西温庄碳酸盐岩地热储层五性关系研究

Five-property Relationship of Carbonate Geothermal Reservoir in Xiwenzhuang

目前国内外对地热地质理论、勘探与评价的研究相对滞后于地热能开发利用的需要。基于岩心实验分析数据,对太原盆地西温庄地热田碳酸盐岩储层分别进行了岩性、物性、电性及含水性与储热性之间的关系分析。研究表明,膏岩是碳酸盐岩地热储层的优势岩性;裂缝发育对于提升碳酸盐岩储层渗透率至关重要;声波时差与热导率和热扩散率呈负相关,与比热容呈正相关;在开采前期可动流体饱和度大的储层出水量大,但随着热导率和热扩散率的降低和比热容的增大,储层温度汇聚作用减弱,在地热开发时一定要注意储层的热恢复周期和注采平衡。

At present,the research on geothermal geological theory and exploration and evaluation technology at home and abroad lags behind the needs of geothermal energy development and utilization.Based on the analysis data of core experiment,the relationship between lithology,physical property,electrical property,water bearing property and heat accumulation property of carbonate reservoir in Xiwenzhuang geothermal field of Taiyuan basin was analyzed.The study shows that gypsum is the dominant lithology of carbonate geothermal reservoir;fracture development is very important to enhance the permeability of carbonate reservoir;acoustic moveout is negatively correlated with thermal conductivity and thermal diffusivity,and positively correlated with specific heat capacity;in the early stage of exploitation,the reservoir with large movable fluid saturation has a large water yield,but with the decrease of thermal conductivity and thermal diffusivity and the increase of specific heat capacity,the convergence of reservoir temperature will be weakened.During geothermal development,attention must be paid to the thermal recovery cycle and injection production balance of the reservoir.