松辽盆地深层天然气碳同位素反序及形成机理探讨
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摘要
松辽盆地深层天然气碳同位素反序现象十分普遍,对其成因的认识一直存在分歧。全面分析、总结了松辽盆地深层昌德、徐深、升平、长岭4个具有碳同位素反序现象的烷烃气组分以及碳同位素组成,结果认为深层烷烃气组分与同位素值不具备典型无机成因气特征,其负碳同位素系列不能作为鉴别无机成因气的充分条件。深层煤成气与无机气混合作用可能是碳同位素反序的首要因素,运移过程中的扩散分馏是导致混源模拟与实际测量值出现偏差的主要原因,且制约着盆地深层天然气组分及碳同位素值垂向变化。此外,盆地深层单纯无机成因气组分与碳同位素组成是准确估算深层非生物成因气含量的关键,其研究具有重要理论意义与应用价值。
Carbon isotope in reverse order is usually observed in deep gases of Songliao Basin,but there has been a long disagreement about its mechanism.Multi-analysis has been performed for the alkane gas composition and carbon isotope composition of deep gases from Changde,Xushen,Shengping and Changling gas reservoirs in Songliao Basin showing reverse order of carbon isotope.The result indicates that the composition and isotope value of deep alkane gas do not have the characteristics of typical abiogenic gas,and only negative carbon isotope series is not sufficient to identify inorganic origin.The hybridization of deep coal gas and inorganic gas probably contributed to carbon isotopic reversal in the first place.The difference between simulation and measurement is primarily caused by diffusive fractionation during migration,which also controlled the vertical variation of deep gas composition and carbon isotope value in the basin.In addition,pure abiogenic gas composition and carbon isotope composition are key parameters for accurate estimation of inorganic gas content in the deep formation of the basin.The result of this research is of important theoretical significance and application value.
Carbon isotope in reverse order is usually observed in deep gases of Songliao Basin,but there has been a long disagreement about its mechanism.Multi-analysis has been performed for the alkane gas composition and carbon isotope composition of deep gases from Changde,Xushen,Shengping and Changling gas reservoirs in Songliao Basin showing reverse order of carbon isotope.The result indicates that the composition and isotope value of deep alkane gas do not have the characteristics of typical abiogenic gas,and only negative carbon isotope series is not sufficient to identify inorganic origin.The hybridization of deep coal gas and inorganic gas probably contributed to carbon isotopic reversal in the first place.The difference between simulation and measurement is primarily caused by diffusive fractionation during migration,which also controlled the vertical variation of deep gas composition and carbon isotope value in the basin.In addition,pure abiogenic gas composition and carbon isotope composition are key parameters for accurate estimation of inorganic gas content in the deep formation of the basin.The result of this research is of important theoretical significance and application value.
引文
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[3]王先彬,郭占谦,妥进才,等.中国松辽盆地商业天然气的非生物成因烷烃气体[J].中国科学(D辑:地球科学),2009,39(5):602-614.
[4]Potter J,Konnerup-Madsen J.A review of the occurrenceand origin of abiogenic hydrocarbons in igneous rocks[J].Geological Society,London,Special Publications,2003,214:151-173.
[5]Proskurowski G,Lilley M D,Seewald J S,et al.Abio-genic hydrocarbon production at lost city hydrothermalfield[J].Science,2008,319:604-607.
[6]Wei Z F,Zou Y R,Cai Y L,et al.Abiogenic gas:shouldthe carbon isotope order be reversed?[J].Journal of Pe-troleum Science and Engineering,2012,84(85):29-32.
[7]倪云燕,戴金星,周庆华,等.徐家围子断陷无机成因气证据及其份额估算[J].石油勘探与开发,2009,36(1):35-45.
[8]黄海平.松辽盆地徐家围子断陷深层天然气同位素倒转现象研究[J].地球科学——中国地质大学学报,2000,25(6):617-623.
[9]戴金星.天然气中烷烃气碳同位素研究的意义[J].天然气工业,2011,31(12):1-6.
[10]倪云燕,靳永斌.费托合成反应中的碳同位素分馏[J].石油勘探与开发,2011,38(2):249-256.
[11]Charlou J L,Donval J P,Fouquet Y,et al.Geochemis-try of high H2 and CH4 vent fluids issuing from ultramaficrocks at the Rainbow hydrothermal field(36°4'N,MAR)[J].Chemical Geology,2002,191(4):345-359.
[12]储雪蕾,樊祺诚,刘若新,等.中国东部新生代玄武岩中超镁铁质捕虏体的CO2包裹体的碳、氧同位素初步研究[J].科学通报,1995,40(1):62-64.
[13]钱丽萍,王旭.五大连池地区泉水气体地球化学特征[J].人民长江,2007,38(11):188-191.
[14]Beeskow B,Treloar P J,Rankin A N,et al.A reassess-ment of models for hydrocarbon generation in the Khibinynepheline syenite complex,Kola Peninsula,Russia[J].Lithos,2006,91:1-18.
[15]李春园,王先彬,夏新宇.甲烷及其同系物δ13C值反序排列特征的数值模拟与非生物成因天然气藏探讨[J].沉积学报,1999,17(2):306-311.
[16]程付启,金强.成藏后天然气组分与同位素分馏效应研究[J].天然气地球科学,2005,16(4):522-525.
[17]史基安,卢龙飞,王金鹏,等.天然气运移物理模拟实验及其结果[J].天然气工业,2004,24(12):32-34.
[18]刘季花,石学法,卜文瑞.稳定同位素地球化学[M].北京:海洋出版社,2002:201-259.