By making use of log data and geological information

analyzing lithologic characteristics

the physical and electric behavior

the oil-gas bearing potential of reservoir rocks as well as their relations with each other

it is possible to establish the corresponding relations between log data and geological information. According to these relations

every well and every formation was analyzed and calculated so as to obtain precise reservoir parameters of the target formation in a block. The most important parameters include: shallness

mineral ingredients in the rock framework

the mean value of grain size

porosity

permeability .oil-saturation and the available thickness of the reservoir. The vertical andplanar distribution of the parameters reveals directly the variation property of reservoir's heterogeneity

porosity and permeability as well as oil and gas distribution.