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Accurate characterization of full pore size distribution of tight sandstones by low‐temperature nitrogen gas adsorption and high‐pressure mercury intrusion combination method
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-09-30 , DOI: 10.1002/ese3.817
Shuaishi Fu 1, 2, 3 , Qi Fang 3 , Aifen Li 2, 3 , Zhiping Li 1 , Jinliang Han 4 , Xu Dang 5 , Wencheng Han 3
Affiliation  

The full pore size distribution represents the integrated characteristics of micro‐nano pore‐throat systems in tight reservoirs. And it involves experiments of different scales to fully analyze the microscope properties. In this paper, we established a new approach for full pore size characterization through conducting the high‐pressure mercury intrusion (HPMI) experiments and low‐temperature nitrogen gas adsorption (LTN2GA) experiments. Meanwhile, we studied the petrology feature of the tight sandstones through X‐ray diffraction (X‐rD) and TESCAN Integrated Mineral Analyzer (TIMA). Then, we investigated the HPMI capillary pressure curves and pore size distribution characteristics, as well as the adsorption‐desorption isotherms features and BET‐specific surface area. Finally, the BJH, non‐local density functional theory (NLDFT) and the quenched solid density functional theory (QSDFT) are contrasted for analyzing the adsorption and pore size distribution characteristics. The HPMI method characterizes the macropores distribution accurately, and the micro/mesopores take up of 14.47% of the total pore spaces. The physisorption isotherms take on the combining shape of type II and IV(a), and the hysteresis loops are like type H3 combined with H4. The BET‐specific surface area is inversely proportional to permeability, and the constant of adsorption heat shows consistence with the analysis results of mineral content. QSDFT can characterize the pore size distribution of micro/mesopores more accurately than the BJH, HPMI, and NLDFT method. By combining the pores narrower than 34 nm calculated from QSDFT method and pores larger than 34 nm calculated from HPMI data with mercury intrusion pressure lower than 42.65 MPa, the full pore size distribution features of tight sandstones are accurately characterized. The micro/mesopores from the new combination method are 3.72% more than that calculated from the HPMI data, and it is of great significance for the accurate pore distribution evaluation and development of tight reservoirs.

中文翻译:

低温氮气吸附和高压压汞联合法精确表征致密砂岩的全孔径分布

完整的孔径分布代表了致密油藏中微纳孔喉系统的综合特征。它涉及不同规模的实验,以全面分析显微镜的性能。在本文中,我们通过进行高压汞入侵(HPMI)实验和低温氮气吸附(LTN 2)建立了一种用于表征全孔径的新方法GA)实验。同时,我们通过X射线衍射(X‐rD)和TESCAN综合矿物分析仪(TIMA)研究了致密砂岩的岩石学特征。然后,我们研究了HPMI毛细管压力曲线和孔径分布特征,以及吸附-解吸等温线特征和BET比表面积。最后,将BJH,非局部密度泛函理论(NLDFT)和淬火固体密度泛函理论(QSDFT)进行了对比,以分析吸附和孔径分布特征。HPMI方法可准确表征大孔的分布,微孔/中孔占总孔隙空间的14.47%。物理吸附等温线呈II型和IV(a)的组合形状,并且磁滞回线类似于H3与H4组合。BET比表面积与渗透率成反比,吸附热的常数与矿物质含量的分析结果一致。与BJH,HPMI和NLDFT方法相比,QSDFT可以更准确地表征微孔/中孔的孔径分布。通过结合使用QSDFT方法计算出的小于34 nm的孔和根据HPMI数据计算出的大于34 nm的孔以及汞侵入压力低于42.65 MPa的孔,可以精确表征致密砂岩的全部孔径分布特征。这种新的组合方法产生的微孔/中孔比从HPMI数据计算得到的微孔/中孔要多3.72%,这对于准确的孔隙分布评估和致密油藏的开发具有重要意义。吸附热常数与矿物质含量分析结果吻合。与BJH,HPMI和NLDFT方法相比,QSDFT可以更准确地表征微孔/中孔的孔径分布。通过结合使用QSDFT方法计算出的小于34 nm的孔和根据HPMI数据计算出的大于34 nm的孔以及压汞压力低于42.65 MPa的孔隙,可以精确表征致密砂岩的全部孔径分布特征。这种新的组合方法产生的微孔/中孔比从HPMI数据计算得到的微孔/中孔要多3.72%,这对于准确的孔隙分布评估和致密油藏的开发具有重要意义。吸附热常数与矿物质含量分析结果吻合。与BJH,HPMI和NLDFT方法相比,QSDFT可以更准确地表征微孔/中孔的孔径分布。通过结合使用QSDFT方法计算出的小于34 nm的孔和根据HPMI数据计算出的大于34 nm的孔以及汞侵入压力低于42.65 MPa的孔,可以精确表征致密砂岩的全部孔径分布特征。新组合方法产生的微孔/中孔比HPMI数据计算的要多3.72%,对准确评价孔隙分布和致密油藏具有重要意义。与BJH,HPMI和NLDFT方法相比,QSDFT可以更准确地表征微孔/中孔的孔径分布。通过结合使用QSDFT方法计算出的小于34 nm的孔和根据HPMI数据计算出的大于34 nm的孔以及压汞压力低于42.65 MPa的孔隙,可以精确表征致密砂岩的全部孔径分布特征。新组合方法产生的微孔/中孔比HPMI数据计算的要多3.72%,对准确评价孔隙分布和致密油藏具有重要意义。与BJH,HPMI和NLDFT方法相比,QSDFT可以更准确地表征微孔/中孔的孔径分布。通过结合使用QSDFT方法计算出的小于34 nm的孔和根据HPMI数据计算出的大于34 nm的孔以及压汞压力低于42.65 MPa的孔隙,可以精确表征致密砂岩的全部孔径分布特征。新组合方法产生的微孔/中孔比HPMI数据计算的要多3.72%,对准确评价孔隙分布和致密油藏具有重要意义。致密砂岩的完整孔径分布特征得到了准确表征。这种新的组合方法产生的微孔/中孔比从HPMI数据计算得到的微孔/中孔要多3.72%,这对于准确的孔隙分布评估和致密油藏的开发具有重要意义。致密砂岩的完整孔径分布特征得到了准确表征。这种新的组合方法产生的微孔/中孔比从HPMI数据计算得到的微孔/中孔要多3.72%,这对于准确的孔隙分布评估和致密油藏的开发具有重要意义。
更新日期:2020-09-30
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