Cambrian faults and their control on the sedimentation and reservoirs in the Ordos Basin, NW China

WEI Guoqi,ZHU Qiuying,YANG Wei,ZHANG Chunlin,MO Wuling

Fig. 14. Characteristics of reservoirs in the micro-paleo-geomorphologic high positions at the margins of the Cambrian sags in the Ordos Basin. (a) Cast thin section of oolitic dolomite from the platform margin oolitic shoal facies of Zhangxia Formation, taken from the depth of 4 108.8 m in Well Xuntan1; (b) Single polar view of oolitic dolomite section, with bright crystal cementation and dissolved pores developed in Zhangxia Formation taken from the depth of 4 098.3 m in Well Ling1; (c) Single polar view of oolitic dolomite of Zhangxia Formation, taken from the depth of 3 728.0 m in Well Ningtan1, with intragranular dissolution pores, interparticle dissolution pores, and intercrystalline solution pores.