摘要
断层垂向封闭性受多种地质因素的制约，如断层性质、断层面产状、断层面上所受上覆地层的静压力以及断裂带充填物的性质、胶结程度、成岩程度、孔渗性等。利用声波时差资料研究断层的封闭性主要是根据断裂带充填物的性质和受压实情况：如果断裂带地层岩性致密、孔渗性差，而且又处于正常压实，则声波时差偏低，此种情况，断层对油气是开启的；如果断裂带充填物是以欠压实泥岩为主，则声波时差高，此种情况，断层对油气是封闭的；但必须是欠压实泥岩，否则，断裂带岩石疏松、孔渗性好，也可造成声波时差偏高，这种情况，断层对油气也是开启的。
The vertical sealing ability of a fault can be restricted by many geologic factors: fault category, fault occurrence, static pressure due to the overburden abovefault plane, and the type, cementation degree, porosity, permeability etc. of fillingmaterials in the fault belt. Fault sealing research using acoustilog data is mainlybased on both the filling materials in fault belt and their compaction. If the fillingmaterials are in normal compaction and then become so compact that they have poorporosity and permeability,the acoustic transit time is low and the fault is open tohydrocarbon. If the filling materials are mainly some poorly compacted mudstones,the acoustic transit time is high and the fault closes hydrocarbon. Filling materialsmust be poorly compacted mudstones,otherwise they are loose to have good porosity and permeability, thus causing high acoustic transit time and also making thefault open to hydr0carbon.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1997年第5期724-730,共7页
Oil Geophysical Prospecting
关键词
声波时差
断层垂向封闭性
断裂带
油气勘探
acoustic transit time, vertical sealing of fault, fault belt, filling materials, poor compaction
