The Sealing Efficiency for N atural Gas by the Hydrocarbon Concentration Caprock and Its Significance
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摘要: 本文在烃浓度盖层封闭机理及其形成地质条件分析的基础上，通过烃浓度盖层封闭能力形成时期的确定，利用其与气源岩排气门限的匹配关系，探讨了烃浓度盖层封闭天然气的有效性。烃浓度盖层封闭能力形成时期只有早于或相近于气源岩排气门限时，才能有效地封闭气源岩排出呈分子扩散相运移的天然气；否则其封闭的有效性变差。并以松辽盆地三肇凹陷青山口组烃浓度盖层对下伏侏罗系气源岩天然气封闭的有效性为例进行分析，阐明其在天然气远景资源评价中的重要意义。Abstract: Bused 0n the sealing mechanism of the hydrocarbon concentration caprock and its geological condi-ti on s, and bymeans of determiing the period that the sealing ability of hydrocarbon concentration caprock formedsource rocks, and investigating the matching relationship of that with the gas expulsion period ofauthors have disscussed the sealing efficiency of the hydrocarbon concentrationcaprock, i. e.，only the sealing period is earlier than or near the expulsion period of sourcerocks can the hydrocarbon concentration caprock seal the gas expelled by source rocks in diffusive phase,if notthe sealing efficiency of the hydrocarbon concentratio n caprock is bad. This paper analysed the efficiencyof the hydrocarbon concentration caprock of the Qingsankou formation mudstone which seals the gasfrom Jurassic system and expounded the significance of sealing efficiency in the evaluation of gasprospectrve resources.
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