崖13—1气田混合气混合体积比例计算  

VOLUMETRIC PROPORTION EVALUATION OF MIXED GAS IN YC13-1 GAS FIELD

作　　者：傅宁 

机构地区：[1]中国海洋石油勘探开发研究中心，河北高碑店074000

出　　处：《中国海上油气（地质）》2000年第4期258-261,共4页China Offshore Oil and Gas(Geology)

摘　　要：自然界不同来源和不同成因天然气的混合是一种普遍现象，混合作用是一种物理过程，混合气体积为各组分在混合气中的含量，以其体积比例加权的和。因此，根据混合气和被混合气的碳同位素丰度可确定在各种被混合气的比例，根据这一原理对崖13－1气田天然气的混合比例进行了计算，结果表明，崖13－1气田北块区（YC13－1－1，2，4井）混合气有50％－75％可能是来自气田下伏崖城组，陵水组煤系源岩所生的煤成气，而南块区（YC13－1－3，6井）混合气则有75％是来源于崖南凹陷沉积中心的崖城组，陵水且浅海相源岩所生的海相油型气。Mixing of gases from different sources and with various origins is universal in nature.This is a physical process,and a mixed gas can be represented by a weighted sum of volumetric proportions of all components in it.Volumetric proportion of each component in a mixed gas can be determined by isotopic carbon composition in laboratory.As a result,a calculation of volumetric proportion of mixed gas in YC13 1 field shows that in North block of the field(YC13 1 1,2,4),50-75 percent of the gas comes from underlying coal measures of Yacheng and Lingshui Formation,and that in South block(YC13 1 3,6),75 percent of the gas is from Paleogene marine sources of Yacheng and Lingshui Formation in the depocenter of Yanan sag.

关 键 词：混合体积比例 计算 天然气 成因 天然气混合作用 甲烷碳同位素 崖13-1气田 

分 类 号：P618.130.1[天文地球—矿床学] TE12[天文地球—地质学]