By George B. Asquith, Charles R. Gibson
Easy good Log research is a normal 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 really is prepared by means of the translation targets of the knowledge, instead of via the underlying physics of the measurements.The accompanying CD-ROM comprises electronic types of the information from the case reviews, a precis consultant to the measurements and their interpretation, and an easy spreadsheet containing many of the extra universal interpretation algorithms.This moment variation of simple good Log research offers an excellent impression on education and self-training in addition to improved workbook workouts, more recent measurements, borehole imaging, and nuclear magnetic resonance in separate chapters, all directed to supply a consultant during the long and occasionally ambiguous terminology of good logging and petrophysics. It offers readers with interpretation examples (and strategies) in order that the recommendations defined the following could be practiced.American organization Of Petroleum Engineers (AAPG)Founded in 1917, we're the world's biggest specialist geological society, with over 30,000 members.We are a pillar of the world-wide medical group. Our books foster clinical examine, boost the technological know-how of geology and advertise the best use of petroleum extraction & processing know-how and practice.Some of the parts we submit in include:GISPetroleum EngineeringWell Log AnalysisGeological ModelingCarbonate PetrologySeismic ImagingReservoir CharacterizationRegional Petroleum research
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Additional info for Basic Well Log Analysis for Geologists (AAPG Methods in Exploration 3)
The deflection is negative, so the value (-40mv) is negative. 2. Bed thickness equals 8 ft (7,442 to 7,450 ft). 3. Resistivity short normal (Ri) equals 28 ohm-meters. 4. Formation depth equals 7,446 ft. Procedure: 1. Determine 7}—Use Figure 8 to determine the temperature of the formation (Tf). Use BHT = 135°F, TD = 8,007 ft, surface temperature = 60°F, and formation depth = 7,446 ft. (Your answer should be 130°F). 2. Correct Rm and Rmfto 7)—Use Figure 9 to correct the values for the resistivity of mud and of mud filtrate, using Tf (130°F) from step 1.
We've seen that where freshwater drilling muds invade a hydrocarbon-bearing formation (S w « 60%), there is high resistivity in the flushed zone (R x0 ), high resistivity in the invaded zone (R;), and high resistivity in the uninvaded zone (R t ). But, normally, beyond the flushed zone some diminishment of resistivity takes place. See Figure 5 for review. Ignore the left side of the log on the opposite page, and compare the three curves on the right side of the log (tracks # 2 and #3). Resistivity values are higher as distance increases from the left side of the log.
Log Curve LLS—Shallow Laterolog* resistivity curves measure the resistivity in the invaded zone (Rj). In a water-bearing zone the shallow Laterolog* (LLS) will record a low resistivity because Rmf is approximately equal toRw. Log Curve SFL—Microspherically Focused Log* resistivity curves measure the resistivity of the flushed zone (Rxo). In water-bearing zones the curve will record low resistivity because saltwater mud filtrate has low resistivity. The resistivity recorded by the Microspherically Focused Log* will be low and approximately equal to the resistivities of the invaded and uninvaded zones.