Characteristics of parametamorphic rock reservoirs in Pingxi area, Qaidam Basin, NW China

Zhiyuan XIA,Zhanguo LIU,Senming LI,Yongshu ZHANG,Bo WANG,Mingzhi TIAN,Jin WU,Kaizhen ZOU

Fig. 5. Photographs of rocks formed by metamorphism in Pingxi area. (a) Well Dp17, 4 342.0 m, Ordovician, crystalline limestone, calcite in directional arrangement, dissolution pores along layers, single polarized light, casting thin section; (b) Well Dp17, 4 558.6 m, Ordovician, calc-schist, weathering fragmentation, directionless fractures, core photograph; (c) Well Dp172, 4 601.2-4 604.0 m, black-gray calc-schist, fragmentation zone caused by tectonic fragmentation, high angle, near vertical, core photograph; (d) Well Dp17, 4 342 m, crystalline limestone, dissolution microspores, scanning electron microscopy photograph.