Formation, preservation and connectivity control of organic pores in shale

BORJIGIN Tenger,LU Longfei,YU Lingjie,ZHANG Wentao,PAN Anyang,SHEN Baojian,WANG Ye,YANG Yunfeng,GAO Zhiwei

Fig. 5. Photos showing the bitumen in carbonate rock reservoirs of Changxing Formation in Well PG5 of Puguang Gas Field. (a) Bitumen filling in pores between calcite grains, in sphere shape and dense, with no pores but with contracted fractures; (b) Bitumen filling along the grain boundary fractures, dense, with shrinkage pores.