Shallow gas reservoirs are distributed widely in Chinese heavy oil-bearing basins. At present, shallow gas resources have opened up giant potentials. The previous researches indicate the intimate genetic relationship between shallow gas and heavy oil. Shallow gas resources are generated from crude oil degraded by anaerobic microscopic organism, it belongs to biogenic gas family of secondary genesis, namely heavy oil degraded gas. Shallow gas resources are usually distributed in the upward position or the vicinity of heavy oil reservoirs. They are mainly of dry gas, which are composed of methane and only tiny C +2 heavy hydrocarbon and relatively higher contents of nitrogen gas. Generally, methane isotopes are light, whose values are between biogenic gas and thermal cracking gas. Ethane isotopes are heavy, which mixed possibly with thermogenic gas. Carbon dioxide bear the characteristics of very heavy carbon isotope, so carbon isotopic fractionation effects are very obvious on the process of microscopic organism degradation crude oil. The heavy oil degraded gas formation, a very complex geological, geochemical and microbiological geochemical process, is the result of a series of reactions of organic matter-microbes and water-hydrocarbon, which is controlled by many factors.
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TSR对深部碳酸盐岩储层的溶蚀改造——四川盆地深部碳酸盐岩优质储层形成的重要方式 总被引：54，自引：16，他引：54
四川盆地海相层系发现的大气藏部含或高舍硫化氢,都发育一定厚度的优质储层,而且优质储层与硫化氢分布具有密切的关系,即气藏硫化氢含量越高,储层性质越好,气藏产能也越大。研究发现,在 TSR(硫酸盐热化学还原反应)过程中,随着膏质岩类的溶解(为 TSR 反应提供 SO_4~(2-)),使储集孔隙初步得到改善;而 TSR 产生的硫化氢溶于水形成的氢硫酸,具有强烈腐蚀性,加速了储层中白云岩的溶蚀,形成孔隙极其发育的海绵状孔洞体系,并呈层状分布。电镜下可以清晰看到白云石晶面的溶蚀坑及溶孔中 TSR 产生的硫磺晶体。溶孔中自生碳酸盐的碳同位素在-10.3‰～18.2‰,而地层碳酸盐的碳同位素在 3.7‰～ 0.9‰,证实了 TSR 过程中有机-无机的相互作用,即有机成因烃类中的碳转移到次生碳酸盐岩中。包裹体分析表明,次生方解石中的包体富含硫化氢,且均一温度多数在160℃以上,具备 TSR 发生的温度条件;硫化氢和硫磺的硫同位素比地层硫酸盐的硫同位素偏轻8‰左右,是 TSR 作用的证据。因此高含硫化氢气藏的优质储层是在早期埋藏溶蚀作用的基础上,后期发生 TSR 及其形成的酸性流体对深埋碳酸盐岩储层再次进行深刻改造和强烈溶蚀作用的结果;同时可以运用硫化氢来预测碳酸盐岩优质储层的分布。 相似文献
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GuangYou Zhu ShuiChang Zhang WenZhi Zhao ZhengJun Wang YingBo Liang XueFeng Zhao JingYan Zhang 《中国科学D辑(英文版)》2008,51(1):96
Shallow gas reservoirs are distributed widely in Chinese heavy oil-bearing basins. At present, shallow gas resources have opened up giant potentials. The previous researches indicate the intimate genetic relationship between shallow gas and heavy oil. Shallow gas resources are generated from crude oil degraded by anaerobic microscopic organism, it belongs to biogenic gas family of secondary genesis, namely heavy oil degraded gas. Shallow gas resources are usually distributed in the upward position or the vicinity of heavy oil reservoirs. They are mainly of dry gas, which are composed of methane and only tiny C 2 + heavy hydrocarbon and relatively higher contents of nitrogen gas. Generally, methane isotopes are light, whose values are between biogenic gas and thermal cracking gas. Ethane isotopes are heavy, which mixed possibly with thermogenic gas. Carbon dioxide bear the characteristics of very heavy carbon isotope, so carbon isotopic fractionation effects are very obvious on the process of microscopic organism degradation crude oil. The heavy oil degraded gas formation, a very complex geological, geochemical and microbiological geochemical process, is the result of a series of reactions of organic matter-microbes and water-hydrocarbon, which is controlled by many factors. 相似文献
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Zhu GuangYou Zhang ShuiChang Zhao WenZhi Wang ZhengJun Liang YingBo Zhao XueFeng Zhang JingYan 《中国科学:地球科学(英文版)》2008,51(1):96-106
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