Evaluation of Sensitivity Damage Degree of Sandstone Geothermal Reservoir in Lantian Bahe Formation in Guanzhong Area

Based on the petrology characteristics of the sandstone geothermal reservoirfrom Lantian Bahe Formation in the middle and deep layers, Guanzhong area, Shaanxi Province, natural core and artificial core models were used to quantitatively evaluate the damage of geothermal reservoir sensitivity. The results show that the conglomeratic sandstone and medium sandstone belong to medium to strong velocity sensitivity, and the fine sandstone belongs to strong velocity sensitivity. Particle migration is the most important damage type in the exploitation of geothermal reservoir. The conglomeratic sandstone has medium to strong water sensitivity, and the medium sandstone and fine sandstone have strong water sensitivity. Water sensitive damage is also the main type of reservoir damage. The conglomeratic and medium sandstone have strong stress sensitivity, and the fine sandstone has medium to high stress sensitivity. The stress sensitivity is also the main damage type of the reservoir. The acid sensitive damage of the reservoir is weak. The research results provide a theoretical basis for formulating reasonable reservoir protection technical countermeasures in the study area.