A large volume of secondary pore, cave resulted from admixed sea water dolomitzation of supergene and fluid corrosion during bury improve porosity and permeability of the reserviors.

• 同生-准同生期的混合水云化作用和表生期、埋藏期的流体溶蚀作用则产生了大量的次生溶孔、洞，使储层的孔渗性得到明显的改善；