浅谈硫酸盐热化学还原作用与碳酸盐岩储层发育

Thermochemical Sulfate Reduction(TSR) and the Development of Reservoirs

在碳酸盐岩层系热化学硫酸盐还原反应(Thermochemical Sulfate Reduction,TSR)是普遍发生的地质现象,通过对现有资料的研究(主要以川东北地区飞仙关组为例),发现TSR反应是形成高含H2S气藏的重要原因。本文总结了现有研究水平下TSR的反应原理以及参与反应的各个组分,以及TSR对储层,尤其是深部储层的作用(主要以川东北地区飞仙关组为例)。同时,本文提出关于TSR作用仍旧有很多没有解决的问题。如TSR反应体系中固体的硬石膏能否参与反应、TSR反应的阶段性、TSR作用与白云化作用之间是否存在关系,以及TSR反应产物与储层溶蚀机制等。

Thermochemical Sulfate Reduction （TSR）, in carbonate stratum, is a common and widespread geological phenomenon. Through research the now available data and information, especially the data and information of the Feixianguan of Triassic, we find that the TSR is the most significant factor why the reservoirs develop with high contents of H2S. The paper, based on existing research data and information, concludes several issues in TSR including the reaction principle, the reactant and the reaction product of TSR. Also including what and how the TSR alters the reservoir, especially the deep reservoir （based on the data and information of the Feixianguan of Triassic）. At the same time, this paper also put several questions to existing and future research. The possibility of solid anhydrite-hydrocarbon reaction in TSR reaction system, the stages of TSR, the potential connection between TSR and dolomitization, and the relation between the reaction products and reservoir dissolution are all significant issues.