Fracture development and controlling factors at metamorphic buried-hill reservoirs of Bozhong 19-6 gas field in Bohai Bay, East China

Fractures of multi-scales and multi-origins are primary storage space effective seepage channels for metamorphic buried-hill reservoirs. They not only allow communication between various pores to enhance capacity, but also essential high yields. Fracture development controlling factors at reservoirs Bozhong 19-6 Gas Field were investigated based on imaging log, core data, experiments, e.g., thin sections scanning electron microscope, outcrop description. Results show that structural fractures, weathering fractures dissolution developed in the study area, among which most popular ones. However, fracture types varied obviously different structure positions. Lithology, fault, crust ancient landform affecting distribution. prone be lithology with bright mineral contents. Faults characterized by a dual including fault damage zone. density followed decreasing trend increasing distance from faults. Damage zone could identified when was consistent regional density. The width determined such as scale location. Well-connected leached unit, secondary importance. unweathered unit dominated low