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Rapid Determination of Complete Distribution of Pore and Throat in Tight Oil Sandstone of Triassic Yanchang Formation in Ordos Basin, China
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2020-06-26 , DOI: 10.1111/1755-6724.13881 Shuheng DU 1 , Yongmin SHI 2
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2020-06-26 , DOI: 10.1111/1755-6724.13881 Shuheng DU 1 , Yongmin SHI 2
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This study aimed to investigate the complete distribution of reservoir space in tight oil sandstone combining casting slices, field emission scanning electron microscopy (FE‐SEM), the pore‐throat theory model, high‐resolution image processing, mathematical statistics, and other technical means. Results of reservoir samples from the Xin'anbian area of Ordos Basin showed that the total pore radius curve of the tight oil sandstone reservoir exhibited a multi‐peak distribution, and the peaks appeared to be more focused on the ends of the range. This proved that pores with a radius of 1–50,000 nm provided the most significant storage space for tight oil, indicating that special attention should be paid to this range of the pore size distribution. Meanwhile, the complete throat radius curve of the tight oil sandstone reservoir exhibited a multi‐peak distribution. However, the peak values were distributed throughout the scales. This confirmed that the throat radius in the tight oil sandstone reservoir was not only in the range of hundreds of nanometers but was also widely distributed in the scale approximately equal to the pore size. The new rapid determination method could provide a precise theoretical basis for the comprehensive evaluation, exploration, and development of a tight oil sandstone reservoir.
中文翻译：
鄂尔多斯盆地三叠系延长组致密油砂岩中孔喉完全分布的快速测定
这项研究旨在研究致密油砂岩中储层空间的完整分布，包括铸片，场发射扫描电子显微镜（FE-SEM），孔喉理论模型，高分辨率图像处理，数学统计和其他技术手段。鄂尔多斯盆地新安边地区储层样品结果表明，致密油砂岩储层的总孔隙半径曲线呈现多峰分布，且峰值集中在该范围的两端。这证明半径为1–50,000 nm的孔为致密油提供了最重要的存储空间，表明应特别注意该范围的孔径分布。与此同时，致密油砂岩油藏的完整喉径曲线呈现多峰分布。但是，峰值分布在整个刻度上。这证实了致密油砂岩储层中的喉道半径不仅在数百纳米的范围内，而且还以大致等于孔径的规模广泛分布。这种新的快速确定方法可以为致密油砂岩储层的综合评价，勘探和开发提供精确的理论依据。
更新日期：2020-06-26
中文翻译：
鄂尔多斯盆地三叠系延长组致密油砂岩中孔喉完全分布的快速测定
这项研究旨在研究致密油砂岩中储层空间的完整分布，包括铸片，场发射扫描电子显微镜（FE-SEM），孔喉理论模型，高分辨率图像处理，数学统计和其他技术手段。鄂尔多斯盆地新安边地区储层样品结果表明，致密油砂岩储层的总孔隙半径曲线呈现多峰分布，且峰值集中在该范围的两端。这证明半径为1–50,000 nm的孔为致密油提供了最重要的存储空间，表明应特别注意该范围的孔径分布。与此同时，致密油砂岩油藏的完整喉径曲线呈现多峰分布。但是，峰值分布在整个刻度上。这证实了致密油砂岩储层中的喉道半径不仅在数百纳米的范围内，而且还以大致等于孔径的规模广泛分布。这种新的快速确定方法可以为致密油砂岩储层的综合评价，勘探和开发提供精确的理论依据。
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