土壤气中He、Ar组分在金家地区油气化探中应用研究

对济阳凹陷南缘与鲁西隆起接合部开展了土壤气He、Ar组分及Ar同位素测定,结果表明He的丰度从5.1-6μL/L(S.T.P),δHe值从-4%-16%,平均2.59%;⁴⁰Ar/³⁶Ar比值从255-325,δ(⁴⁰Ar/³⁶Ar)值从+11%-11%,He异常主要分布在研究区北部,而Ar等值图分布比较复杂。He、Ar、烃三组分之间的组合关系表明有3个远景区,最有意义的是中深层远景区。此外,根据地质分析及Ar同位素特征表明中深层异常远景区不仅是与已知的第三系油田有关,而且还与深部C-P煤系地层有关,故属煤成气异常。

THE STUDY OF HELIUM AND ARGON IN SOIL GASES IN JINJIA AREA FOR OIL-GAS EXPLORATION

Using helium techaique to find oil-gas pool has been applited for several years.Recently, the authors have just developed a new technique-combination of heliumand argon for oil-gas exploration.The result shows that the abundance of δHe is 5.1-6 μL/L(S.T.P),δHe is from-4% to 16%, average is 2.59%; the values of,⁴⁰Ar/³⁶Ar in soil gas are 255-325, thevalue of δ(⁴⁰Ar/³⁶Ar) is from +11 %-11%, average is-0.50%. The research suggests that the anomaly of δHe is related to oil-gas pool, but tEe anomaly of δ(⁴⁰Ar/³⁶Ar) is rather complex. For negative value of 6(⁴⁰Ar/³⁶Ar) the more negative it is.the more it is riched in ³⁶Ar, and the more argon is fractionated. As the cap rockabove oil-gas pool is usually cemented by CaCO₃, the channel is getting worse with.increasing argon fractionation. That is why tEe negat ive values of δ (⁴⁰Ar/³⁶Ar) always occur above oil-gas pool.The authors discover that there are eight patterns among He, Ar and hydrocarbon. Different patterns have different significance for oil-gas estimation. According’to their re lationship with each oiLer three kinds of prospect for oil-gas explorationhave been estimated, but the mid-deep gas prospect area is the best.