基于孔隙结构和多相渗流能力的鄂尔多斯盆地致密砂岩储层品质分类方法研究

doi:10.11720/wtyht.2025.2425

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Abstract

With the advancement of social economy and science and technology, the demand for oil and gas resources has been increasing in daily life and industry. Tight sandstone reservoirs have been the priority targets for the exploration and production of oil and gas resources. However, there still exist many challenges in assessing the parameters and quality of tight sandstone reservoirs. This study conducted experiments on the physical properties, pore structures, and electrical properties of rock samples from the Taiyuan Formation in the Shenmu gas field of the Ordos Basin. Based on this, it established a porosity-permeability relationship model, a capillary pressure prediction model, and a classification saturation assessment model. Besides, it obtained the relative permeability of gas and water phases, which varied point by point, from wells based on the I-Kr model. This study proposed the factors for assessing reservoir quality, which were applied to the target interval in the study area considering the physical properties, pore structures, and multiphase seepage capacity, yielding satisfactory assessment results. Therefore, the method of this study provides a reliable basis for the log-based assessment of the quality of tight sandstone reservoirs.

Key words： tight sandstone capillary pressure curve reservoir quality relative permeability

Received: 13 October 2023 Published: 26 February 2025

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	Articles by authors
	Feng XU
	Zhao-Wei SI
	Zhong-Kui LIANG
	Chao-Guo TIAN
	Lan LUO
	Yu-Hang GUO

Cite this article:

Feng XU,Zhao-Wei SI,Zhong-Kui LIANG, et al. A method for quality classification of tight sandstone reservoirs in the Ordos Basin based on pore structures and multiphase seepage capacity[J]. Geophysical and Geochemical Exploration, 2025, 49(1): 138-147.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.2425 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I1/138

Basic information of rock samples from X37-2c1 well in Taiyuan Formation

Relationship between porosity and permeability of 15 samples from Taiyuan Formation

Relationship between Stratigraphic factors and porosity for 15 samples from Taiyuan Formation

Relationship between resistivity coefficient and water saturation for 15 samples from Taiyuan Formation

Classification of capillary pressure curves for 15 samples from Taiyuan group

Intersection of stratigraphic factors and median pore throat radius for 15 samples from Taiyuan Formation

Sample predicted capillary pressure curves for Taiyuan Formation

Effectiveness of the prediction of the capillary pressure curve

Example of application of capillary pressure curve prediction for well X37-2C1

Example of continuous gas-water relative permeability calculation based on the I-Kr model

Classification thresholds for physical properties, pore structure and seepage performance of Taiyuan Formation

Factor weight settings

Example of calculation of integrated reservoir quality classification based on pore structure and seepage capacity

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