石油勘探与开发 >

2016 , Vol. 43 >Issue 2: 189 - 197

DOI: https://doi.org/10.11698/PED.2016.02.04

油气勘探

四川盆地涪陵气田五峰组—龙马溪组页岩优势岩相

  • 吴蓝宇 ,
  • 胡东风 ,
  • 陆永潮 ,
  • 刘若冰 ,
  • 刘晓峰
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  • 1. 中国地质大学（武汉）资源学院；
    2. 中国石油化工股份有限公司勘探分公司
吴蓝宇（1990-）,女,江苏南京人,中国地质大学（武汉）在读博士研究生,主要从事层序地层与非常规油气地质方面的研究。地址：湖北省武汉市鲁磨路388号,中国地质大学（武汉）资源学院,邮政编码：430074。E-mail：472401404@qq.com

网络出版日期: 2017-01-01

基金资助

国家重点基础研究发展计划（973）项目（SQ2013CB021013）

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Advantageous shale lithofacies of Wufeng Formation-Longmaxi Formation in Fuling gas field of Sichuan Basin, SW China

  • WU Lanyu ,
  • HU Dongfeng ,
  • LU Yongchao ,
  • LIU Ruobing ,
  • LIU Xiaofeng
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  • 1. Faculty of Earth Resources, China University of Geoscience (Wuhan), Wuhan 430074, China;
    2. Sinopec Exploration Branch Company, Chengdu 610041, China

Online published: 2017-01-01

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摘要

以四川盆地涪陵气田主力产层上奥陶统五峰组—下志留统龙马溪组页岩为研究对象,利用改进的硅质矿物-碳酸盐矿物-黏土矿物三端元图解,对其页岩岩相类型进行精细划分。涪陵气田五峰组—龙马溪组页岩主要发育8种岩相：硅质页岩相（S）、混合硅质页岩相（S-2）、含黏土硅质页岩相（S-3）、含灰/硅混合质页岩相（M-1）、含黏土/硅混合质页岩相（M-2）、混合质页岩相（M）、含硅黏土质页岩相（CM-1）和含黏土/灰混合质页岩相（M-3）。将优势岩相定义为页岩的含气量达到特定工业标准的岩相,结合研究区开发现状,划分出2类优势岩相,即含气量大于4.0 m3/t评为Ⅰ类（特优）,含气量在2.0~4.0 m3/t评为Ⅱ类（优）。筛选出有机质丰度、硅质矿物含量、黏土矿物含量3项参数与含气量作相关性分析,建立了五峰组—龙马溪组一段页岩优势岩相的分级标准,确定了研究区混合硅质页岩相（S-2）、含黏土硅质页岩相（S-3）为Ⅰ类优势岩相,含黏土/硅混合质页岩相（M-2）为Ⅱ类优势岩相。页岩优势岩相分级标准可为其他区块页岩气评价提供参考。图5参31

关键词： 页岩; 优势岩相; 奥陶系五峰组; 志留系龙马溪组; 涪陵气田; 四川盆地

本文引用格式

吴蓝宇 , 胡东风 , 陆永潮 , 刘若冰 , 刘晓峰 . 四川盆地涪陵气田五峰组—龙马溪组页岩优势岩相[J]. 石油勘探与开发, 2016 , 43(2) : 189 -197 . DOI: 10.11698/PED.2016.02.04

Abstract

The lithofacies types of Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation shale, the main producing layer in Fuling gas field, are classified in detail using the modified ternary diagram of siliceous minerals-carbonates minerals-clay minerals. There develop eight lithofacies in the Wufeng-Longmaxi shale: siliceous shale lithofacies (S), mixed siliceous shale lithofacies (S-2), clay-rich siliceous shale lithofacies (S-3), calcareous/siliceous mixed shale lithofacies (M-1), argillaceous/siliceous mixed shale lithofacies (M-2), mixed shale lithofacies (M), silica-rich argillaceous shale lithofacies (CM-1), and argillaceous/calcareous mixed shale lithofacies (M-3). The advantageous shale lithofacies is defined as lithofacies with gas content reaching a specific industrial standard. Based on the current development status of the study area, advantageous shale lithofacies is divided into two classes, namely, Class I with gas content of more than 4.0 m3/t (also known as extra superior), Class II with gas content of 2.0-4.0 m3/t (also known as superior). The correlation between the abundance of organic matter, the content of siliceous mineral, clay content and gas content has been analyzed to establish the classification criteria for advantageous shale lithofacies in the Wufeng-Longmaxi shale. The mixed siliceous shale lithofacies (S-2) and clay-rich siliceous shale lithofacies (S-3) have been identified as Class I advantageous shale lithofacies, and argillaceous/siliceous mixed shale lithofacies (M-2) as Class II. The classification criteria of advantageous shale lithofacies can provide reference for shale gas evaluation in other exploration areas.

Key words： shale; advantageous shale lithofacies; Ordovician Wufeng Formation; Silurian Longmaxi Formation; Fuling gas field; Sichuan Basin

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