洞庭盆地第四系极浅层天然气成因类型及地质意义

钟洪洋, 张道勇, 肖明国, 徐耀辉,

doi:10.11764/j.issn.1672-1926.2018.10.004

天然气地球科学 >

2019 , Vol. 30 >Issue 3: 361 - 369

DOI: https://doi.org/10.11764/j.issn.1672-1926.2018.10.004

天然气地质学

洞庭盆地第四系极浅层天然气成因类型及地质意义

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1.油气资源与勘探技术教育部重点实验室(长江大学)，湖北武汉 430100；
2.非常规油气湖北省协同创新中心，湖北武汉 430100；
3.自然资源部油气资源战略研究中心，北京 100034；
4.湖南华晟能源投资发展有限公司，湖南长沙 410004

钟洪洋(1993-)，男，湖北孝感人，硕士研究生，主要从事油气地球化学研究. E-mail：zhonghongyang1123@163.com.

收稿日期: 2018-09-10

修回日期: 2018-10-12

网络出版日期: 2019-04-01

基金资助

“十三五”全国油气资源评价(编号：2017YQZYPJ01)；国家自然科学基金项目(编号：41672117)；湖北省自然科学基金创新群体项目(编号：2017CFA027)联合资助.

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Genetic types and geological significance of natural gas from extremely shallow Quaternary in Dongting Basin

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1.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,
Yangtze University,Wuhan 430100,China;2.Unconventional Oil and Gas Collaborative Innovation Center
in Hubei Province,Yangtze University,Wuhan 430100,China;3.Strategic Research Center of Oil and
Gas Resources,Ministry of Land and Resources,Beijing 100034,China;4.Hunan Huasheng Energy Investment Development Co. Ltd.,Changsha 410004,China

Received date: 2018-09-10

Revised date: 2018-10-12

Online published: 2019-04-01

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摘要

洞庭盆地自然出露地表的天然气苗众多，预示盆地内可能具有比较丰富的浅层天然气资源。通过对洞庭盆地野外地质调查及对沅江县共华镇发现的天然气进行气体组成及同位素分析，显示天然气组分主要为CH₄，且不含C₂H₆以上的重烃，CH₄碳同位素值平均为-79.6‰，表现出典型的生物成因气特征。造成和兴村与宪成垸村天然气碳氢同位素值差异较大的原因可能是存在同位素分馏现象。根据CH₄的碳氢同位素值及CO₂的碳同位素值分布关系，判断该生物气为CO₂还原途径生成。推测全新世由于掀斜式构造沉降使江汉盆地大量硅藻随湖水流入洞庭盆地，为生物气的形成提供了丰富的物源及有利的沉积环境。洞庭盆地DQ1与DQ2浅井揭示了纵向上均为上细下粗的正韵律沉积序列，生物气的埋深极浅，分布于10~120m之间，为自生自储式组合类型。由于埋藏浅，开发成本低廉，如合理勘探、开发、利用，可造福一方地区。

关键词： 洞庭盆地; 同位素分析; 生物成因气; 沉积环境

本文引用格式

钟洪洋, 张道勇, 肖明国, 徐耀辉, . 洞庭盆地第四系极浅层天然气成因类型及地质意义[J]. 天然气地球科学, 2019 , 30(3) : 361 -369 . DOI: 10.11764/j.issn.1672-1926.2018.10.004

Abstract

There are many natural gas seepages on the surface of Dongting Basin,indicating that there may be abundant shallow gas resources in this basin.By analyzing the composition and isotope of nature gas collected from Gonghua town,Yuanjiang county during field geological investigation in Dongting Basin,it was discovered that this natural gas belonged to biogenic gas.The main composition of this natural gas was methane,without other alkane gases.Moreover,the average carbon isotopic ratio of methane was -79.6‰.The reason for the difference in carbon isotope and hydrogen isotope of natural gas between villages of Hexing and Xianchengyuan may be due to the isotope fractionation.It was concluded that the biogas formed through the pathway of carbon dioxide reduction on the basis of the distribution relation of carbon isotopes of methane and carbon dioxide.We speculated that a large number of diatoms from Jianghan Basin flowed into Dongting Basin with lake water due to the tilted tectonic subsidence during Holocene,which provided abundant material source and favorable sedimentary environment for the formation of biogas.The data of Wells DQ1 and DQ2 in Dongting Basin all presented positive rhythmic sedimentary sequence of upper and lower coarse in vertical direction.Biogas has a very shallow depth and is usually distributed between 10 and 120 meters.Moreover,its type is generally positive reservoir-forming combination of authigenic and self-accumulation type.If biogas could be properly explored,developed,and utilized,it would benefit one area due to its shallow burial depth and low development costs.

Key words： Dongting Basin; Isotopic analysis; Biogenic gas; Sedimentary environment

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