夹薄层介壳灰岩2种岩性组合为特征,泥页岩厚度大、有机质含量较高,特别是页岩与介屑灰岩互层组合,有利于微裂隙发育,脆性矿物含量相对较高,具有更好的渗透性和可压性,是页岩油气富集的甜点层段。与四川盆地典型页岩气钻井对比:大二亚段半深湖相主要分布于川东涪陵—建南地区,有利于页岩油气的形成;大一亚段和大三亚段碳酸盐浅湖介屑滩主要分布于川中—川东北地区,有利于致密油气的富集。

关键词: 岩性组合, 陆相泥页岩, 页岩油气, 大安寨段, 福禄镇, 四川盆地

Abstract:

The lacustrine mud shale in Jurassic of Sichuan Basin is characterized by fast sedimentary phase transition, complex and diverse lithological combination types, and strong reservoir inhomogeneity, which is quite different from the marine shale. Therefore, it is of great significance to establish a typical geological section of Jurassic lacustrine shale in Sichuan Basin and further study the microfacies and lithologic assemblage characteristics of lacustrine shale. The Da'anzhai section of Fulu Town, Liangping District, Chongqing, Eastern Sichuan is selected as the research object. Through the division of small layers, fine description of sedimentary microfacies and lithologic combination characteristics, sample collection, field profile measurement, organic geochemistry, reservoir physical properties and whole rock X-ray diffraction, it is shown that the Da'anzhai section of Fulu town is mainly carbonate lake sediments. The microfacies and lithologic assemblages have three stages: initial transgression, maximum transgression and initial regression. The first and third members of the Da'anzhai formation are mainly composed of the microfacies of the thick layer mesoclastic limestone deposited in the bioclastic beaches of the carbonate shallow lake; The second member of Da'anzhai formation is a semi deep lacustrine subfacies. There are two microfacies: Storm beach and semi deep lacustrine mud. They are characterized by two lithologic associations, i.e. unequal thickness interbedding of grey clastic limestone and grey black shale, and thick black shale with thin shell limestone, With high content of brittle minerals and better permeability and compressibility, it is a sweet spot for shale oil and gas enrichment. Compared with the typical shale gas drilling, The semi deep lacustrine facies of the second member is mainly distributed in Fuling Jiannan area in eastern Sichuan, which is conducive to the formation of shale oil and gas. The carbonate shallow lacustrine clastic shoals of the first and third members are mainly distributed in Central Sichuan Northeast Sichuan, which is conducive to the enrichment of tight oil and gas.

Key words: lithological association, continental shale, shale oil and gas, Da'anzhai section, Fulu Town section, Sichuan Basin

中图分类号: 

  • TE122