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Unformatted text preview: mpression zone • Right Lateral(Dextral): will form left stepping normal faults in tension zone & right stepping folds & reverse faults in compression zone Roll over Structure: Rollover systems are extremely common structures of thin‐skinned extensional systems resulting from gravity force. Rollover anticline is fold resulting from extension force (not tension like other folds) due to gravity Rollover structure usually associated with Crestal collapse forming Grabens & half Grabens Wrench 23 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exploration Some types of faults: Antithetic & Synthetic Faults Planner Extensional fault system Rollover with Crestal collapse ttry rertty Horst & Grabens Listric fault system ‘ Horse tail Fault Flower structure fault Ramp‐Flat Relay‐Ramp 24 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exploration Faults in seismic sections: Flower structure 25 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exploration Listric fault Graben 26 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exploration CH4: Petroleum Geology Petroleum geology refers to the specific set of geological disciplines that are applied to the search for hydrocarbons. Oil and gas fields are geological features that result from the coincident occurrence of four types of geologic features (1) oil and gas source rocks, (2) Migration, (3) reservoir rocks, (4) seals, and (5) traps. 1‐Source rock: In petroleum geology, source rock refers to rocks from which hydrocarbons have been generated or are capable of being generated. They form one of the necessary elements of a working petroleum system. They are organic‐rich sediments that may have been deposited in a variety of environments including deep water marine, Lacoustrine and deltaic. Oil shale can be regarded as an organic‐rich but immature source rock from which little or no oil has been generated and expelled. Types of source rocks: are classif...
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- Spring '10