南盘江盆地秧1井天然气地球化学特征  

GEOCHEMICAL CHARACTERISTICS OF THE NATURAL GAS IN WELL YANG-1 IN NANPA NJIANG BASIN

作　　者：李钜源[1] 朱日房[2] 陶军明[2] 廖永胜[2] 

机构地区：[1]石油大学.华东 [2]中国石化胜利油田有限公司地质科学研究院

出　　处：《天然气工业》2005年第5期18-20,共3页Natural Gas Industry

摘　　要：在南盘江盆地秧坝凹陷秧1井二叠系茅口组-栖霞组2573～2594 m发现了低产二氧化碳气藏.该井是南盘江盆地第一口区域探井,查明该气藏的成因对该地区天然气勘探具有重要的指导意义.在分析天然气地球化学特征的基础上,对秧1井岩心和周边露头样品进行了有机地球化学和有机岩石学分析以及二氧化碳气源岩热模拟试验,研究了该气藏天然气的成因和来源.综合分析认为,秧1井天然气中烃类组分是过成熟煤型裂解气,来源于二叠系煤系烃源岩;天然气稀有气体He、Ar同位素特征指示了天然气主要为壳源;而二氧化碳主要为岩石化学成因,形成于石炭二叠系碳酸盐岩的低温(300 ℃以下)水解作用.A low productivity carbon dioxide gas reservoir was found at the well depths of 2573-2594 m of Maokou Formation - Qixia Formation, Permian, in well Yang-1 in Yangba Seg of Nanpanjiang Basin. It is very important for natural gas exploration in the region to find out the origins of the gas reservoir, because this well is the first regional exploration well in the basin. On the basis of analyzing the geochemical characteristics of the natural gas, the genesis and origins of the natural gas in the reservoir were investigated by means of the organic geochemical and organic petrological analyses, of the cores of well Yang-1 and the rock samples of peripheric outcrops, and of the thermal simulation experiments of the carbon dioxide gas source rocks. The comprehensive analysis results indicated that the hydrocarbon in the natural gas in well Yang-1 was the overmature coal-type cracking gas and came from the Permian coal measure hydrocarbon source rocks; according to the He and Ar isotopic ratios, the natural gas was mainly the crustal source gas; and the carbon dioxide was mainly the petrochemical genesis, being formed by the low temperature (<300°C) hydrolysis of the Carboniferous-Permian carbonate rocks.

关 键 词：地球化学特征 南盘江盆地 二氧化碳气藏 有机地球化学 天然气勘探 热模拟试验 煤系烃源岩 同位素特征 石炭二叠系 有机岩石 综合分析 烃类组分 稀有气体 化学成因 水解作用 碳酸盐岩 栖霞组 茅口组 气源岩 裂解气 凹陷 

分 类 号：P618.13[天文地球—矿床学]