烷烃气稳定氢同位素组成影响因素及应用
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摘要
为了研究烷烃气氢同位素组成及其影响因素,探讨其在天然气成因和成熟度鉴别上的应用,对118井次鄂尔多斯盆地石炭系—二叠系、四川盆地三叠系及68井次四川盆地震旦系、寒武系以及塔里木盆地奥陶系和志留系天然气的组分、碳氢同位素组成等地球化学特征进行了综合分析。认识如下:①鄂尔多斯盆地石炭系—二叠系和四川盆地三叠系须家河组天然气均以烷烃气为主,前者的干燥系数和成熟度普遍高于后者,而后者的烷烃气稳定氢同位素组成要明显比前者更重;②建立了δ~2HCH_4-C_1/C_(2+3)天然气成因鉴别图版,并提出重烃气与甲烷氢同位素组成之差和烷烃气氢同位素组成相关图可以用来鉴别天然气成因;③在两个盆地分区域建立了煤成气δ~2HCH_4-Ro关系式,提出了煤成气(δ~2HC_2H_6—δ~2HCH_4)-Ro关系式,为煤成气成熟度判别提供了新的指标;④烷烃气稳定氢同位素组成值受到烃源岩母质、成熟度、天然气混合和烃源岩沉积水体介质等多重因素的影响,其中古水体盐度是其中极为关键、重要的一种影响因素。综上,烷烃气氢同位素组成受到多重因素的影响,其在天然气成因、成熟度鉴别以及指示烃源岩沉积水体环境方面具有重要应用价值。图9表2参81
To study the composition, affecting factors of the stable hydrogen isotopes of alkane gases and their application to identification of the natural gas origin and maturities, the chemical and isotopic compositions of 118 gas samples of CarboniferousPermian in the Ordos Basin, and of Triassic in the Sichuan Basin, combined with 68 gas samples from the Sinian and Cambrian reservoirs in the Sichuan Basin, and Ordovician and Siliurian reservoirs of Tarim Basin, are analysed comprehensively. The following conclusions are obtained:(1) Natural gases in the study area and strata of the Ordos and Sichuan basins are dominated by alkane gases, and the dryness coefficients and maturities of the Carboniferous-Permian gases in the Ordos Basin are higher than the gases in the Triassic Xujiahe Formation of the Sichuan Basin, while the hydrogen isotopes of the latter ones are much enriched in 2 H than the former.(2) Theδ~2 HCH_4-C_1/C_(2+3) genetic identification diagram of natural gas was drawn, and the diagrams of hydrogen isotopic differences between the heavy alkane gases and methane vs. hydrogen isotopes of alkane gases can also be used in natural gas genetic identification.(3) Theδ~2 HCH_4-Ro formulas of coal-formed gas in different areas of the two basins are given, and the δ~2 HC_2 H_6-δ~2 HCH_4 is a new index for maturity,and the(δ~2 HC_2 H_6-δ~2 HCH_4)-Ro formula of the coal-formed gas can be used to calculate the maturity of the natural gas.(4) The stable hydrogen isotopes of alkane gases are affected by parent materials in source rocks, maturity, mixing and the aqueous medium conditions,among which the aqueous paleo-salinity is the key factor. To sum up, the hydrogen isotopes of alkane gases are affected by multiple factors, and they are significant to the identification of the origin, and maturity of natural gas, and the water environment during the deposition of source rocks.
To study the composition, affecting factors of the stable hydrogen isotopes of alkane gases and their application to identification of the natural gas origin and maturities, the chemical and isotopic compositions of 118 gas samples of CarboniferousPermian in the Ordos Basin, and of Triassic in the Sichuan Basin, combined with 68 gas samples from the Sinian and Cambrian reservoirs in the Sichuan Basin, and Ordovician and Siliurian reservoirs of Tarim Basin, are analysed comprehensively. The following conclusions are obtained:(1) Natural gases in the study area and strata of the Ordos and Sichuan basins are dominated by alkane gases, and the dryness coefficients and maturities of the Carboniferous-Permian gases in the Ordos Basin are higher than the gases in the Triassic Xujiahe Formation of the Sichuan Basin, while the hydrogen isotopes of the latter ones are much enriched in 2 H than the former.(2) Theδ~2 HCH_4-C_1/C_(2+3) genetic identification diagram of natural gas was drawn, and the diagrams of hydrogen isotopic differences between the heavy alkane gases and methane vs. hydrogen isotopes of alkane gases can also be used in natural gas genetic identification.(3) Theδ~2 HCH_4-Ro formulas of coal-formed gas in different areas of the two basins are given, and the δ~2 HC_2 H_6-δ~2 HCH_4 is a new index for maturity,and the(δ~2 HC_2 H_6-δ~2 HCH_4)-Ro formula of the coal-formed gas can be used to calculate the maturity of the natural gas.(4) The stable hydrogen isotopes of alkane gases are affected by parent materials in source rocks, maturity, mixing and the aqueous medium conditions,among which the aqueous paleo-salinity is the key factor. To sum up, the hydrogen isotopes of alkane gases are affected by multiple factors, and they are significant to the identification of the origin, and maturity of natural gas, and the water environment during the deposition of source rocks.
引文
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