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Volume 42 Issue 4
Nov.  2023
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Article Navigation >  CARSOLOGICA SINICA  > 2023  >  42(4): 809-818
JI Shaocong, ZHANG Qingyu, LIANG Bin, LI Jingrui, BA Junjie, NIE Guoquan, DONG Hongqi, MO Guochen. Experimental simulation of dissolution to dolomite in formation water of Jixianian Wumishan Formation in the Xiong'an New Area[J]. CARSOLOGICA SINICA, 2023, 42(4): 809-818. doi: 10.11932/karst20230414
Citation: JI Shaocong, ZHANG Qingyu, LIANG Bin, LI Jingrui, BA Junjie, NIE Guoquan, DONG Hongqi, MO Guochen. Experimental simulation of dissolution to dolomite in formation water of Jixianian Wumishan Formation in the Xiong'an New Area[J]. CARSOLOGICA SINICA, 2023, 42(4): 809-818. doi: 10.11932/karst20230414
shu

Experimental simulation of dissolution to dolomite in formation water of Jixianian Wumishan Formation in the Xiong'an New Area

doi: 10.11932/karst20230414
  • 1.

    Institute of Karst Geology, CAGS/Key Laboratory of Karst Dynamics, MNR & GZAR, Guilin, Guangxi 541004, China

  • 2.

    International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Guilin, Guangxi 541004, China

  • 3.

    Pingguo Guangxi, Karst Ecosystem, National Observation and Research Station, Pingguo, Guangxi 531406, China

  • Received Date: 2022-04-27
    Abstract
  • With the richest geothermal resources and the best development and utilization conditions in the central and eastern China, the Xiong'an New Area is the home of three large and medium-sized geothermal fields—Xiongxian, Rongcheng and Gaoyang. The Jixianian Wumishan Formation in the Xiong'an New Area has good reservoir endowment, large water yield and easy reinjection, which is the focus of geothermal resource exploration. At present, acid solutions, high-salinity water solutions or sea water which are prepared by researchers themselves are mainly used in simulation experiments, but less formation water is used as the experimental fluid. In this study, the dolomite of Wumishan Formation in the Xiong'an New Area is taken as the research object, and the formation water of Wumishan Formation in the underground is taken as the experimental fluid. The dissolution simulation experiment under high temperature and high pressure has been carried out to analyze the influence of temperature, pressure, lithology, structure and other factors on the dissolution of dolomite. This experiment adopts the simulation experimental device of dissolution kinetics under the conditions of high-temperature and high-pressure independently designed by Karst Geology Research Institute of the Chinese Academy of Geological Sciences. The formation water from the whole section of Wumishan Formation in the geothermal well of the Xiong'an New Area is taken as the reaction fluid. At the same time, considering the two factors of temperature and pressure, a total of 12 groups of experiments in the range of 40 ℃, 10 MPa to 150 ℃, 20 MPa have been carried out to simulate the dissolution of formation water of Wumishan Formation in the Xiong'an New Area on dolomite from the shallow burial to the deep burial. The experimental results show that dissolution rates of samples in the formation water decreased with the increase of temperature in general. The rates experienced a rapid decrease before a slow increase and then a rapid decrease again, with an obvious increase from 100 ℃ to 140 ℃. Dissolution rates of samples in formation water increased obviously with the increase of pressure. The variation of Ca2+ and Mg2+ concentrations with temperature and pressure was consistent with that of dissolution rates with temperature and pressure. All samples showed a certain degree of corrosion under the experimental conditions, mainly the corrosion of the sample surface. The samples with less developed pores and microcracks only corroded on the surface, which blurred the sample surface. The samples with developed pores and microcracks were eroded and expanded along intergranular pores, intercrystalline pores and various fractures, and finally connected to a certain extent. Therefore, the results of this study show that the buried dissolution of carbonate rocks will decrease in the burial diagenetic environment, with the increase of depth and temperature. But there is a window with higher dissolution capacity in the range of 100 ℃-140 ℃, which may be a favorable temperature range for the formation of dolomite karst reservoirs in the Wumishan Formation in the study area. For the samples with undeveloped pores and microcracks, it is difficult for soluble fluid to enter the sample for large-scale corrosion, but only to stay on and blur the sample surface during the experiment. The samples with pores and microcracks developed are corroded and expanded along intergranular and intercrystalline pores and various fractures and fissures, and are finally connected to a certain extent.

     

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