Geology _ Geophysics in Oil Exploration


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Unformatted text preview: eral .Radial .Enechlon C‐Geometrical classification based on value of dip of fault: • High angle fault: Dip>45 • Low angle fault: Dip<45 2‐Genetic classification: A‐Classification based on movement along fault: • • • • Normal fault: Reverse fault Thrust fault: dip<15 Strike slip fault: • Sinstral strike slip • Dextral strike slip Sinstral Dextral B‐Classification based on absolute movements: • Normal fault classification: The movement may have five • Foot wall didn’t move (hanging wall moved up) • Foot wall moved up (hanging wall remain stationary) • Both blocks moved up but hanging wall moved slower than foot wall • Both blocks moved down but the hanging wall moved faster than foot wall • Thrust fault classification: • Can be defined in the same way like normal fault classification • Up thrust: the uplifted block is the active element • Under thrust: the foot wall is the active element 22 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exploration Wrenching: Is strike slip fault & occur usually in basement. It affects the younger layers above it due to presence of horizontal movements at basements. Its importance because of its presence forming new structures can be good reservoirs for oil. Theoretical Wrench movement: The block affected by a strike slip fault& this causes: • Tension in length for one axis • Compression in length for the other axis Divergent & convergent Wrenching: In real, the fault is usually deviated (not straight line) & this type of fault forming two zones: • Convergent Wrench: zone in which a compression occurred& forming folds • Divergent Wrench: zone in which a tension occurred & forming faults. Sometimes Blocks may slump in this zone which called Interblock Tension Effect of Wrench on Upper layers: • left lateral(Sinstral): will form right stepping faults in Tension zone & left stepping folds & thrust faults in co...
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