南海西部深水区气田天然气地球化学特征差异及其成因

熊小峰, 郭潇潇, 朱继田, 郭明刚, 李兴

doi:10.11764/j.issn.1672-1926.2019.04.010

天然气地球科学 >

2019 , Vol. 30 >Issue 7: 1053 - 1062

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.04.010

天然气地球化学

南海西部深水区气田天然气地球化学特征差异及其成因

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中海石油(中国)有限公司湛江分公司，广东湛江 524057

熊小峰(1986-)，男，湖北应城人，工程师，硕士，主要从事油气地球化学与成藏综合研究.E-mail：xiongxf@cnooc.com.cn.

收稿日期: 2019-02-25

修回日期: 2019-04-23

网络出版日期: 2019-08-07

基金资助

国家“十三五”科技重大专项“琼东南盆地深水区大中型气田形成条件及勘探关键技术”(编号：2016ZX05026-002)资助.

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Causes of natural gas geochemical differences in the deep water area gas field，western South China Sea

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Zhanjiang Branch of CNOOC Ltd.，Guangdong 524057，China

Xiong Xiaofeng(1986-), Male, Engineer, Master, Mainly engaged in comprehensive research on oil and gas geochemistry and reservoir formation. E-mail：xiongxf@cnooc.com.cn.

Received date: 2019-02-25

Revised date: 2019-04-23

Online published: 2019-08-07

Supported by

Supported by the China National Science and Technology Major Project for the 13th Five-Year Plan “Formation conditions and key exploration techniques of large and medium-sized gas fields in deep water area of Qiongdongnan Basin” (Grant No. 2016ZX05026-002).

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摘要

在琼东南盆地深水中东区勘探新发现了与西区中央峡谷气田特征不同的天然气。目前关于它们的差异及其成因的研究甚少，制约了研究区进一步勘探工作。在油气地球化学特征精细剖析基础上，综合烃源岩沉积环境、孢粉相及地球化学等资料对天然气差异成因进行研究。结果表明，深水区天然气主要为源自下渐新统的煤型气，但不同区天然气重烃碳同位素组成、干燥系数与伴生凝析油甾烷特征及全油碳同位素组成等差别明显。依据差异将深水区煤型气细分为M型与C型2种。前者主要见于中部松南低凸起及东区凹陷边缘，后者见于西区中央峡谷内。两类气差异根源在于二者的烃源岩沉积环境及生气母质的组成不同。除了已形成中央峡谷大型气田C型煤型气外，M型天然气的烃源岩亦具有良好品质和较强的生气潜力，将是深水区天然气勘探的又一重要类型。

关键词： 天然气; 地球化学特征差异; 类型划分; 差异分布; 深水区; 南海西部

本文引用格式

熊小峰, 郭潇潇, 朱继田, 郭明刚, 李兴 . 南海西部深水区气田天然气地球化学特征差异及其成因[J]. 天然气地球科学, 2019 , 30(7) : 1053 -1062 . DOI: 10.11764/j.issn.1672-1926.2019.04.010

Abstract

A recent discovery of new gas type has been found in the central and eastern deep water of Qiongdongnan Basin，which is proved to be different from the found gases in the western part.The discrepancy and origin discussions are rare and preconditions have been urgent for further exploration.This work exhibits a comprehensive understanding of source rock sedimentation，palynofacies and detailed gas geochemistry to study the formation of natural gas.It is concluded that source rocks in the Lower Oligocene contribute to the natural gas in the deep water，whereas differences are remarkable in the parts of exploration.Chemical and isotopic characteristics of gas and oil have been conducted and two types，Type M and Type C，have been recognized.Gas type M has been usually seen in Songnan Uplift in the central part and the margin of eastern sag.Gas type C is discovered in the western Central Canyon.The main discrepancy of the origin for the gas discovered is the source rock sedimentation environment and the precursor reserved therein.Gas type M has been emerged to be a good gas potential and quality besides the Gas type C found in the central canyon，which will be another important type of natural gas exploration in deep water areas.

Key words： Natural gas; Geochemical differences; Type classification; Differentiated distribution; Deep water area; Western South China Sea

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