CO 2 -Water-Rock Interaction and Pore Structure Evolution of the Tight Sandstones of the Quantou Formation, Songliao Basin

Yue Zhao, Songtao Wu (), Yongjin Chen, Cong Yu, Zhichao Yu, Ganlin Hua, Modi Guan, Minjie Lin and Xiaobo Yu
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Yue Zhao: School of Energy Resources, China University of Geoscience (Beijing), Beijing 100083, China
Songtao Wu: Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
Yongjin Chen: School of Energy Resources, China University of Geoscience (Beijing), Beijing 100083, China
Cong Yu: Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
Zhichao Yu: Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
Ganlin Hua: School of Energy Resources, China University of Geoscience (Beijing), Beijing 100083, China
Modi Guan: Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
Minjie Lin: Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
Xiaobo Yu: Daqing Oil Field Co., Ltd., Daqing 163712, China

Energies, 2022, vol. 15, issue 24, 1-19

Abstract: As an important part of carbon dioxide capture, utilization and storage (CCUS), the progress of injecting CO 2 into oil reservoirs could increase the recovery rate and achieve large-scale carbon storage. It has become one of the most important carbon storage methods around the world. This paper selected the tight sandstone of the fourth member of the Quantou Formation in the southern Songliao Basin to carry out a CO 2 storage physical simulation experiment. Representative samples were collected at 24 h, 72 h, 192 h and 432 h to study the CO 2 water-rock interaction and to analyze the mineral composition, pore structure and the evolutionary characteristics of physical reservoir properties over time. Physical property analysis, Ion analysis, X-ray diffraction mineral analysis, QEMSCAN mineral analysis, scanning electron microscopy and high-resolution CT scanning techniques were adopted. The main points of understanding were: (i) It shows a differential evolution of different minerals following the storage time of CO 2 , and carbonate minerals are mainly dissolved with ankerite as a typical representation; a small amount of calcite is formed in 24 h, and dissolved in the later period; feldspar and quartz were partially dissolved; clay mineral precipitation blocked the pores and gaps; (ii) The evolution in mineral variation leads to the complexity of pore structure evolution, following a trend of “small pores decreasing and large pores increasing” with extending storage time. The final porosity and permeability ratios gradually increase from 4.07% to 21.31% and from 2.97% to 70.06% respectively; (iii) There is a negative correlation between the increasing ratio and the original physical properties of the tight stones due to the dissolution of ankerite. Relevant research could provide scientific guidance and technical support for the geological storage of CO 2 in lacustrine tight continental sandstones and the development of CCUS technology.

Keywords: unconventional oil and gas; tight oil; Fuyang reservoir; CO 2 geological storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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