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Experimental Study on Water-rock Reactions with co2 fluid in a Deep Sandstone Formation under High Temperature and Pressure

引用

Acta Geologica Sinica(English Edition) 2021年第1期95卷 268-279页

作者： LI Chengze CHEN Guojun LI Chao TIAN Bing SUN Rui SU Long LU Yingxin WANG Lijuan Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Petroleum Resources Research Gansu ProvinceLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Inner Mongolia University of Science and Technology BaotouInner Mongolia 014000China CNOOC Research Institute co. Ltd.Beijing 100028China

Qiongdongnan Basin has a tectonic geological background of high temperature and high pressure in a deep reservoir setting,with mantle-derived co2.A water-rock reaction device was used under high temperature and high pressure conditions,in conjunction with scanning electron microscope(SEM)observations,to carry out an experimental study of the diagenetic reaction between sandstone at depth and co2-rich fluid,which is of great significance for revealing the dissolution of deep clastic rock reservoirs and the developmental mechanism of secondary pores,promoting deep oil and gas *** this study,the experimental scheme of the water-rock reaction system was designed according to the parameters of the diagenetic background of the deep sandstone reservoir in the Qiongdongnan *** groups of single mineral samples were prepared in this experiment,including K-feldspar samples,albite samples and calcite *** co2 as a reaction solution,a series of diagenetic reaction simulation experiments were carried out in a semi-closed high temperature and high pressure simulation system.A field emission scanning electron microscope(SEM)was used to observe the microscopic appearance of the mineral samples after the water-rock reaction,the characteristics of dissolution under high temperature and high pressure,as well as the development of secondary *** experimental results showed that the co2-rich fluid has an obvious dissolution effect on K-feldspar,albite and calcite under high temperature and high *** the three minerals,the main temperature and pressure window for dissolution ranged from 150℃to 300℃and 45 MPa to 60 *** electron microscope observations revealed that the dissolution effect of K-feldspar is most obvious under conditions of 150℃and 45 MPa,in contrast to conditions of200℃and 50 MPa for albite and *** the comparative analysis of experimental conditions and procedures,a coupling effect occurred between the temperature

关键词： deep reservoir high temperature and pressure co2-rich fluid dissolution Qiongdongnan Basin

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