四川盆地龙岗与元坝气田陆相油气系统差异
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摘要
四川盆地龙岗气田与元坝气田地理位置毗邻,但其陆相层系气源存在差异。根据天然气组分、烷烃气的稳定碳、氢同位素组成特征,将中、上三叠统划分为T_2l—T_3x~(1-2)和T_3x~(3-6) 2个油气系统,前者具有煤成气与油型气混合成因的特点,后者属于单一煤成气;中、下侏罗统也可分为2个油气系统,中侏罗统在2个地区均为自生油型气气藏;下侏罗统在元坝地区是以T_3x~(3-6)为气源的次生煤成气气藏,在龙岗地区属于自生油型气气藏。另外,天然气组分iC_4/nC_4值等于1可作为判识天然气类型的指标,随着干燥系数的增加,iC_4/nC_4值有下降的趋势,在成熟阶段减小速度缓慢,在高、过成熟阶段,快速降低;须家河组甲烷氢同位素值异常偏高,不同于下伏海相和上覆内陆淡水湖相所代表的甲烷氢同位素特征,可为半咸水环境下发育的沉积有机质所形成甲烷的氢同位素提供借鉴。
The Longgang and Yuanba Gasfields are adjacent to each other in Sichuan Basin.However,their terrestrial gas sources are different.According to the characteristics of stable carbon and hydrogen isotope compositions of alkane gases derived from the natural gases,the Middle and Upper Triassic can be divided into two hydrocarbon systems,including T_2l-T_3x~(1-2) and T_3x~(3-6).The former has the characteristics of mixed origin of coal-type gas and oil-type gas,and the latter belongs to coal-type gas.In the lower part of Xujiahe Formation,the origin of oil-type gas is not from underlying marine strata,but from sapropelic organic matter of Xiaotangzi Formation.On the contrary,pressurization of hydrocarbon generation combined with unconformity as well as karst reservoir development,Xiaotangzi Formation can be poured back into weathering crust of Leikoupo Formation as gas source to form upper generation and lower storage reservoirs.Otherwiese,the Middle and Lower Jurassic can also be divided into two hydrocarbon systems,the Middle Jurassic is self-generating gas reservoirs in the both areas of Longgang and Yuanba;In Yuanba area,secondary coal-formed gas reservoir of the Lower Jurassic is derived from the underlying strata of T_3x~(3-6),while the gas reservoir of the Lower Jurassic belongs to self-generating and oil-type gas reservoir in Longgang area.In addition,the value of iC_4 versus nC_4 equal to 1 can be used as an index to judge the type of natural gas.As well as with the increase of dryness coefficient,the value of iC_4 versus nC_4 tends to decrease slowly at mature stage and then rapidly reduce at high and over-mature stage.The hydrogen isotope of methane from the Xujiahe Formation is significantly different from that from the underlying marine facies and overlying inland freshwater lake facies,which can provide a reference for the hydrogen isotope of methane formed by sedimentary organic matter developed in brackish water.
The Longgang and Yuanba Gasfields are adjacent to each other in Sichuan Basin.However,their terrestrial gas sources are different.According to the characteristics of stable carbon and hydrogen isotope compositions of alkane gases derived from the natural gases,the Middle and Upper Triassic can be divided into two hydrocarbon systems,including T_2l-T_3x~(1-2) and T_3x~(3-6).The former has the characteristics of mixed origin of coal-type gas and oil-type gas,and the latter belongs to coal-type gas.In the lower part of Xujiahe Formation,the origin of oil-type gas is not from underlying marine strata,but from sapropelic organic matter of Xiaotangzi Formation.On the contrary,pressurization of hydrocarbon generation combined with unconformity as well as karst reservoir development,Xiaotangzi Formation can be poured back into weathering crust of Leikoupo Formation as gas source to form upper generation and lower storage reservoirs.Otherwiese,the Middle and Lower Jurassic can also be divided into two hydrocarbon systems,the Middle Jurassic is self-generating gas reservoirs in the both areas of Longgang and Yuanba;In Yuanba area,secondary coal-formed gas reservoir of the Lower Jurassic is derived from the underlying strata of T_3x~(3-6),while the gas reservoir of the Lower Jurassic belongs to self-generating and oil-type gas reservoir in Longgang area.In addition,the value of iC_4 versus nC_4 equal to 1 can be used as an index to judge the type of natural gas.As well as with the increase of dryness coefficient,the value of iC_4 versus nC_4 tends to decrease slowly at mature stage and then rapidly reduce at high and over-mature stage.The hydrogen isotope of methane from the Xujiahe Formation is significantly different from that from the underlying marine facies and overlying inland freshwater lake facies,which can provide a reference for the hydrogen isotope of methane formed by sedimentary organic matter developed in brackish water.
引文
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