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根据我国发育高含硫化氢气所在地层组合类型和特点等,可把其成因归纳为以下几种: 1.还原型:H_2S是由于硫酸盐在烃类或有机质参与下的高温化学还原作用产物,其形成可用以下反应式概括之: 2C+CaSO_4+H_2O→CaCO_3+H_2S+CO_2 (1) ∑CH+CaSO_4→CaCO_3+H_2S+H_2O (2) (1)式中C为生油岩中有机化合物的碳;(2)式中∑CH为烃气(C_nH_(2n+2)),或为石油(LHC),或者两者皆有。显然,这种成因的硫化氢只能发育于硫酸盐-碳酸盐型地层组合中,由于该地层组合中硫的来源丰富,所以就能形成硫化氢高或很高的气(藏)。
According to the types and characteristics of stratigraphic assemblages where high H2S is developed in our country, the causes can be summarized as follows: 1. Reduced type: H 2 S is the product of high temperature chemical reduction of sulfate with the participation of hydrocarbons or organic matter. The formation can be summarized by the following reaction formula: 2C + CaSO_4 + H_2O → CaCO_3 + H_2S + CO_2 (1) ΣCH + CaSO_4 → CaCO_3 + H_2S + H_2O (1) where C is the carbon of organic compound in the source rock ; (2) where ΣCH is hydrocarbon gas (C_nH_ (2n + 2)) or petroleum (LHC), or both. Obviously, hydrogen sulfide of this origin can only develop in the sulphate-carbonate formation. Because of the rich source of sulfur in this formation, gas with high or very high hydrogen sulphide can be formed.