Practice and theoretical and technical progress in exploration and development of Shunbei ultra-deep carbonate oil and gas field, Tarim Basin, NW China

MA Yongsheng,CAI Xunyu,YUN Lu,LI Zongjie,LI Huili,DENG Shang,ZHAO Peirong

Fig. 7. Main reservoir spaces of Ordovician fault-controlled fracture-cavity reservoirs in the Shunbei oil and gas field. (a) Well Shunbei 2, 7736.85 m, Yingshan Formation with bioclastic micrite and micro-fracture network; (b) Well Shunbei 1-7, 7325.15 m, Yijianfang Formation with biogenic detrital micrite and micro-fractures; (c) Well Shunbei 5-1X, 7481.38-7481.61 m, Yijianfang Formation containing micrite and the dissolution fractures which are half-filled with calcite; (d) Shunbei Well 42X, 7413.56-7413.62 m, sand-bearing micritic limestone with high-angle fractures; (e) Well Shunbei 7 drilling loss location, and imaging logging showing fractures and semi-filled caves (black low-resistance part).