Quantitative Calculation Model for the Secondary Porosity of Sandstone Based on Mineral Dissolution Experiment and Its Application

ZHANG Pengfei; WANG Chengjun; QIU Yibo; NI Rui; ZHAO Huizhen; CHEN Yong

doi:10.15898/j.ykcs.202404200091

Rock and Mineral Analysis > 2025 > 44(2): 277-287. > DOI: 10.15898/j.ykcs.202404200091

ZHANG Pengfei，WANG Chengjun，QIU Yibo，et al. Quantitative Calculation Model for the Secondary Porosity of Sandstone Based on Mineral Dissolution Experiment and Its Application[J]. Rock and Mineral Analysis，2025，44（2）：277−287. DOI: 10.15898/j.ykcs.202404200091

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Quantitative Calculation Model for the Secondary Porosity of Sandstone Based on Mineral Dissolution Experiment and Its Application

1.
Research Institute of Exploration and Development Shengli Oilfield Company Sinopec, Dongying 257015, China
2.
State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, China

More Information

Received Date: April 19, 2024
Revised Date: December 02, 2024
Accepted Date: December 05, 2024
Available Online: January 13, 2025
Published Date: January 13, 2025

Abstract

HIGHLIGHTS
(1) The experimental simulation of mineral dissolution was carried out under the conditions of actual reservoir temperature, pressure and formation water chemical composition.

(2) A quantitative mathematical model of sandstone dissolution porosity based on mineral solubility, seepage rate and burial time is established.

(3) The prediction results of the quantitative calculation model of sandstone secondary porosity have good correlation with the actual phenomena.

ABSTRACT

The formation mechanism and quantitative evaluation of secondary pore is the key problem for deep sandstone reservoirs. The experiments on dissolution-precipitation behavior of formation water and minerals in reservoirs were carried out by using high temperature and pressure geochemical experimental simulation system based on the present temperature and pressure conditions of Minfeng sub-sag in Dongying depression and the corresponding formation water characteristics. The experimental results show that under the current formation water and temperature pressure conditions, quartz and plagioclase could undergo dissolution, and the solubility increased with the increase of temperature, while calcite underwent cementation, and its growth rate changed little with the increase of temperature, generally concentrated at around 70×10⁻³g/L. Based on the experimental simulation results, taking into account factors such as permeability flow velocity, precipitation velocity, burial time, porosity and other factors of the formation, a mathematical model of secondary porosity due to dissolution of sandstone reservoirs was established. According to the mathematical model calculation, the CaCl₂ water type at 171℃ in Feng 8 well had the maximum contribution value of 2.52% to the physical properties of the reservoir, which was the most favorable water type and temperature for the development of secondary porosity zone within the simulation depth range of this well. The model calculation showed that the seepage rate was the main factor affecting the development of secondary dissolution pores. Combined with the diagenetic phenomenon of actual reservoirs in Feng 8 well, it had good correlation and obvious dissolution of quartz and feldspar, development of carbonate minerals in the form of cementation and metasomatism, which was consistent with the experimental simulation results. Based on mineral solubility, mineral content, reservoir temperature and pressure conditions and formation water chemistry, the quantitative calculation model established in this paper can predict the deep secondary pore development zone.
- sandstone,
- solubility of mineral,
- precipitation velocity,
- water-rock interaction,
- dissolution pore

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References (32)

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