Since it is difficult to identify microscopic petrographic features of calcite dissolution, we take, pure calcite as the research object, and base on the Fuyu reservoir geological conditions of Songliao basin to study the calcite dissolution characteristics and geological significance through acetic acid-calcite interaction experiments. Results show the followings. Ccalcite is found of having different scale dissolutions and mass losses in different temperatures; ion concentration show regular changes, with Ca²⁺ ion concentration being 684.68~1255.25 mg/L, HCO₃^- ion concentration 2239~3821 mg/L, salinity 3088~5456 mg/L; calcite dissolution microscopic features include residual cone, residual fine crystal imbricate arrangement, dentate residual cone, tumor residual cone, residual sharp cone, etc.; under the acetic acid condition the most suitable temperature for calcite dissolution is 100~130℃. This study provides a certain theoretical basis for the identification of geological features of calcite dissolution reservoir and the function of reservoir into rock, and secondary porosity prediction.

calcite  /  dissolution characteristics  /  dissolution temperature  /  acetic acid