基于微电阻率成像测井的致密碳酸盐岩孔隙空间参数定量表征技术及其应用

Quantitative Characterization Technique of Tight Carbonate Pore Space Parameters and Its Application Based on Micro-Resistivity Imaging Logging

孔隙空间参数测井定量表征是致密碳酸盐岩储层有效性评价的核心难点。基于致密碳酸盐岩地层特征,通过岩心分析孔隙度、分析渗透率,结合铸体薄片数据、压汞孔喉分布资料刻度电成像测井资料,探索建立一套致密碳酸盐岩孔径分布谱的转换方法,并基于此建立了微孔、细孔、中孔、粗孔、洞5种孔隙组分孔隙度及地层渗透率计算方法,实现了致密碳酸盐岩孔隙空间参数定量表征评价。该技术在鄂尔多斯盆地50多口气探井的致密碳酸盐岩储层中得到良好应用,有助于认识储层、判断储层的有效性,能够快速、精准优选试气射孔井段,可助力新领域、新层系勘探获得重大发现和突破。

Well logging quantitative characterization of pore space parameters is the core difficulty of validity evaluation of tight carbonate reservoirs.According to the characteristics of tight carbonate,the porosity and permeability is analyzed by cores,and micro-resistivity imaging logging data are scaled by combining the cast thin section data and mercury-pressing pore throat distribution data to explore and establish a set of conversion methods for the pore size distribution spectrum of tight carbonate.Based on this,a calculation method of porosity and formation permeability is established for five types of pore components:micro pore,slim pore,middle pore,macro pore and cavity,and a quantitative characterization and evaluation of pore space parameters of tight carbonate is realized.Through over fifty electrical imaging logging application on tight carbonate reservoirs in Ordos basin,quantitative characterization technique of tight carbonate has achieved good results in the reservoir-validity evaluation,precisely perforation zone selection and help the breakthrough of new district and new strata exploration.