NATURAL GAS OF NEW GENETIC TYPE——BIO-, THERMO-CATALYTIC TRANSITIONAL ZONE GAS

Bio-, thermo-catalytic transitional zone gas (BTCTZ gas), of which burial depth is shallow (1000-2500m), chemical composition (C,/ΣC1-5 = 0.7-0.9) and isotopic composition (δ13C1= -55 to-48‰) coincide with the evolution level of organic matter (R0=0.25-0.6%) in the corresponding strata, is a natural gas of new genetic type. The genesis of BTCTZ gas must have some relation to microcatalysis under lower temperature and condensation of aromatic hydrocarbons. In line with the new theory of natural gas formation, the existence of BTCTZ gas is objective. According to data from all over the world, BTCTZ gas may hold an important position in the table of reserves of natural gas.     

一种新的天然气成因类型——生物-热催化过渡带气

生物-热催化过渡带气是一种新的天然气成因类型。它埋藏浅(1000—2500m),气体的组份(C1/∑C1—C_5,=0.7—0.9)和同位素组成特征(δ~(13)C_1=—55—48‰)与相应层段有机质演化阶段(R。=0.25—0.6％)相符,过渡带气的形成可能与低温微催化作用、芳香烃的缩合作用等有关。过渡带气在自然界客观存在,与天然气形成新理论相一致,借鉴世界资料,它可能在天然气储量平衡表中占有重要份额。