低孔低渗砂泥岩储层分类评价方法

CLASSIFYING AND EVALUATING METHODS FOR THE SAND- SHALE RESERVOIRS WITH LOW POROSITY AND LOW PERMEABILITY

大庆长垣扶余油层为砂泥岩低孔、特低渗储层，孔隙结构极为复杂。孔隙结构是控制岩性油气藏流体分布和有效渗流能力的重要因素，对储层的测井电性特征、产能性质和产能有重要影响。利用毛管压力曲线开展储层微观孔隙结构分类评价，应用储层微观特征参数刻度岩心分析资料得到了储层品质指数并建立其储层分类标准；通过岩心刻度测井技术研制了常规测井资料储层分类标准并实现了单井逐层分类解释，为储层流体识别和建立精细储量参数模型奠定了基础。

Fuyu Reservoir of Daqing Placanticline is the sand shale reservoirs with low-porosity and low-permeability. This reservoir is characterized by low porosity and permeability with extremely complex pore structures. Since pore structure is the significant factor that controls the fluid distribution and effective seepage flow capacity of lithologic hydrocarbon reservoirs, therefore, it has significant influence on the logging electric property, deliverability property and deliverability of reservoirs. The classification and evaluation of the microscopic pore structure of reservoirs is conducted through the application of capillary pressure curves. A reservoir quantity index and the reservoir classification criteria are established by calibrating the core analysis data through the application of reservoir micro- scopic characteristic parameter. The reservoir classification criterion by conventional well logging data is developed by the core calibrating logging technology, and the classification interpretation of individual layer per well is realized. It lays the foundation for reservoir fluid identification and the establishment of fine reservoir parameter model.