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Geochemical Characteristics and Genesis of Oil-Derived Gas in the Jingbian Gas Field, Ordos Basin, China

机译：鄂尔多斯盆地靖边气田石油衍生气的地球化学特征与成因

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摘要

The source rocks of natural gas of the Jingbian gas field in Ordos Basin, China, are unclear, and the origin of oil derived gas is controversial. On the basis of a series of experiments on source rock evaluation, including total organic carbon, Rock-Eval pyrolysis, carbon isotope composition of kerogen, chloroform bitumen A, maceral compositions, and gas chromatograms, we evaluated the hydrocarbon generation potential of the possible source rocks. We also conducted the components and stable carbon isotopes of natural gas and compared geochemical characteristics of natural gas and source rock-adsorbed gas. The results indicate that source rocks from the Lower Permian Taiyuan Formation have some hydrocarbon generating capability but far less than its proximate Carboniferous and Permian coal measures. Oil-derived gas originated from Lower Permian Taiyuan Formation limestone was expulsed to the Majiagou Formation by coal-derived gas generated from the Carboniferous and Permian coal measures, as indicated by source rock evaluation, adsorbed gas, and geochemical characteristics of gas collected from the limestone-developed area. The former two gases mixed in the Majiagou Formation above the gypsum salt bed, which corresponds to the geochemical characteristics of gas from the above gypsum-salt bed. Source rocks from the Majiagou Formation above the gypsum-salt bed experienced much more weathering, leaching, and oxidation compared to those under the gypsum salt bed, suggesting that the latter are comparatively better than the former. As a result of the barrier of the gypsum-salt bed, source rocks of the Majiagou Formation under the gypsum-salt bed can generate a self-stored natural gas reservoir, as indicated by adsorbed gas and geochemical characteristics of gas from under the gypsum-salt bed. Natural gas of the Jingbian gas field is mainly from the Carboniferous and Permian coal measures, with limited oil-derived gas from the Taiyuan Formation.
机译：中国鄂尔多斯盆地靖边气田天然气的烃源岩尚不清楚，石油成因也存在争议。在一系列评估烃源岩的实验的基础上，包括总有机碳，岩石-热解，干酪根的碳同位素组成，氯仿沥青A，化学组成和气相色谱图，我们评估了可能烃源的生烃潜力岩石。我们还进行了天然气的组成和稳定的碳同位素分析，并比较了天然气和烃源岩吸附气体的地球化学特征。结果表明，下二叠统太原组烃源岩具有一定的生烃能力，但远小于其近石炭纪和二叠纪煤系。石炭纪和二叠纪煤系产生的煤成气将源自下二叠统太原组石灰岩的石油气驱散到马家沟组，如烃源岩评价，吸附气和从石灰岩中收集的天然气的地球化学特征所表明的那样-发达地区。前两种气体在石膏盐床上方的马家沟组混合，这与上述石膏盐床上方的气体的地球化学特征相对应。与石膏盐层下的那些相​​比，石膏盐层之上的马家沟组的烃源岩经历了更多的风化，浸出和氧化作用，这表明后者比前者更好。由于石膏盐床层的屏障，石膏盐床层下的马家沟组烃源岩可以产生自储天然气藏，这表现为来自石膏层下方的气体的吸附气体和地球化学特征。盐床。靖边气田的天然气主要来自石炭纪和二叠纪煤田，太原组的石油衍生天然气有限。

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  • 来源
    《Energy & fuels》 |2017年第10期|10432-10441|共10页
  • 作者

    Han Wenxue; Tao Shizhen; Hou Lianhua; Yao Jingli;

  • 作者单位

    PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China;

    PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China;

    PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China;

    PetroChina Changqing Oilfield Co, Explorat & Dev Res Inst, Xian 710021, Shaanxi, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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