量化指标在煤层气开发潜力定量评价中的应用

发布时间：2018-05-11 11:07

本文选题：煤层气 + 开发潜力评价　；参考：《石油学报》2017年06期

【摘要】：等温吸附曲线蕴藏了丰富的煤储层信息,对于认识煤层气开发潜力至关重要。为了更好地挖掘等温吸附曲线蕴含的丰富信息,定量评价煤层气开发潜力,首先对不同盆地/地区煤岩等温吸附曲线进行了对比分析,探讨了含气饱和度和临储比比值指标的意义和局限性,在此基础上,提出临储压差、临废压差和有效解吸量3个量化指标,并结合具体实例对其应用效果进行分析和论述。研究表明,含气饱和度和临储比是比值指标,可以用来对比评价不同区块、不同煤层、不同井之间开发潜力的优劣和定性评价煤层气开发潜力;相比而言,临储压差、临废压差和有效解吸量可应用于区块和单井不同层次煤层开发潜力定量评价中,能够更好地反映煤层气开发潜力。实例分析表明,寿阳区块15号煤储层有一定的开发潜力,但因其煤岩吸附时间长(扩散速度低),需在见气后通过较长时间的缓慢排采,实现产气潜力的释放;恩洪EH-C6井需要较长时间的前期排水降压过程,但其开发潜力比较乐观。
[Abstract]:The isothermal adsorption curve contains abundant information of coal reservoir, which is very important for recognizing the potential of coalbed methane development. In order to better excavate the abundant information contained in isothermal adsorption curve and evaluate quantitatively the potential of coal bed methane development, the isothermal adsorption curves of coal and rock in different basins / regions are analyzed and compared. In this paper, the significance and limitation of the indexes of gas saturation and ratio of critical reservoir ratio are discussed. On the basis of this, three quantitative indexes, namely, the critical reservoir pressure difference, the temporary waste pressure difference and the effective desorption amount, are put forward, and their application effects are analyzed and discussed with concrete examples. The results show that gas saturation and reservoir ratio are ratio indexes, which can be used to evaluate the development potential of different blocks, different coal seams, different wells and qualitatively evaluate the development potential of coalbed methane. The critical waste pressure difference and effective desorption amount can be applied to the quantitative evaluation of the development potential of coal seams at different levels in blocks and single wells, which can better reflect the development potential of coalbed methane. The case analysis shows that the No. 15 coal reservoir in Shouyang block has a certain development potential, but because of the long time of coal and rock adsorption (low diffusion rate), it is necessary to release the potential of gas production by slowly discharging gas for a long time. Enhong EH-C6 well needs a long period of pre-drainage and depressurization process, but its development potential is optimistic.
【作者单位】：中国石油大学地球科学学院;油气资源与探测国家重点实验室;中海石油(中国)有限公司非常规油气分公司;中联煤层气有限责任公司;煤层气开发利用国家工程研究中心;中联煤层气国家工程研究中心有限责任公司;
【基金】：国家重大科技专项“滇东黔西煤层气开发技术及先导性试验”(2016ZX05044)资助
【分类号】：TE37

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