碎屑岩中长石的溶解机制及其对成岩作用的贡献  

Dissolution mechanism of feldspar in the clastic rocks and its contribution to diagenesis

作　　者：薛伟伟[1] 谭先锋[1,2] 李泽民[1] 邱雨[1] 雍玉婷 蒋威[1] 

机构地区：[1]重庆科技学院石油与天然气工程学院,重庆401331 [2]复杂油气田勘探开发重庆市重点实验室,重庆401331

出　　处：《复杂油气藏》2015年第1期1-6,61,共7页Complex Hydrocarbon Reservoirs

基　　金：国家自然科学基金项目(41202043);中国石油科技创新基金项目(2014D-5006-0108);国家级大学生科技创新训练项目(201311551001);重庆市教委科学技术研究项目(KJ1401316)

摘　　要：综述前人在碎屑岩中长石溶蚀方面的大量研究成果,从长石的溶蚀环境(开放—封闭)、长石溶蚀的制约因素(成分、结构、p H值、有机酸的类型)等方面深入探讨长石的溶蚀沉淀机制。通过长石颗粒骨架模型、表面反应溶蚀模型、热力学模型建立了有机酸条件下长石的溶蚀沉淀模型,从而讨论长石的溶解对成岩作用的贡献。长石在封闭富钾的环境中多溶蚀形成伊利石,在开放的流体环境中则形成高岭石,同时长石的溶解也是石英次生加大的原因之一;孔隙流体联通情况好,长石溶解形成的副矿物多溶解运移到其他地方,从而改善储层结构,新生石英和粘土矿物亦会对储层骨架起固结作用。This paper reviews a large number of the researches on the dissolution of feldspars in clastic rocks. The mechanism of dissolution and precipitation of feldspars was studied from some aspects such as dissolution environment（ open and closed）,influencing factors（ component,structure,p H value,type of organic acid）,and so on. According to the skeleton model of feldspar particle,the surface reaction dissolution model and the thermodynamic model,the model of dissolution and precipitation for feldspars was built up under the conditions of organic acid. Thus the contribution of feldspar dissolution to diagenesis was discussed. Illite was mostly formed in the closed potassium- rich environment,and kaolinite was formed in open fluid environment. Meanwhile,the dissolution of feldspar was also one of the reasons of quartz overgrowth. Under the condition of good communication of pore fluid,accessory minerals formed by the feldspar dissolution can be dissolved and moved to other place. Thus this improved the structure of clastic reservoir. The neogenic quartz and clay minerals can also play a role in consolidation of reservoir matrix.

关 键 词：碎屑岩 长石 溶蚀 模型 成岩作用 

分 类 号：TE122.2[石油与天然气工程—油气勘探]