Mercury concentration in natural gas and its distribution in the Tarim Basin

作     者：LIU QuanYou 

作者机构：Research Institute of Petroleum Exploration & ProductionSINOPEC 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2013年第56卷第8期

页      面：1371-1379页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 40802028 & 41173035) the China National Key Fundamental Research and Development Project (Grant Nos. 2012CB214800 & 2005CB422108) the National Science & Technology Special Project (Grant No. 2011ZX05005) 

主　　题：天然气成因 塔里木盆地 汞含量 沉积环境 火山活动 构造活动 库车坳陷 西南坳陷 

摘      要：Here I collected natural gas samples from 41 industrial gas wells in the Tarim Basin,and studied the mercury distribution in the area.My data show that there is certain regularity in the distribution of mercury in the Tarim Basin.Generally,the mercury concentration is high at the edge of the basin and low in the central basin.The highest mercury concentration occurs in the Southwest Depression,ranging from 15428.5 to 296763.0ng/m3 with an average of 156095.7ng/m3,followed by the Kuqa Depression ranging from 15.0 to 56964.3ng/m3 with an average of 11793.7ng/m3,and the Hade oil and gas field in the North Depression has the lowest mercury concentration ranging from 17.7 to 3339.5ng/m3 with an average of 1678.6ng/m3.The mercury concentrations in the natural gases of different structural units are various,with the highest mercury concentration in the zone of strong structural activity of Southwest Depression.It is profitable of Hg accumulation in the self sourced and self accumulated gas reservoirs or volcanic existence;in contrast,the low Hg concentration exists in the secondary gas reservoir.The mercury concentration in the natural gas generated under continental depositional environment is higher than that in marine gas.Therefore,the mercury concentration in the natural gases is constrained by gas genesis,depositional environment of source rocks,tectonic activity,and volcanic activity,and the tectonic activity is the main factor for the mercury concentration in the natural gas,followed by volcanic activity and depositional environments.