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车西洼陷北部陡坡发育了大量的碳酸盐岩砂砾岩储集层,该类储集层储集空间类型多样,次生孔隙发育,储集层非均质性严重,不同于其他类型的砂砾岩储集层。针对该区储集层特点,将储集层分为孔隙—裂缝型、裂缝型和孔隙型三种类型,不同储集层采用不同的计算模型。总孔隙度选用中子—密度交会法计算;裂缝孔隙度利用电成像测井或深浅双侧向测井资料计算。由于该区砾岩储集层与砂岩储集层的孔渗特点不同,分类建立了孔隙度—渗透率计算公式;裂缝渗透率利用双侧向测井和电成像测井资料计算;根据试油资料建立了适合本地区总渗透率计算公式。通过对比各渗透率计算模型,建立的地区渗透率经验公式最符合实际情况。
A large number of carbonate sandstone and gravel reservoirs are developed on the steep slopes in the north of Chexi Sag. These reservoirs have various types of reservoir space, secondary porosity and serious reservoir heterogeneity. Different from other types of Sand conglomerate reservoir. According to the characteristics of reservoirs in this area, the reservoirs are divided into three types: pore-fracture type, fracture type and pore type. Different reservoir models adopt different calculation models. Total porosity is calculated by neutron-density cross-correlation method; fracture porosity is calculated using electrical imaging logging or depth-depth bilateral logging data. Because of the different pore-permeability characteristics of conglomerate reservoirs and sandstone reservoirs, the porosity-permeability formula is established by classification. The permeability of fractures is calculated by using double lateral and electrical imaging logging data. According to the test oil Data to establish a formula suitable for the total permeability of the region. By comparing the permeability calculation models, the empirical formulas of permeability in the region are most suitable for the actual situation.