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通过岩心、录井、测井等资料综合研究,分析了阿尔及利亚438b区块三叠系SerieInferiere段的辫状河沉积特征。采用熵权法,综合考虑孔隙度、砂岩密度、渗透率突进系数、渗透率变异系数、渗透率级差和夹层频率等6种影响储层非均质性的因素,计算了研究区三叠系SerieInferiere段储层平面非均质综合指数,并在沉积相约束下,绘制了储层平面非均质性展布图。该方法充分利用熵权法的弱化和强化,即去同存异的特点,较准确地表征了研究区储层的非均质性。
Based on the comprehensive study of core, logging and logging data, the sedimentary characteristics of braided river in the SerieInferiere section of Triassic in Block 438b, Algeria are analyzed. By means of entropy method, six factors influencing reservoir heterogeneity such as porosity, sandstone density, penetration coefficient, permeability coefficient, permeability gradient and interlayer frequency are comprehensively considered. Based on these factors, the influence of SerieInferiere And the reservoir heterogeneity index is plotted. Under the constraints of sedimentary facies, the reservoir heterogeneity distribution map is plotted. This method makes full use of the weakening and strengthening of the entropy method, that is to say, to the characteristics of the same deposit, and to more accurately characterize the reservoir heterogeneity in the study area.