摘要
以库车坳陷克拉苏构造带白垩系巴什基奇克组为研究层段,分别通过层间泥岩硼元素含量和碳酸盐胶结物流体包体显微测温,对不同成岩期地层流体盐度进行示踪对比。由于自沉积初始至埋藏成岩期碳酸盐胶结阶段,研究层段经历一段较为稳定的构造时期,再加上沉积及构造疏导体系的缺失,地层流体始终缺乏大规模交换与改造,不同成岩场之间水-岩体系在这一阶段呈现出一定的封闭性特征,使得研究层段在碳酸盐胶结期孔隙流体盐度时空分异较好地延续了同沉积期水体盐度的分异规律,这种延续性不仅体现在平面上,也体现在垂向上。研究层段在碳酸盐胶结期后经历了强烈的构造活动,但由于断层的封堵并未对流体介质进行有效的疏导,先期形成的碳酸盐胶结分异规律因而未受到明显干扰,从而呈现出同沉积地层水体盐度时空分异特征造就了埋藏成岩期碳酸盐胶结作用的时空分异规律。
Cretaceous Bashijiqike Formation in Kelasu structure zone, Kuqa depression, was selected as study stratigraphic unit. Salinity of syndepositional water body was acquired based on analysis of content of 'B' in mudstone in Bashijiqike Formation. Salinity of intenstitial fluid during burial diagenesis stage was identified on the basis of detailed micro-thermometry analysis of fluid inclusions in carbonate cement. It was noteworthy that the lateral and vertical distribution rules of salinity of interstitial fluid during burial diagenesis stage were similar to that of salinity of syndepositional interstitial fluid, because of stabilization of structure setting and absence of sedimentary and structure carrier system. So the fluid-rock system were not changed obviously by exogenous fluid. It was concluded that fluid-rock system. And later tectonic active hadn't disturbed the differentiation of carbonate cementation. The characteristic of spatio-temporal differentiation of salinity of syndepositional water, controlled the extent of carbonate cementation during burial diagenesis stage.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2009年第10期2351-2362,共12页
Acta Petrologica Sinica
基金
国家重点基础研究发展计划(2006CB202304)资助.
