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川西坳陷中段须家河组天然气碳同位素特征

Keywords: 川西坳陷,碳同位素倒转,天然气成因,须家河组

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Abstract:

?通过对川西坳陷中段须家河组天然气样品碳同位素分析,认为川西坳陷中段须家河组天然气为典型热解成因煤型气,须四段天然气主要处于成熟阶段,须二段天然气则表现出高成熟的特征。川西坳陷孝泉地区、新场地区、合兴场地区δ13c1值和δ13c2-δ13c1值与高庙子地区、丰谷地区δ13c1值和δ13c2-δ13c1值存在明显的差异。这种碳同位素地区差异特征,预示了天然气由孝泉地区、新场地区、合兴场地区向高庙子地区和丰谷地区运移的规律。烃源岩生烃、排烃时期的差异,是该区天然气运移方向的控制因素之一,也是间接造成该区天然气碳同位素差异的原因之一。研究区天然气同源不同期的充注特征,导致了研究区须二段部分样品的碳同位素倒转现象。

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