柴达木盆地西部坳陷区混源气判识  

Discrimination of mixed gases in western depression of Qaidam basin

作　　者：马立元[1] 张晓宝[1] 胡勇[2] 段毅[1] 李秀芬[1] 宋成鹏[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,甘肃兰州730000 [2]中国石油天然气总公司青海油田分公司勘探开发研究院,甘肃敦煌736200

出　　处：《石油与天然气地质》2004年第6期625-628,共4页Oil & Gas Geology

基　　金：国家自然科学基金项目 (4 9972 0 5 1;40 172 0 5 3 ) ;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 (KZCX2 -111)

摘　　要：通过柴达木盆地西部坳陷区 13个油气田的 34个天然气样品组分和碳同位素值分析 ,运用天然气的甲烷、乙烷和丙烷碳同位素组成判识 ,柴达木盆地西部坳陷区天然气可划分为腐泥型原油伴生气 ,混合型原油伴生气 ,煤型气和混合成因气等 4种类型混源气。西部坳陷区的大多数天然气属同源同阶的腐泥型原油伴生气、混合型原油伴生气或煤型气 ,由生物气或未熟混合型原油伴生气和低熟混合型原油伴生气复合而成的混合成因气仅分布于尕斯断陷亚区尕斯库勒油田浅层 (上第三系 ) ,跃进二号西交点 。Chemical compositions and carbon isotopes of 34 natural gas samples, collected from 13 oil and gas fields in western depression of Qaidam basin, are measured and analyzed. Based on the carbon isotopes of methane, ethane and propane in the gas samples, the natural gas in western depression of Qaidam basin can be divided into 4 different types, including sapropel type oil associated gas, mixed type oil associated gas, coal related (humic) gas and hybrid gas. Most of the gases in western depression are cogenetic and synchronous sapropel type oil associated gas, mixed type oil associated gas and coal related gas. Hybrid gas, consisted of biogas, immature mixed type oil associated gas and low mature mixed type oil associated gas, distribute only in the shallow layers (Neogene) in Gas Hure oilfield in Gas faulted depression, the Yuejin No. 2 west intersection point, Youshashan oilfield and Wunan oilfield in Kunbei fault bench zone.

关 键 词：天然气 混合气 碳同位素 柴达木盆地 

分 类 号：TE112.1[石油与天然气工程—油气勘探]