Genesis of lacustrine carbonate breccia and its significance for hydrocarbon exploration in Yingxi region, Qaidam Basin, NW China

Yanqing WANG,Zhanguo LIU,Guangyong SONG,Yongshu ZHANG,Chao ZHU,Senming LI,Peng WANG,Pengcheng TANG

Fig. 4. Photographs of fault breccia in upper member of Lower Ganchaigou Formation of Yingxi area. (a) Well S3-1, 4 382.14-4 382.44 m, core photo, fault breccia, the surrounding rock breaking into breccia, with cracks and holes partially filled by anhydrite between breccias, Note oil in cracks and holes; (b) Well S3-1, 4 383.04-4 383.29 m core photo, argillaceous lime-dolomite at the bottom, with large dip angle and high angle cracks; (c) Well S43, 3 913.15-3 913.35 m, core photo, fault breccia, argillaceous lime-dolomite breaking into breccia, with cracks and holes partially filled or full-filled by anhydrite between breccias; (d) Well S3-1, 4 374.76 m, photomicrograph of fault breccia, with cracks and holes partially filled by anhydrite between breccias, blue cast slice, polarized light; (e) Well S43, 3913.05 m, photomicrograph of fault breccia, with cracks and holes partially filled by anhydrite between breccias, blue cast slice, polarized light.