Magmatic hydrothermal fluid genesis of zeolite in the Paleogene Kongdian Formation of Zaoyuan oilfield, Bohai Bay Basin, China

HAN Guomeng,WANG Li,XIAO Dunqing,LOU Da,XU Muyue,ZHAO Yonggang,PEI Yanlu,GUO Xiaowen,TENG Jiancheng,HAN Yuanjia

Fig. 2. Photos of the core from Well Z56. (a) 2404.70- 2404.90 m, core of mudstone with fracture vein; (b) 2404.70 m, bitumen and mineral vein filling in the fracture on the cross-section of the core top; (c) 2404.80 m, locally enlarged photograph of fracture vein, showing calcite filling in the contraction crack of bitumen, natrolite filling in the vein; (d) 2404.90 m, two sets of high angle longitudinal joints associated with the fracture, bitumen and white mineral vein on the cross section at the bottom of the core; (e) 2404.85 m, hydrothermal minerals such as pyrite and acicular natrolite on the longitudinal joints of mudstone.