碎屑岩骨架颗粒溶解的热力学模型及地质意义  

Thermodynamics Model for Dissolution of Petrogenetic Minerals of Clasolite and Its Geological Significances

作　　者：张萌[1] 黄思静[1] 冯明石[2] 王琦[2] 黄裕雄[2] 董少峰[2] 彭美丽[2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]成都理工大学地球科学学院,四川成都610059

出　　处：《地球科学与环境学报》2006年第4期21-25,共5页Journal of Earth Sciences and Environment

基　　金：中国石油天然气股份公司长庆油田分公司综合研究项目

摘　　要：基于热力学平衡原理,探讨了不同温压条件下,碎屑岩在成岩过程中各种骨架颗粒溶解相关的9个反应吉布斯自由能增量和平衡常数的计算结果说明:各种骨架颗粒(钾长石、钠长石、钙长石以及铁镁暗色矿物中的辉石、角闪石等)在成岩过程中的稳定性都较弱,抗溶蚀能力都不高;铁镁暗色矿物和中基性斜长石在碎屑岩的成岩条件酸性介质中,比酸性斜长石和碱性长石更易发生溶解,形成次生溶蚀孔隙,为油气的储集和运移提供空间和通道。According to equilibrium principle of thermodynamics, this paper calculates the increment of Gibbs free energy（△G） and equilibrium constant（K） of the nine chemical reactions for dissolution of petrogenetic minerals of clasolite related to elastic diagenesis under different temperatures and pressures. The result of calculation shows that these petrogenetic minerals（i, e. K-feldspar, albite, anorthite, pyroxene and hornblende）related to elastic di agenesis have comparatively weak stability to fight corrosion;The femic dark minerals, neutral and basic plagio clase are much more easy to dissolute and even to appear more secondary interstice in acid solution than acid pla gioclase and alkali feldspar, which can offer space and passageway for reservoir rock.

关 键 词：碎屑岩 骨架颗粒 溶解 热力学模型 地质意义 

分 类 号：P578.6[天文地球—矿物学] O795[天文地球—地质学]