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Natural Gas Exploration and Development >

2024 , Vol. 47 >Issue 3: 23 - 31

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2024.03.003

RESOURCES EXPLORATION

Reservoir characteristics and influencing factors of Lower Permian Shan-2 Member, northern Ordos Basin: A case study of Wellblock A in Dongsheng gas field

  • WANG Qiong
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  • Exploration and Development Research Institute, Sinopec North China E&P Company, Zhengzhou, Henan 450006, China

Revised date: 2024-05-07

  Online published: 2024-06-27

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Abstract

In order to identify the reservoir characteristics and influencing factors of the second member of Lower Permian Shanxi Formation (referred to as Shan-2 Member) in Wellblock A of Dongsheng gas field, northern Ordos Basin, the petrological and physical characteristics, reservoir spaces and pore structure properties are qualitatively and quantitatively analyzed by means of grain size analysis, thin section identification, mercury injection test, and physical property testing. The main factors affecting reservoir physical properties are discussed from the aspects of sedimentation and diagenesis. The results are obtained as follows. (i) The Shan-2 Member in Wellblock A belongs to the deposition of braid river delta plain. The reservoir rocks are composed of medium- to coarse-grained lithic quartz sandstones and quartz sandstones, with the interstitial materials of argillaceous hybrid matrices and cements (carbonate cements, clay mineral cements, and siliceous cements). (ii) The reservoir features ultra-low porosity and permeability, with the pore types comprising mainly intergranular and intragranular dissolved pores, as well as a few of residual intergranular pores and microfractures. The pores and the throats are dominated by micropores and small-medium throats, respectively, resulting in a pore-throat combination of micropores and small-medium throats. (iii) The reservoir physical properties are jointly controlled by sedimentation and diagenesis. There presents a significant positive correlation between the reservoir physical properties and rock grain size. The mid-channel bar located in the distributary channel is the most favorable sedimentary microfacies. (iv) Destructive diagenesis (i.e. mechanical compaction and cementation) is the major factor reducing the porosity of reservoir, while constructive diagenesis (i.e. dissolution and fracture) significantly improves the porosity and permeability of sandstone.

Key words： Ordos Basin; Dongsheng gas field; Early Permian; Shanxi Formation; Reservoir characteristics; Sedimentation; Diagenesis

Cite this article

WANG Qiong . Reservoir characteristics and influencing factors of Lower Permian Shan-2 Member, northern Ordos Basin: A case study of Wellblock A in Dongsheng gas field[J]. Natural Gas Exploration and Development, 2024 , 47(3) : 23 -31 . DOI: 10.12055/gaskk.issn.1673-3177.2024.03.003

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