INFLUENTIAL FACTORS ANALYSIS AND QUANTITATIVE PREDICTION OF OIL-BEARING CHARACTERS OF THE ORIGINAL LITHOLIGICAL RESERVOIRS OF DONGYING DEPRESSION, THE BOHAIWAN BASIN

The oil saturations and occupation percents of original lithological reservoirs can be calculated with the parameters of the capillary pressures at the top of reservoirs,the heights of the sand bodies and the porosities and permeabilities of the reservoir rocks.The curve of capillary pressure of reservoir rock can be attained with the porosity and permeability known,and the oil occupation percent of reservoir is closely attached to the height of sand body.The relations of the capillary pressure at the top of reservoir to the depth or the pressure coefficient of strata is obtained through compositively analyzing the characteristic parameters of the reservoirs in Dongying Depression of the Bohaiwan Basin and its Niuzhuang sub-depression,and the relations can be utilized to forecast the oil-bearing characters of the original lithological reservoirs in stratas of different depths or pressure coefficients with different heights and physical characters of the reservoir rocks.