川中公山庙地区侏罗系天然气地球化学特征  

Geochemical Characteristics of Jurassic Gas in Gongshanmiao Area,Central Sichuan Basin

作　　者：陈飞 何小平 梁绍洪[2] 

机构地区：[1]中国石油西南油气田公司川中油气矿,四川南充637000 [2]中国石化中原油田采油一厂地质研究所,河南濮阳457171

出　　处：《天然气技术与经济》2013年第2期6-9,77,共4页Natural Gas Technology and Economy

摘　　要：根据天然气中基本组分、碳同位素和轻烃特征,对川中公山庙地区天然气地球化学特征进行了分析。天然气组分特征分析表明,研究区天然气甲烷含量低,重烃含量高,主要为湿气;研究区天然气各主要烷烃气含量变化较大,气源关系复杂,天然气主要来自中、下侏罗统烃源岩,部分来自上三叠统烃源岩。研究区天然气表现出正碳同位素分布特征,体现了天然气的有机成因;天然气甲烷、乙烷碳同位素值的差异,表明研究区天然气主要为油型气,部分为煤型气;碳同位素计算研究区天然气成熟度值为0.6%～1.0%。对天然气轻烃进行分析,结果也表明研究区天然气主要为油型气。Based on some characteristics of basic composition, carbon isotope and light hydrocarbon of gas in Gongshanmiao area, central Sichuan Basin,its geochemical characteristics are analyzed. Results show that in the study area,(a)there is low methane(CH4)and high light hydrocarbon,and the gas mainly belongs to wet gas;(b)for different and main alkane gas,the content exhibits a considerable variation. And the relationship between gas and source is very complicated. Gas mainly comes from Middle to Lower Jurassic source rock,partly from Upper Triassic source rock;(c)the gas is characterized by positive carbon isotopic distribution,representing an organic origin;(d)the difference of carbon isotopic value between CH 4 and ethane may illustrate the gas is mainly petroliferous gas and partly coal-related gas; and(e)the gas maturity ranges from 0.6 % to 1.0 %. In addition,the analysis on light carbon may also represent gas in the study area mainly belongs to petroliferous gas.

关 键 词：公山庙地区 碳同位素特征 轻烃特征 地球化学特征 

分 类 号：P618.13[天文地球—矿床学]