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Volume 39 Issue 6
Nov.  2020
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Article Navigation >  Bulletin of Geological Science and Technology  > 2020  >  39(6): 175-184
Zhao Huitao, Guo Yinghai, Du Xiaowei, Hu Yunbing, Kang Rui, Shangguan Jingwen. Micro-pore multifractal characteristics of Benxi Formation sandstone reservoir in Gaoqiao area, Ordos Basin[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 175-184. doi: 10.19509/j.cnki.dzkq.2020.0614
Citation: Zhao Huitao, Guo Yinghai, Du Xiaowei, Hu Yunbing, Kang Rui, Shangguan Jingwen. Micro-pore multifractal characteristics of Benxi Formation sandstone reservoir in Gaoqiao area, Ordos Basin[J]. Bulletin of Geological Science and Technology, 2020, 39(6): 175-184. doi: 10.19509/j.cnki.dzkq.2020.0614
shu

Micro-pore multifractal characteristics of Benxi Formation sandstone reservoir in Gaoqiao area, Ordos Basin

doi: 10.19509/j.cnki.dzkq.2020.0614
  • Received Date: 25 Nov 2019
    Abstract
  • Eleven sandstone samples from Benxi Formation of Upper Paleozoic in Gaoqiao area of Ordos Basin were selected.The lithological characteristics and pore structure characteristics of the reservoir were analyzed based on rock slices and scanning electron microscopy.The distribution data of nuclear magnetic resonance T2 of sandstone samples were studied by using multifractal theory.The pore multifractal characteristics of sandstone reservoir are discussed, and the relationship between multifractal parameters and pore structure parameters, mineral composition and physical properties of sandstone is analyzed.The results show that the sandstones of Benxi Formation are mostly quartz sandstones and lithic quartz sandstones, and the skeleton grains are mainly quartz (63%-85%, with an average of 71.45%)and lithic debris(3%-17.5%, with an average of 10.91%), without feldspar.The cements are mainly kaolinite(3%-10%, with an average of 6.3%) and carbonate cements(0-9%, with an average of 5.65%).The pore size distribution of sandstone reservoir shows obvious multifractal characteristics.The multifractal parameters, Dmin-Dmax, Dmin/Dmax and Δα is between 1.16-1.83, 2.73-6.92 and 1.37-4.33 respectively.Research shows that both α-f(α) multifractal singular spectrum and q-D(q) generalized multifractal parameters can be used to quantitatively characterize the heterogeneity of pore distribution of sandstone reservoirs.The multifractal parameters have weak positive correlation and negative correlation with quartz content and rock debris content respectively, and have obvious negative correlation with cements content.The multifractal parameters are closely related to the permeability of reservoir.With the permeability increasing, the multifractal parameters show the trend of increasing first and then decreasing.Therefore, it is not that the smaller the heterogeneity is, the better the reservoir is.The development of a large number of intercrystalline pores can reduce the heterogeneity of the reservoir, but also greatly restricts the permeability of the reservoir.Relatively large pores are developed and have not undergone strong compaction, cementation and other diagenetic transformation.Reservoirs with weak heterogeneity are favorable areas for oil and gas exploration.

     

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