摘要
通过对川东黄龙组古岩溶储层的微量和稀土元素研究，表明不同岩石结构、成分和不同溶蚀强度的岩溶岩及其胶结物的地球化学特征有显著差异，尤其是微量和稀土元素的迁移、富集和分馏效应不仅可用以判别岩溶过程中的流体性质和古水文条件，同时也可作为评价和预测古岩溶储层的重要标志之一。
The Huanglong Formation of Upper Carboniferous is one of the important natural gas reservoirs in Eastern Sichuan. By the synthetical analysis of geochemical characteristics of trace and rare earth elements from different carbonate rocks, karstificated dolostones, karst breccias and carbonate cements, the authors indicate that the reservoirs resulted as a paleokarst during middle late time of Late Carboniferous. The emphasis of this paper is concentrated on the geochemical characteristics of the paleokarst reservoirs, such as abundance of trace and rare earth elements, removing or enriching regularity of the elements, model curve of REE distribution and REE La/Lu or REE δ Ce/ δ Eu in different karstificated rocks and cements. According to the studies mentioned above, it is defined that the geochemical characteristics of different karst lithofacies units are quite different and controlled by primary rocks and physicochemical properties of meteoric vadose of phreatic fluid.
出处
《成都理工学院学报》
CSCD
1997年第1期1-7,共7页
Journal of Chengdu University of Technology
基金
"油气藏地质及开发工程"国家重点实验室基金资助
关键词
古岩溶储层
微量元素
地球化学
稀土族
油气地质
paleokarst reservoir
trace and rare earth elements
geochemical characteristic
Huanglong Formation
Eastern Sichuan
