The Reservoir Characteristics and Formation ...

YingMai2 area, with typical fracture reservoirs with very low matrix porosity and permeability, is located in the old buried mountain tectonic belt, where faults and fractures are well developed. The main storage spaces are of secondary porosity, such as tectonic fractures and pores, dissolved vugs, holes and cracks. The fracture reservoirs in YingMai2 area are controlled by two factors, tectonic movements of faults and expansion dissolution along fractures. The middle Caledonian, late Caledonian, late Hercynian and late Hercynian-Indosinian faults systems are the main formation mechanisms of the fracture reservoirs in YingMai2 area. The fracture reservoirs are also influenced by expansion dissolution along fractures.