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确定油层物性下限(CUT OFF)值是储集层评价和储量评估的基础。砂岩和碳酸盐岩油层物性下限研究比较多,也比较成熟。对于砂砾岩储层,由于埋藏深度较深,孔隙结构多为双模态或复模态结构,砂砾岩油层物性下限研究比较难。通过常规物性下限研究方法结合核磁共振测井方法,确定了砂砾岩储层物性下限(CUT OFF)值为孔隙度大于等于6%,渗透率大于等于85×10-3um2。
The lower CUT OFF value is the basis for reservoir evaluation and reserve evaluation. The lower limit of physical properties of sandstone and carbonate reservoirs is relatively mature and relatively mature. For sandstone and conglomerate reservoirs, because of the deep burial depth, the pore structure is mostly bimodal or complex mode, and the lower limit of physical properties of glutenite reservoirs is more difficult to study. According to the lower limit of conventional physical property and NMR logging method, the lower limit value of CUT OFF of the glutenite reservoir is 6% porosity and 85 × 10-3um2 porosity.