断层封闭性演化史研究方法及应用

A method for study on evolution history of fault sealing property and its application

徐海霞 赵万优 王长生 彭涛 张文伟 李静

中国地质大学能源学院，北京 100083 大庆油田有限责任公司第七采油厂，黑龙江 大庆 163001 3．江苏石油勘探局地球物理勘探处，江苏 扬州 225009

断层封闭大致有2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，泥岩涂抹使断面压差很高而封闭。针对这些问题，利用Allan图、断裂带泥岩质量分数和断层面物质涂抹分析法，对葡西斜坡的2条断层在葡萄花油层的封闭性演化史进行研究，结果表明：不同时期断层的封堵性不同，嫩江组沉积末2条断层主要表现为封堵；现今2条断层部分开启，即成藏期断块边界断层封闭性较好，这与葡182区块油气富集程度低的勘探结果相吻合。

Fault sealing includes two types. One is lithology sealing type caused by the sand shale juxtaposition of hanging wall and
bottom wall of faults. The other is the fractured surface type, namely the mudstone plaster causes the sealing by a high differential
pressure of fractured surface. Based on this point, this paper discussed the fault sealing history on the west slope of Putaohua
Oilfield by using of Allan diagram, calculation of the shale content of the fault filling materials and analysis of the shale smear on
fault surface. The study results show that the fault sealing property is different in different periods. The two faults had poor sealing
capability at deposition tip of the Nenjiang Formation and are partly open at present. The faults of fault boundary have a good
sealing property, which is corresponding with the exploration result of low-degree hydrocarbon inrichment in Block Pu182.