The controlling factors and distribution prediction of H2S formation in marine carbonate gas reservoir, China
The controlling factors and distribution prediction of H2S formation in marine carbonate gas reservoir, China
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DOI：
10.1007/s11434-007-6022-8
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发表时间：
2007-11
影响因子：
--
通讯作者：
Z. Guangyou;Zhang Shui-chang;Liang Yingbo
中科院分区：
文献类型：
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作者：
Z. Guangyou;Zhang Shui-chang;Liang Yingbo
碳酸盐岩储层中通常含有一定量的钙钛矿，而H2S在碳酸盐岩油气藏中也很常见。目前，高H_2S含量的天然气通常被认为是TSR成因，因此H_2S与硬石膏有着密切的关系。相反，一些含硬石膏的碳酸盐岩不含H2S。近年来的研究表明，H2S只是H2S生成的必要条件。储层孔隙度、地层水中硫酸根离子含量、储层温度、油气水界面、烃类及储层岩石中的某些元素对TSR的发生有很大的控制作用。TSR将烃类还原成H2S、CO2等酸性气体，H2S的生成受TSR产状控制，因此反应空间、硫酸根离子与烃类接触机会、储层温度等因素对TSR反应有很大影响。H2S化学性质相对活泼，仍受重金属离子含量控制。良好的TSR反应条件和H2S保存条件是预测H2S分布的前提。针对高含硫天然气藏的特点，建立了预测模型。硬石膏孔隙型储层地层水富硫酸盐，贫重金属离子。油气在保存条件较好的气藏中充注聚集，后期经历高温，是高含H2S天然气的有利区。
Generally, there are some anhydrites in carbonate reservoir, as H2S is also familiar in carbonate oil and gas reservoirs. Nowadays, natural gas with high H2S concentration is usually considered as TSR origin, so there is close relationship between H2S and anhydrite. On the contrary, some carbonate rocks with anhydrite do not contain H2S. Recently, researches show that H2S is only a necessary condition of H2S formation. The reservoir porosity, sulfate ion content within formation water, reservoir temperature, oil/gas and water interface, hydrocarbon and some elements of reservoir rock have great controlling effects on the TSR occurrence. TSR deoxidizes hydrocarbon into the acidic gas such as H2S and CO2, and the H2S formation is controlled by TSR occurrence, so the relationship among reaction room, the contact chance of sulfate ion and hydrocarbon, the reservoir temperature has great influence on the TSR reaction. H2S has relatively active chemical quality, so it is still controlled by the content of heavy metal ion. Good conditions of TSR reaction and H2S preservation are the prerequisite of H2S distribution prediction. This paper builds a predictive model based on the characteristic of natural gas reservoir with high H2S-bearing. In the porosity reservoir with anhydrite, the formation water is rich in sulfate and poor in heavy metal ion. Oil and gas fill and accumulate in the gas reservoir with good preservation conditions, and they suffered high temperature later, which indicates the profitable area of natural gas with high H2S-bearing.