Geology _ Geophysics in Oil Exploration

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Unformatted text preview: ic section in section view. Then, we determine the formation tops under each well to mark the horizon location. In 2-D interpretation case, we use the Key line as a refrence line. The Key Line is a seismic line passes through which contain many wells data as much as possible. Arbitrary Line flattened 47 Geology & Geophysics in Oil Exploration Mahmoud Sroor Time Structure with Arbitrary Line in Yellow Geology & Geophysics in Oil Exploration Structure: It is finding & marking structures at the horizon (Faults for example). We pick the fault on seismic section & find it at the other seismic lines. The fault in seismic section is called Fault Segment. The fault on map view is called Fault Polygon. Picking We start marking of interseted horizon under each well in the arbitary line. Then, complete picking the horizon in the seismic line b-Loop loop is tie between Inline & Crossline. The main idea of loop, is to correlate between two line have the same shot point (one of them is accurate data) to detect the interested horizon accuratly at the unknown one. we start to pick the horizon at the crossline. Then we repeat this process to complete the loop, & run the process to pick the horizon at all lines. Mis-Tie: The same event doesn`t have the same absolute values. A situation in interpretation of seismic data in which predicted and actual values differ, or when an interpreted reflection does not close, or tie, when interpreting intersecting lines. Static Shift: when the difference is constant at all horizons & fixed easily by Mis-Tie analysis Correction. Dynamic Shift: the difference is not constant & fixed by specific softwares & sometimes, we just adjust the intersted horizon & don’t care about the other horizons. NOTES: • • • • If there is no wells, we choose the section which has most clearly structures & keep it as a refrence line The direction of faults in arbitary line depend on level of formation tops at each well The dip angle of faults depend on th bottom of horizon. The seismic line must be prepindicular to f...
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This note was uploaded on 01/05/2011 for the course GEOL 1 taught by Professor Jenniferalford during the Spring '10 term at Indian Institute of Technology, Roorkee.

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