渤海湾盆地CO2气田(藏)地球化学特征及分布  

Geochemical characteristics and distribution of CO_2 gas fieldsin Bohai Bay Basin

作　　者：胡安平[1] 戴金星[1,2,3] 杨春[1] 周庆华[2] 倪云燕[2] 

机构地区：[1]浙江大学地球科学系 [2]中国石油勘探开发研究院 [3]中国石油大学北京资源与信息学院

出　　处：《石油勘探与开发》2009年第2期181-189,共9页Petroleum Exploration and Development

基　　金：中国石油科技项目(07-01C-01-07)

摘　　要：通过对渤海湾盆地典型CO2气田(藏)系统的地质与地球化学特征分析,研究了CO2气田(藏)的成因及分布规律。中国东部渤海湾盆地黄骅坳陷和济阳坳陷已发现11个CO2气田(藏),天然气地球化学特征分析显示:气田(藏)中CO2含量、1δ3CCO2组成和R/Ra值互呈正相关关系,而CO2含量与CH4含量呈负相关关系;δ13CCO2组成较重、R/Ra值及40Ar/36Ar值较大,说明CO2以幔源无机成因为主。黄骅坳陷CO2气田(藏)存在有机成因和无机成因两种不同类型的烷烃气,而济阳坳陷CO2气田(藏)中的烷烃气是有机成因的,并以油型气为主。结合该区地质特征研究发现,火山幔源型CO2气田(藏)通常分布在高地温场、断裂交汇部位、火成岩区及其附近和R/Ra值高异常带,这些规律可为预测CO2富集有利区提供依据。Eleven CO2 gas fields （pools） have been discovered in the Huanghua and Jiyang depressions of Bohai Bay Basin, Eastern China. The analyses of natural gas geochemical data in the CO2 gas fields （pools） reveal： First, there is a positive correlation between CO2 content, δ^13 CCO2 Values and R/Ra values, but a negative correlation between CO2 content and CH4 content; Second, the elevated δ^13 CCO2 , R/Ra and ^40 At/^36 Ar values show that CO2 is mantle-derived; Third, organic and inorganic alkane gases are both discovered in the CO2 gas fields of the Huanghua Depression, and the alkane gas in the Jiyang Depression is mainly oil-type. Taking the geological background of the region into consideration, the article concludes that the high geothermal field region, intersection part of faults, magmatic rock region.and high R/Ra, values region are favorable abundance zones for CO2 gas fields （pools）.

关 键 词：渤海湾盆地 CO2气田(藏) CO2成因 地球化学特征 断裂 氦同位素 

分 类 号：TE122.1[石油与天然气工程—油气勘探]