中国煤成气湿度和成熟度关系  

Relationships between wetness and maturity of coal-derived gas in China

作　　者：戴金星[1] 倪云燕[1] 张文正[2] 黄士鹏[1] 龚德瑜 刘丹[1] 冯子齐[1] 

机构地区：[1]中国石油勘探开发研究院 [2]中国石油长庆油田公司石油勘探开发研究院

出　　处：《石油勘探与开发》2016年第5期675-677,共3页Petroleum Exploration and Development

基　　金：中国石油天然气股份有限公司科技管理部项目(2014B-0608)

摘　　要：鉴于煤成气组分中分子种类少、分子结构简单、分子量小、分子直径小、易扩散且易长途运移,确定气源岩成熟度可利用的科学信息较少、难度大的问题,研究天然气湿度和气源岩成熟度的相关性。通过分析中国鄂尔多斯、四川、渤海湾、琼东南、准噶尔和吐哈盆地49口煤成气井天然气组分中分子种类最多、含气量最大的烷烃气组合的湿度及其与气源岩Ro值的关联性,发现随Ro值增大,天然气湿度变小,二者呈负相关关系,据此得出中国煤成气湿度与成熟度的关系,从而快速获取气源岩Ro值,为确定气源岩层位和天然气资源评价提供重要科学依据。Owing to its limited homologous,simple structure,small molecular weight and radius,natural gas could diffuse easily and migrate in a long distance,which greatly increases the difficulties of the study of source rock maturity.So in this paper we study the relationship between natural gas wetness and source rock maturity.Based on 49 coal-derived gas samples from the Ordos,Sichuan,Bohai Bay,Qiongdongnan,Junggar and Turpan–Hami basins in China with integral molecular series,it is discovered that the wetness of natural gas decreases with the maturity（Ro） of source rock.The negative correlation between wetness and maturity was established.Since the wetness could be easily acquired,the Ro could be quickly calculated based on the relationship,which provides important basis for gas source definition and resource evaluation.

关 键 词：煤成气 湿度 成熟度 气源岩 天然气资源评价 

分 类 号：TE122[石油与天然气工程—油气勘探]