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.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2009年第1期184-187,397,共4页
Journal of Oil and Gas Technology
关键词
苏里格气田
石盒子组
煤成气
碳同位素
Sulige Gas Field
Shihezi Formation
coal-bed gas
carbon isotope
