Eogenetic karst and its control on reservoirs in the Ordovician Majiagou Formation, eastern Sulige gas field, Ordos Basin, NW China

XIE Kang,TAN Xiucheng,FENG Min,WANG Baobao,ZHONG Shoukang,YANG Mengying,NIE Wancai,QIAO Zhanfeng,ZENG Wei

Fig. 7. Upward-shallowing sequence and overall brecciation of section 3623.68-3625.49 m in Well T44. (a) Breccia dolomite, micrite dolomite filling between breccias, ordinary thin slice, single polarized light; (b) breccia dolomite, micrite dolomite filling between breccias, ordinary thin slice, single polarized light; (c) breccia dolomite, the breccias are light gray and dark gray, the space between breccias is filled with mud and quartz etc, ordinary thin slice, single polarized light; (d) micrite dolomite, rich in mud, ordinary thin slice, single polarized light.