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. 2. Photographs of sedimentary breccia in upper member of Lower Ganchaigou Formation of Yingxi area. (a) Well S41-6-1, 3857.7-3 857.9 m, sedimentary breccia, with mud impregnation on surface, various sizes of gravel, sandy- and muddy-matrix and anhydrite, calcite authigenic mineral filling between gravels; (b) Well S41-6-1, 3 857.78 m, microphotograph of sedimentary breccia, with sandy- and muddy-matrix and anhydrite, calcite authigenic mineral filling between gravels. The gravels are angular, with local weak rounding. There are a small number of dissolved holes and micro-cracks, polarized light.