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通过对准噶尔盆地腹部石南油气田23个天然气样品组分和稳定碳同位素分析将其分为5种类型:第1类来自中二叠统乌尔禾组偏腐殖型烃源岩的原生热成因气,是石南油气田天然气的主体;第2类包括基001井、基003井、石南4井和石南5井4个样品,混入了少量的生物成因甲烷;第3类丙烷和丁烷碳同位素倒转幅度高达9.6‰,可能发生了细菌对丙烷的选择性降解;第4类天然气乙烷和丙烷碳同位素发生了倒转,可能源自细菌对乙烷的选择性降解;第5类来自下二叠统风城组的油型气,天然气甲烷遭受了细菌的选择性降解。绝大部分受细菌作用影响的样品现今埋深较大,反映可能存在2个阶段的细菌作用过程。
Based on the analysis of 23 natural gas samples and stable carbon isotopes in Shinao oil and gas field in the abdication Junggar Basin, they are divided into five types: the first type is derived from the primary thermal genesis of the Meso-Permian Wuerhe fossil humic source rock Gas is the main body of natural gas in Shimin Oil and Gas Field; the second group includes 4 samples of base well 001, base 003, well Shijin 4 and well Shitan 5 mixed with a small amount of biogenic methane; type 3 propane and butane Carbon isotope reversal amplitude of up to 9.6 ‰, the possibility of bacterial selective degradation of propane; Class 4 natural gas ethane and propane carbon isotope inversion occurred, may be derived from bacterial selective degradation of ethane; Category 5 from the next The oil-gas and natural gas methane in the Permian Fengcheng Formation suffered from the selective degradation of bacteria. The vast majority of samples affected by bacterial action are now buried deeper, reflecting the possible two-stage bacterial process.