刘建, 徐莹, 赵智鹏, 关小曲, 余梦南. 生物气源岩评价指标体系研究[J]. 海洋地质前沿, 2015, 31(1): 16-23. DOI: 10.16028/j.1009-2722.2015.01003
    引用本文: 刘建, 徐莹, 赵智鹏, 关小曲, 余梦南. 生物气源岩评价指标体系研究[J]. 海洋地质前沿, 2015, 31(1): 16-23. DOI: 10.16028/j.1009-2722.2015.01003
    LIU Jian, XU Ying, ZHAO Zhipeng, GUAN Xiaoqu, YU Mengnan. RESEARCH OF THE EVALUATION INDICATOR SYSTEM FOR BIOGENIC GAS SOURCE ROCKS[J]. Marine Geology Frontiers, 2015, 31(1): 16-23. DOI: 10.16028/j.1009-2722.2015.01003
    Citation: LIU Jian, XU Ying, ZHAO Zhipeng, GUAN Xiaoqu, YU Mengnan. RESEARCH OF THE EVALUATION INDICATOR SYSTEM FOR BIOGENIC GAS SOURCE ROCKS[J]. Marine Geology Frontiers, 2015, 31(1): 16-23. DOI: 10.16028/j.1009-2722.2015.01003

    生物气源岩评价指标体系研究

    RESEARCH OF THE EVALUATION INDICATOR SYSTEM FOR BIOGENIC GAS SOURCE ROCKS

    • 摘要: 生物成因气资源潜力巨大,具有分布广、埋藏浅、易预测、勘探成本低等优点,作为天然气水合物的主要气源,是一种重要的天然气资源。其生成机理与生油以及热解产气机理有着明显的区别,形成条件也存在着特殊性,许多评价生油岩以及过成熟气的指标并不适用于生物气源岩生气能力的评价。通过分析生物成因气形成演化特征及控制因素,建立了生物气源岩生气能力评价指标体系及评价标准。生物气生成的主要控制因素是可供产甲烷菌等微生物群体可利用的物质条件以及适宜微生物生长活动的地质地球化学环境条件2个方面,有机质碳、氯仿沥青"A"、有机酸、有机质类型以及镜质体反射率是生物气源岩物质条件的评价指标;沉积速率、地层温度、Pr/Ph和Cl-含量是反映地质环境的评价指标;腐泥组分含量、PME、咔唑类化合物、甾烷/藿烷、nC21-/nC22+等能够反映微生物活动及其强度的指标可作为生物气源岩评价的参数。

       

      Abstract: Biogenetic gas has advantages of huge resource potential, wide distribution, shallow buried depth and low cost for exploration. It is an important natural gas resource as well as the main source of natural gas hydrate. The generation mechanism of biogenetic gas is obviously different from that of the hydrocarbon and pyrolysis gas. The formation condition also has some particularities. So many indicators usually used for evaluation of oil source rocks and overmature gas are unserviceable for the evaluation of gas generation capability of biogenic gas source rocks. The paper establishes the evaluation indicator system and evaluation criteria of gas generation capability of biogenic gas source rocks through the analysis of formation and evolution characteristics of biogenic gas and controlling factors. The main control factors of biogas formation include the material conditions that can be used by microbial population like methanogenic bacteria and the environmental conditions that are suitable for growth and activity of microbe. Organic carbon, chloroform "A", organic acid, organic matter types and vitrinite reflectance can be the evaluation indicators of material conditions of biogenic gas source rocks. The sedimentation rate, formation temperature, Pr/Ph and the content of Cl- are the evaluation indicators to reflect the geologic environment. The content of Sapropelinite, PME, carbazole compounds, the ratio of sterane and hopane and the ratio of nC21- and nC22+ are the indicators reflect the activity and intensity of microbe and can be used as the evaluation parameters for biogenic gas source rocks.

       

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