柯克亚凝析气田石英的溶解现象及其成因  

A STUDY ON DIRECT DISSOLUTION OF QUARTZ AND ITS GENESIS IN THE KEKEYA GAS CONDENSATE

作　　者：邱隆伟[1] 潘耀[1] 

机构地区：[1]中国石油大学(华东)地球资源与信息学院

出　　处：《矿物学报》2005年第2期183-190,共8页Acta Mineralogica Sinica

基　　金：国家自然基金项目(批准号:49973001)

摘　　要：储层微观特征与成岩演化等的研究表明,柯克亚凝析气田西河甫组储层中广泛存在的石英溶解现象属于石英直接溶解。石英的直接溶解是长期干旱背景下形成的储层,在较深埋藏条件下碱性地层水活动的结果。成岩过程中碱性地层水的形成和原始沉积环境中有机质含量低有关,同时也受成岩演化的制约。早成岩B期—晚成岩期的早期储层中地层水的pH值最高,是研究区储层中石英溶解最强烈的时期,同时也是石英溶解型孔隙最主要的发育期。Quartz dissolution developed in reservoirs in the Kekeya area was determined to be a process of direct dissolution by microscope observation and diagenetic evolution study. Direct dissolution of quartz is the result of alkaline formation water activity in deeper burial reservoirs formed under a long-term arid atmosphere. And the alkaline formation water is due to low organic matter content in sediments and diagenetic evolution the reservoirs experienced, pH reaches its peak value from stage B of early diagenesis to early stage A of late diagenesis, which is also the period of the strongest dissolution of quartz and the dominant forming stage of quartz dissolution pore in the Kekeya area.

关 键 词：石英 直接溶解 成岩环境 柯克亚 塔西南坳陷 

分 类 号：P571[天文地球—矿物学]