摘要
砂岩储层中有机酸对矿物的溶解和沉淀在很大程度上影响着次生孔隙的发育。研究发现,有机酸之所以能提高石英的溶蚀速率和长石的溶解度,主要是由于在矿物的表面及溶液中形成络合物,有效地降低了矿物表面反应的活化能及溶液中硅、铝离子浓度的结果。有机酸与粘土矿物的吸附或催化反应可抑制长石等其他矿物的溶解。有机酸与CO2一起共同控制着体系中碳酸盐的溶解或沉淀。
In oilgas reservoir rocks, mineral dissolution and precipitation controlled by organic acids can influence the development of secondary pores in a great degree. It was found that organic acids can raise the dissolution rate of quartz and the solubility of feldspar, because the formed complexes not only reduce the activation energy of the reaction on mineral surface, but also reduce the concentrations of silica or aluminum ions in the solution. Through the action of adsorption or catalysis with clay minerals, organic acids can restrain the dissolution of other minerals like feldspar. With CO2, organic acids control the dissolution and precipitation of carbonate in the system.
出处
《地质地球化学》
CAS
CSCD
2003年第3期53-57,共5页
Geology-Geochemistry
