Application of mapping and dating techniques in the study of ancient carbonate reservoirs: A case study of Sinian Qigebrak Formation in northwestern Tarim Basin, NW China

YANG Hanxuan,HU Anping,ZHENG Jianfeng,LIANG Feng,LUO Xianying,FENG Yuexing,SHEN Anjiang

Fig. 3. Characteristics of tested samples (see Fig. 1b for the sampling position). (a) Hand specimen of sample Q-56-1, thrombolite dolomite with lace structure; (b) corresponding photomicrographs of sample Q-56-1, multi-layer FID along the dissolved fissure edge, and PFCD filling in the center of the dissolved fissure, under plane polarized light; (c) hand specimen of sample Q-58-1-1, thrombolite dolomite with lace structure; (d) corresponding photomicrographs of sample Q-58-1-1, from the edge to the center of the dissolved fissure, FID, BD, SSD and quartz occur in turn, under cross polarized light; (e) photomicrographs of sample Q-58-1-2, thrombolite dolomite with lace structure; (f) hand specimen of sample Q-76-1, spongiostromata dolomite with lace structure and fenestral pores; (g) corresponding photomicrographs of sample Q-76-1, FID at the edge and PFCD and MCD filling in the center of the vugs, under plane polarized light; (h) hand specimen of sample X-151-1, breccia; (i) corresponding photomicrographs of sample X-151-1, rim-like dolomite, SSD and quartz filling between breccia, under cross polarized light. ① HR; ② FID; ③ BD; ④ PFCD; ⑤ MCD; ⑥ SSD and quartz