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Sedimentary Characteristics and Reservoir Significance of Microbial Carbonate in Ma51+2 Member of Ordovician in Northestern Ordos Basin
Author(s): XIONG Ying, YAO Zuoli, LI Ling, HOU Yundong, XIAO Di, NIE Wancai, ZHAO Dongfang, TAN Xiucheng
Pages: 963-
972
Year: 2016
Issue:
5
Journal: Acta Sedimentologica Sinica
Keyword: microbial carbonate; cyanobacteria; microbial mound; Ma51+2; Ordovician; northestern Ordos Basin;
Abstract: 基于岩芯、薄片及物性资料,研究鄂尔多斯盆地东北部奥陶系马五1+2微生物岩沉积特征及其油气储集意义.研究区发育有不同规模的由蓝细菌群落构成的微生物碳酸盐岩建造,由叠层石、菌纹层白云岩、蓝细菌凝块岩以及菌黏结颗粒岩构成了藻坪和微生物丘建造.微生物丘纵向上建造规模较小,单旋回厚度一般小于1 m,发育于潮下高能环境,并由花斑状砂屑云岩、蓝细菌凝块岩、菌黏结砂屑云岩、菌纹层白云岩构成了丘基—丘核—丘坪的向上变浅序列,也常与颗粒滩相伴生构成丘滩复合体.其中,发育于丘核部位的蓝细菌凝块岩和菌黏结砂屑云岩中窗格孔和粒间孔发育,表现为中孔低渗特征,可作为盆地东北部的储集岩之一.
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