中国石油大学学报（自然科学版）2016，Vol.40Issue(6)：33-39,7.DOI:10.3969/j.issn.1673-5005.2016.06.004
盐效应和共同离子效应对方解石溶解度的影响及其地质意义
Effect of salts and common ions on solubility of calcite and its geological implications
摘要
Abstract
Growth and dissolution of minerals in petroleum reservoirs are controlled by the diagenesis fluids. The solubility characteristics of calcite in different salt and ions aqueous systems at stable temperature were investigated using experiments. The experimental results show that the solubility of calcite increases with the salinity rising ( salinity<20%) . However, it de-creases under high salinity condition. And it is found that the fluids in reservoir contain salinity corresponding to the maxi-mum solubility of calcite with high porosity. The solubility of calcite is the highest in MgCl2-H2 O system, middle in NaCl-H2 O system, lowest in KCl-H2 O system at the same mole concentration of salt. This implies that the Mg2+ has stronger salt effect on solubility of calcite than Na+and K+, which improves the dissolution of calcite. The Ca2+shows constraint on dissol-ving of calcite due to the common ion effect;however it may lead to growth of calcite, resulting in improving sealing ability of strata. The salt effect of Na2 SO4 is not remarkable, and the solubility of calcite decreases quickly with Na2 SO4 content in-creasing. The sulfate ion shows more constraint on dissolution of calcite than Cl-, which indicates that it is not suitable for forming of secondary porosity in reservoir containing Na2 SO4 .关键词
方解石/溶解度/生长/盐效应/共同离子效应/储层物性Key words
calcite/solubility/growth/salt effect/common ion effect/reservoir property分类
天文与地球科学引用本文复制引用
陈勇,王淼,刘庆,卓勤功,张学军,陈小兰..盐效应和共同离子效应对方解石溶解度的影响及其地质意义[J].中国石油大学学报（自然科学版）,2016,40(6):33-39,7.基金项目
国家自然科学基金项目(41172111) （41172111）
国家科技重大专项(2016ZX05006-001) （2016ZX05006-001）
中央高校基本科研业务费专项(SD2013211151,16CX05005A) （SD2013211151,16CX05005A）
