沉积与特提斯地质2025，Vol.45Issue(2)：268-281,14.DOI:10.19826/j.cnki.1009-3850.2024.10005
塔里木盆地塔河地区上寒武统下丘里塔格组白云岩储层的热液改造效应
Hydrothermal transformation of the Lower Qiulitage Formation dolomite reservoirs in the Upper Cambrian,Tahe area,Tarim Basin
摘要
Abstract
Hydrothermal dolomitization plays an important role on reservoir formation and evolution.Based on core and thin section examination,this study classifies the Upper Cambrian Lower Qiulitag dolostone in the Tahe area.Furthermore,elemental and isotopic geochemical analyses are employed to decipher the origins of various types of dolostones in the study area,aiming to evaluate the contribution of hydrothermal activity to reservoir evolution.Two types of matrix dolostones and dolomite cements of two stages are identified:very finely to finely crystalline matrix dolostone(D1),medium to coarsely crystalline matrix dolostone(D2),saddle dolomite cements with dull luminescence in the core(SD-1),and saddle dolomite cements with bright luminescence in the rim(SD-2).D1 is interpreted to have formed during shallow burial diagenesis,while D2 is interpreted as resulting from recrystallization during burial diagenesis.SD-1 is likely formed by local redistribution during burial diagenesis,whereas the rim of saddle dolomites(SD-2)formed through alteration by subsequent hydrothermal fluids.Consequently,we propose that the contribution of hydrothermal alteration to porosity enhancement seems negligible,with hydrothermal fluids largely confined to fractures and vugs.关键词
塔河地区/下丘里塔格组/白云岩/热液流体/地球化学特征Key words
Tahe area/Lower Qiulitage Formation/dolostone/hydrothermal/geochemical characteristics分类
天文与地球科学引用本文复制引用
尚凯,徐勤琪,叶宁,耿锋,刘明铭..塔里木盆地塔河地区上寒武统下丘里塔格组白云岩储层的热液改造效应[J].沉积与特提斯地质,2025,45(2):268-281,14.基金项目
中石化科研项目塔北-塔中震旦-寒武系成藏条件与区带优选(P22123) （P22123）
