INFLUENTIAL FACTORS ANALYSIS AND QUANTITATIVE PREDICTION OF OIL-BEARING CHARACTERS OF THE ORIGINAL LITHOLIGICAL RESERVOIRS OF DONGYING DEPRESSION, THE BOHAIWAN BASIN
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摘要: 利用油藏顶部毛管压力大小、砂体高度以及砂体的孔隙度和渗透率等参数,就可以控制原生岩性油藏的含油饱和度和油气充满度等含油性特征。通过砂岩的孔隙度和渗透率参数,可以得到与砂岩含油饱和度相关的储层岩石毛细管压力曲线变化的特征;砂体的高度与砂体的油气充满度密切相关;油藏顶部毛管压力与围岩所在层位的深度及异常压力大小有关。通过对渤海湾盆地东营凹陷以及其中的牛庄洼陷实际的原生岩性油藏的综合分析,得到了油藏顶部毛管压力随深度或压力系数的变化规律;通过这一变化规律可以预测处于不同深度或压力系数围岩处的不同高度和物性特点的原生岩性砂体的含油性。Abstract: 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.
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