苏里格地区石盒子组天然气地球化学特征  

Geochemical Feature of Natural Gas in Shihezi Formation in Sulige Area

作　　者：李小娟[1] 陈义才[1] 王波[1] 何逢阳[1] 张胜[1] 刘新社[2] 段晓文[2] 赵慧涛[2] 韩会平[2] 

机构地区：[1]成都理工大学,四川成都610059 [2]长庆油田分公司勘探开发研究院,陕西西安710021

出　　处：《石油天然气学报》2009年第1期184-187,397,共4页Journal of Oil and Gas Technology

摘　　要：苏里格石盒子组天然气常规组成中烷烃气含量一般在90%以上,其中甲烷含量占绝对优势。天然气干燥系数(C1/C2+)变化范围较大,在5～140之间,并且随深度的增加呈现升高的趋势。二氧化碳含量普遍小于3%。烷烃气碳同位素具有典型煤成气的特征,但是部分样品乙烷碳同位素偏轻,有少数出现单项性碳同位素倒转。根据煤成气碳同位素与镜质体公式,计算出天然气的成熟度明显低于其C-P源岩的成熟度。综合分析认为,苏里格地区石盒子组天然气组成显示出具有多期成藏的特征,成熟早期充注的天然气仍然具有较好的保存。In Shihezi Formation,the concentration of alkane gas which was mostly composed of methane was generally 90% more than that of the common components of natural gas.And the dryness coefficients(C1/C+2) of natural gas was from 5 to 140 and grew up with the increase of depth.The carbon dioxide content was generally less than 3%.And carbon isotope of the alkane gas shows typical coal derived gas.However,some samples are lower value of carbon isotope of ethane and occasionally show reversal value in single type.The maturity of natural gas is obviously lower than that of C-P parent rocks as a result of calculation by using the formula of carbon isotope of coal derived gas and vitrinite.It is considered by a comprehensive analysis that the composition of natural gas in Shihezi Formation of Sulige Area has the character of multiphase pool.And some early filled natural gas is still well preserved.

关 键 词：苏里格气田 石盒子组 煤成气 碳同位素 

分 类 号：P618.13[天文地球—矿床学]