For the characteristics that the reserves produced degree and development effect of Ordovician fractured-cavi-ty carbonate rock reservoirs in Tahe oilfield decrease gradually,we use vertical of Karstification and the sublevel develop-ment of Well,first proposed definition of dense layer in fractured-cavity reservoir.And using drilling core,well logging, vertical of Karstification development behavioral characteristics and seismic wave impedance inversion method,estab-lished the distinction criterion of resistive dense layer,studied the distribution of different dense layer in Tahe six&seven district.This technique has been applied to the Tahe Oilfield Development,and it has become one of the most useful meth-ods of fine reservoir description and producing degree of reserves during the current 12th Five-Year Plan.% 针对塔河油田奥陶系碳酸盐岩缝洞型油藏目前储量动用程度低、开发效果变差的特点，以纵向岩溶分带、油井分段开采特征为基础，首次提出缝洞型油藏致密段定义，利用岩心、测井、单井纵向岩溶带分布特征和开发动态特征及地震波阻抗反演等，建立缝洞型油藏高阻致密段划分标准。采用点、线、面相结合技术流程，研究塔河油田6、7区不同致密段分布。该方法已应用到塔河油田开发中，效果较好，成为“十二五”缝洞型油藏精细描述和提高储量动用主要方法之一。
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