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断层封闭大致有两种类型 ,一是岩性封闭型 ,断层上、下盘砂泥岩并置造成封闭 ;二是断面型 ,即泥岩涂抹使断面压差很高而封闭。对于由并置作用引起的断层封闭性 ,可在Allan模式的基础上定量评价 ;对于因泥岩涂抹造成的断层封闭 ,可应用断面物质涂抹法 ,用泥岩涂抹系数、泥岩涂抹比率、泥岩涂抹潜力等属性参数描述其空间封闭性。在大港油田千米桥地区大张坨断层的三维封闭性定量评价中 ,用实测地层压力来标定其泥岩涂抹属性参数 ,确定大张坨断层的中、下部都是封闭的。
There are basically two types of fault sealing. One is a lithologic closed type, and the upper and lower plate sand and mudstone are confined to be closed. The other is cross-section type. That is, the application of mudstone causes the cross-section pressure to be high and close. Quantitative evaluation based on Allan mode can be quantitatively evaluated on the basis of the Allan mode for fault sealing due to the collocated effect. For the fault sealing due to mudstone smear, the cross-sectional material smear method, the mud smear ratio, the mudstone smear ratio, the mudstone smear potential, and the like can be applied Property parameters describe its spatial closure. In the three-dimensional closed quantitative evaluation of Dachangliao fault in the area of 1000 meters in Dagang Oilfield, the parameters of mudstone smear were calibrated with the measured formation pressure to confirm that the middle and lower parts of Dachanglou fault were all closed.