| 无机与有机混合成因的天然气藏 |
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| 引用本文： | 金强,荣启宏.无机与有机混合成因的天然气藏[J].矿物岩石,1999,19(3):41-45. |
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| 作者姓名： | 金强 荣启宏 |
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| 作者单位： | [1]石油大学（华东）资源科学系 [2]胜利油田纯梁采油厂 |
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| 基金项目： | 石油科技中青年创新基金资助项目 |
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| 摘 要： | 东营凹陷西南部花沟地区发现的二氧化碳气藏，多数专家认为是幔源气，本文通过该区高青断裂下降盘的一个二氧化碳藏与其上倾方向上的一生物甲烷气藏的对比研究，认为它们都是无机与有机混合成因的气藏，二氧化碳质量分数较高的气藏幔源气为主，混有少量有机成因气；生物甲烷气藏以有机成因气为主，混有少量无机气，根据碳同位素组成和稀有气体同位素组成分析，认为研究区不存在纯的幔源气，文中还对这些气藏的形成进行了分析。
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| 关 键 词： | 天然气藏 无机成因气 有机成因气 混合作用 |
NATURAL GAS RESERVES MIXED FROM INORGANIC ANDORGANIC SOURCES |
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| Jin Qiang,Rong Qihong,Wan Congli.NATURAL GAS RESERVES MIXED FROM INORGANIC ANDORGANIC SOURCES[J].Journal of Mineralogy and Petrology,1999,19(3):41-45. |
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| Authors: | Jin Qiang Rong Qihong Wan Congli |
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| Institution: | Jin Qiang 1 Rong Qihong 2 Wan Congli 1 |
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| Abstract: | Interaction of inorganic and organic matter always exists in subsurface of sedimentary basins. Although inorganic gases from mantle could be trapped in reservoirs in the sedimentary basins, the gases would be interacted and exchanged with around materials, especially the source rocks or organic gases. Meanwhile, an organic gas trapped in a reservoir could be mixed with inorganic gases resulted from volcano eruption in the surrounding area. Therefore, we always find the gas reserve mixed from inorganic (or mantle) and organic origins in sedimentary basin, instead of pure mantle gases. A case study in the southwest Dongying Depression is presented in this paper with available arguments. There is a normal deep cut fault named the Gaoqing Fault, which was formed in early Tertiary. A high concentrated CO 2 reserve was formed in E s 3 sandstone at the down side of the Gaoqing Fault, which was mainly derived from mantle and mixed with small quantity of organic gases from the around source rocks. A biogenetic gas reserve was found in E s 1 limestone at the upper part of the Gaoqing Fault, which was mixed with small quantity of mantle gases. As the gases from different origins were interacted and mixed for along time, their composition, isotope constitution were complicated. Data of carbon isotope composition of CO 2 and CH 4, helium isotope composition and so on are provided and discussed. |
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| Keywords: | natural gas reserve inorganic gas mantle CO 2 organic gas mixing the Dongying Depression |
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