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准噶尔盆地南缘泥火山天然气的地球化学特征

, PP. 178-190

Keywords: 准噶尔盆地,泥火山,天然气,地球化学特征,气源

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Abstract:

?我国准噶尔盆地南缘发育多处泥火山,1991年6月和2010年8月,两次对准噶尔盆地南缘泥火山进行考察.从气压减小、出气量减少、泥浆池口陷落和泥浆池干涸等变化,可见泥火山活动渐趋衰弱,活动强度明显小于中国台湾一些泥火山.泥火山天然气具有相似的地球化学特征,表明其具有同源性或同因性.泥火山天然气主要组分是烷烃气,含量为91.15%~97.49%,其中甲烷含量最高,是优质商业气;天然气δ13C1值为-49.1‰~-40.6‰,与世界范围内泥火山气δ13C1频率高峰段一致,且烷烃气碳同位素系列具有δ13C1<δ13C2<δ13C3特征,是典型热成因气;研究区泥火山气具有较低的3He/4He值,R/Ra为0.011~0.054,属典型壳源氦;泥火山天然气的δ13C2值均大于?28‰,是典型煤成气,且C1/C1-4和δ13C1值两指标与该盆地下中侏罗统源岩形成的煤成气特征一致,因此,准噶尔盆地南缘泥火山烷烃气的气源主要是下中侏罗统煤系源岩.

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