Origin, hydrocarbon accumulation and oil-gas enrichment of fault-karst carbonate reservoirs: A case study of Ordovician carbonate reservoirs in South Tahe area of Halahatang oilfield, Tarim Basin

DING Zhiwen,WANG Rujun,CHEN Fangfang,YANG Jianping,ZHU Zhongqian,YANG Zhimin,SUN Xiaohui,XIAN Bo,LI Erpeng,SHI Tao,ZUO Chao,LI Yang

Fig. 2. Characteristics of Ordovician carbonate storage space in the South-Tahe area of the Tarim Basin. (a) Well HD27, 6285.5 m, O2y, light gray arenaceous limestone, with micro-fractures and unfilled cave, core photo; (b) Well Yuke1, 6699.0 m, O2y, a core photo with suture lines and dissolved pores and vugs filled with asphalt; (c) Well HD25, 6498.0 m, O2y, a cast slice of sparry conglomeratic limestone with fractures and intragranular dissolved pores; (d) Well HD27, 6291.0 m, O2y, a core photo shows filler in cave with asphalt; (e) Well YueM22, 7342.4 m, O2y, a cast slice shows a few intergranular and intragranular pores; (f) Well Yuke101, 6498.0-6503.0 m, an imaging logging picture shows high conductivity fractures. (g) Well Yuke201, 6717.0-6719.0 m, an imaging logging picture shows caves and vugs.