收稿日期: 2007-06-15
修回日期: 2007-08-05
网络出版日期: 2007-10-10
STUDY ON THE MECHANISM AND ACCUMULATION EFFECT OF THERMOCHEMICAL SULFATE REDUCTION IN NORTHEAST AREA OF SICHUAN ABSIN
Received date: 2007-06-15
Revised date: 2007-08-05
Online published: 2007-10-10
在碳酸盐岩层系热化学硫酸盐还原反应（TSR）是普遍发生的地质现象，一定厚度的 硬石膏、充足的烃类和较高的古地温是TSR反应发生的必备条件，但TSR反应是十分复杂的 化学反 应，应用简单的化学平衡方程并不能完全表达该反应的过程。通过烃类与硬石膏反应的活 化 能分析可知，TSR反应是一个优先消耗重烃的过程。通过对川东北地区飞仙关组钻井岩心和 薄片观察、地球化学分析表明，TSR反应是形成高含H2S气藏的重要原因。指出TSR反应的 成藏效应在于：①TSR反应本身是个储层矿物体积减小的过程，有利于深部储层产生次生孔 隙；②TSR反应生成的流体对储层具有一定的溶蚀作用，可促进次生孔隙的生成；③TSR反应 优 先消耗重烃，使天然气藏干燥系数增加，烃类碳同位素变重，同时引起了硫同位素分馏。认 为研究TSR反应机理及成藏效应，对川东北地区碳酸盐岩层系飞仙关组高含H2S气藏的勘探 具有重要的意义。
陈志勇, 李启明, 夏斌 . 川东北地区热化学硫酸盐还原反应机理及成藏效应研究[J]. 天然气地球科学, 2007 , 18(5) : 743 -749 . DOI: 10.11764/j.issn.1672-1926.2007.05.743
Thermochemical sulfate reduction was normal geological phenomena in se dimentary basins.The anhydrite,hydrocarbon and high strata temperature were th ree absolutely necessary conditions.We could not use some simple chemical equil ibrium equations to express total reaction process because the TSR were of very complicated chemical reactions.Based on the analysis on activation energy betwe en anhydrite and hydrocarbon,we known that heavy hydrocarbons were first consum ed in TSR process.After observation of abundant well cores and slices and geoch emical analysis in Feixianguan formation of northeast area of Sichuan Basin,the result showed that it is the most important reason to reduce gas pool with high H2S content in this area.The accumulation effects of TSR were ①TSR could g enerate secondary porosity in deep reservoir because itself was a shrinking proc ess; ② The resultants of TSR were corrosive to reservoir and they could acceler ate secondary pore system; ③ the heavy hydrocarbons were consumed first in TSR process,so this increased the dryness coefficient of natural gas,made the hydroc arbon isotopic heavier,and conduced the sulfur isotopic fractionation.In a wor d,it is important meaning to study the mechanism and accumulation effect of the rmochemical Sulfate Reduction in northeast area of Sichuan basin.
Key words： Northeast of Sichuan basin; The mechanism of TSR; Accumulation effect; H2S
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