Download PDF by George B. Asquith, Charles R. Gibson: Basic Well Log Analysis for Geologists (AAPG Methods in

By George B. Asquith, Charles R. Gibson

ISBN-10: 0891816526

ISBN-13: 9780891816522

Simple good Log research is a common creation to universal openhole logging measurements, either twine line and MWD/LWD, and the translation of these measurements to figure out the normal analytical ambitions of porosity, fluid saturation, and lithology/mineralogy. it's prepared by means of the translation pursuits of the information, instead of by way of the underlying physics of the measurements.The accompanying CD-ROM comprises electronic models of the knowledge from the case experiences, a precis advisor to the measurements and their interpretation, and a straightforward spreadsheet containing a number of the extra universal interpretation algorithms.This moment version of easy good Log research promises an excellent effect on education and self-training besides enhanced workbook routines, more recent measurements, borehole imaging, and nuclear magnetic resonance in separate chapters, all directed to supply a advisor throughout the long and infrequently ambiguous terminology of good logging and petrophysics. It offers readers with interpretation examples (and strategies) in order that the strategies defined right here may be practiced.American organization Of Petroleum Engineers (AAPG)Founded in 1917, we're the world's greatest expert geological society, with over 30,000 members.We are a pillar of the world-wide clinical group. Our books foster clinical examine, strengthen the technological know-how of geology and advertise the simplest use of petroleum extraction & processing expertise and practice.Some of the parts we put up in include:GISPetroleum EngineeringWell Log AnalysisGeological ModelingCarbonate PetrologySeismic ImagingReservoir CharacterizationRegional Petroleum research

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Extra info for Basic Well Log Analysis for Geologists (AAPG Methods in Exploration 3)

Example text

2. Follow BHT (180°) vertically up until it intersects 10,000 ft (TD) line. This intersection defines the temperature gradient. 3. Follow the temperature gradient line up to 6,000 ft (formation depth). 4. Formation temperature (140°) is read on the bottom scale vertically down from the point where the 6,000 ft line intersects the temperature gradient. NOTE: In the United States (as an example) 80° is used commonly as the mean surface temperature in the Southern States, and 60° is used commonly in the Northern States.

133 x Tf) R mfe /R we = 10-ssp/Ktt Rmfe = (146 X Rmf - 5)/(337 x Rmf + 77) R^,. 1 R\ve = Rmfe/(Rmfe/Rwe) R^ at 75°F = (77 X Rwe + 5)/(146 - 377 x Rwe) R*. e. Rmfe) stands tor equivalent resistivity. t1 SHA kg BASE LINE THE SPONTANEOUS POTENTIAL LOG kj . 5 •si -si I _ RMF»RW ALL SANDS kj ^ 91 E=| rr-rl THICK CLEAN WET SAND SSP RMF = RW SP % 3 THIN SAND RMF>RW PSP THICK SHALY WET SAND RMF:*>RW SP THICK CLEAN GAS SAND RMF

An example of the procedure is presented in Figure 19. 2 to 2000 ohm/meters (Fig. 18) and correspond to tracks #2 and #3 on the Induction Electric Log. Normally, a spontaneous potential (SP) curve is placed in track #1 (Fig. 18). RESISTIVITY LOGS The deep induction log (R]Ld) does not always record an accurate value for deep resistivity in thin, resistive (where R, > 100 ohm/meters) zones. Therefore, an alternate method to determine true resistivity (R,) should be used. The technique is called Rt minimum (R, min) and is calculated by the following formula: Rtmin = (LL-8*orSFL*)xRw/Rmf Where: Rt min = true resistivity (also called R( minimum) Rmf = resistivity of mud filtrate at formation temperature Rw = resistivity of formation water at formation temperature LL-8*= shallow resistivity Laterolog-8* SFL* = shallow resistivity Spherically Focused Log* The rule for applying R, min is to determine Rt from both the Dual Induction Focused Log tornado chart (Fig.

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Basic Well Log Analysis for Geologists (AAPG Methods in Exploration 3) by George B. Asquith, Charles R. Gibson

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