鄂尔多斯盆地富县地区碳酸盐岩微相分析

Carbonate Microfacies analysis of Fuxian area in Ordos basin

在综合前人研究成果和已有勘探资料的基础上,分析了鄂尔多斯盆地陕北斜坡东南部的富县地区奥陶系马家沟组马五1~马五5亚段碳酸盐岩的微相类型及特征,通过岩心观察、铸体薄片分析等实验手段,结合岩石类型、沉积结构、构造、古生物等资料,识别出研究区马家沟组主要发育碳酸盐岩台地相的局限-开阔台地亚相。进一步划分出的主要微相类型有:潮坪泥云坪微相,潮坪碎屑滩微相,潮坪岩溶微相,潮坪风暴岩微相,膏云坪微相,灰泥坪沉积微相,潮坪、灰、泥、云混杂沉积微相,并对各微相的展布及演化特征进行了分析。

Based on previous studies and existing exploration data, the study on microfacies types and characteristics of carbonate rocks of Ma5_1~Ma5_2 in Ordovician Majiagou formation was carried out, which is located in the southeast of Shanbei slope in Ordos basin. Through the core observation, casting thin slice analysis and other experimental methods, combined with rock types, sedimentary texture, structure, paleontology and other information, open platform facies which were developed in Majiagou formation were identified. Main microfacies types as follows: the tidal flat set mud microfacies, tidal flat microfacies clastic beach, tidal flat microfacies, karst tidal flat storm microfacies, cream set microfacies, plaster tidal-flat sedimentary microfacies, tidal flat, ash, mud, cloud mixed sedimentary microfacies. The distribution of the microfacies and evolution characteristics were analyzed.