天然气初次裂解与二次裂解作用判识  

DISCRIMINATING BETWEEN PRIMARY CRACKING GAS AND SECONDARY CRACKING GAS

作　　者：马立元[1] 张晓宝[1] 胡勇 段毅[1] 孟自芳[1] 贺鹏 李秀芬[1] 

机构地区：[1]中国科学院兰州地质研究所气体地球化学国家重点实验室 [2]中国石油青海油田分公司勘探开发研究院

出　　处：《天然气工业》2003年第5期8-11,共4页Natural Gas Industry

基　　金：中国科学院资源环境领域知识创新工程重大 (重要方向 )项目 (批准号 :KZCX3-SW - 12 8);国家自然科学基金项目 (批准号 :4 9972 0 5 1;4 0 172 0 5 3)资助

摘　　要：系统采集了柴达木盆地不同构造分区 16个油气田的 30个天然气样品 ,测试了其组分和碳同位素值 ,运用前人建立的判识模式并结合天然气地球化学判识指标 ,区分出了柴达木盆地干酪根初次裂解气和烃类的二次裂解气。柴达木盆地西部各油气田天然气、北部冷湖油气田天然气为干酪根初次裂解的产物 ,而分布于南八仙气田的部分气井和伊深 1井 15 0 0m以下产层的天然气则属于烃类的二次裂解气。文章的研究结果对柴达木盆地天然气成因研究与天然气勘探具有重要的参考价值。The chemical composition and carbon isotope of 30 natural gas samples collected from 16 oil-gas fields in different structural zones in Chaidamu Basin were measured. By use of the discriminating pattern established by our predecessors and in combination with the geochemical discrminating indexes of natural gas, these gases can be divided into the primary cracking gas from kerogen and the secondary cracking gas from hydrocarbon in Chaidsmu Basin. In other words, the natural gas in various oil-gas fields in the west part of Chaidamu Basin and the one in Lenghu oil-gas field in the north part of the basin are the primary cracking gas from kerogen, however, the gas in some wells in Nanbaxian gas field and the one produced under 1 500 m in well Yishen - 1 in the basin are the secondary cracking gas from hydrocarbon. These investigation results proposed in the paper are of important significance for natural gas genetic research and gas exploration in Chaidamu Basin.

关 键 词：天然气 裂解 二次裂解 判识模式 柴达木盆地 

分 类 号：P618.13[天文地球—矿床学] TE13[天文地球—地质学]