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Geology _ Geophysics in Oil Exploration

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Unformatted text preview: IP expected before the lead evaluation. • Column2 (Risked): is the OOIP after Lead Evaluation (by multiplying of Opportunity of success with un risked OOIP). Reservoir quality: is column for another vision fro reservoir (by supervisor for example). Opportunity of Success: It is another table for structure or lead evaluation This evaluation depends also on Migration, Source, Sealing and Reservoir. 52 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exploration Ch8: Well Logging & Mud Logging In this chapter, we will know some concepts in well logging, logging tools & mud logging, but it’s necessary to know some definitions about the drilled well. Vertical Well: RT: is the Rotary Table MD: is the Measured Depth which is the distance between the rotary table to the end of well. KB: is the Kelly Bushing which is the distance between rotary table & the mean seal level (MSL) MDss: is the Measured depth sub sea which is the distance between mean sea level (MSL) to the end of well (MDss=MD-KB). KB MDss Deviated Well (Directional): TVD: True Vertical Depth which is the vertical distance from a point in the well to a point at the rotary table. TVDss: true Vertical Depth Sub Sea which is the vertical distance from a point in the well to the mean seal level. MD: Measured Depth (always>TVD) Ө: Angle of inclination which is angle of deviated well with respect to its vertical origin A: Azimuth which is angle of deviated well with respect to Magnetic North Pole. TVDss TVD KB NOTES: • If the well is vertical, TVD = MD • The difference between TVD & TVDss is always = KB • Most of wells are not 100% vertical (have a deviation about 1 or 2 degree at the end of well). • The best algorism calculation used in deviation survey is Minimum Curvature Algorism. • KB & GL values sometimes have negative (-ve) values if the survey area location if it below the Mean Sea Level (MSL). 53 Geology & Geophysics in Oil Exploration Mahmoud Sroor Geology & Geophysics in Oil Exp...
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