苏里格气田天然气运移和气源分析  

GEOCHEMISTRY OF NATURAL GAS AND CRUDE COMPUTATION OF GAS-GENERATED CONTRIBUTION FOR VARIOUS SOURCE ROCKS IN SULIGE GAS FIELD,ORDOS BASIN

作　　者：刘全有[1] 刘文汇[2] 徐永昌[3] 李剑[4] 陈孟晋[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石化石油勘探开发研究院,北京100083 [3]中国科学院地质与地球物理研究所兰州油气资源研究中心,甘肃兰州730000 [4]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《天然气地球科学》2007年第5期697-702,共6页Natural Gas Geoscience

基　　金：国家自然科学基金项目(编号:40673018);国家重点基础研究发展计划项目(编号:2003CB214603)联合资助

摘　　要：通过分析鄂尔多斯盆地苏里格气田天然气组分、稳定同位素和稀有气体同位素组成指出,该气田天然气以烃类气体为主,气体碳同位素组成偏重;天然气源岩形成于淡水—半咸水沉积环境;天然气主要来源于石炭—二叠系煤系烃源岩;天然气碳同位素(1δ3C1,1δ3C2)具有从西南向东北方向变重和3H e/4H e值呈略增加的趋势;反映了天然气具有从东北向西南运移的趋势。根据天然气中40A r/36A r值,计算了石炭—二叠系源岩中K含量的变化范围,初步确定了煤岩生成天然气的贡献率在65%以上,为主要生气源岩。According to measuring chemical composition, stable isotope and noble gas isotope in natural gas from Sulige gas field, Ordos basin, that natural gas is characterized as the higher concentration of hydrocarbon gases enriching in ^13C, suggests the gaseous alkanes were derived from humic matter, in combination with the hydrogen isotopes referring the source rocks of natural gas would be deposited in flesh-brackish water. The pathway of natural gas migration in Sulige gas field is principally directed from northeast to southwest, based on the tendency of enrichment in ^13C of hydrocarbon gases from southwest to northeast and slight increase of ^3He/^4He ratios. Based on the ^40Ar/^36Ar ratios in natural gas, the K concentration in the source rocks in C-P was calculated, and then the more 65 % contributing proportion of coal to gas generation as a source rock was determined.

关 键 词：苏里格气田 稳定同位素 稀有气体同位素 运移 贡献率 

分 类 号：TE122.1[石油与天然气工程—油气勘探]