By George B. Asquith, Charles R. Gibson
Uncomplicated good Log research is a common advent to universal openhole logging measurements, either twine line and MWD/LWD, and the translation of these measurements to figure out the normal analytical pursuits of porosity, fluid saturation, and lithology/mineralogy. it's prepared through the translation targets of the knowledge, instead of by way of the underlying physics of the measurements.The accompanying CD-ROM comprises electronic types of the knowledge from the case stories, a precis advisor to the measurements and their interpretation, and a straightforward spreadsheet containing the various extra universal interpretation algorithms.This moment variation of simple good Log research promises a good influence on education and self-training in addition to better workbook workouts, more moderen 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 options) in order that the options defined right here 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 neighborhood. Our books foster clinical study, increase the technology of geology and advertise the best use of petroleum extraction & processing know-how 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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Additional resources for Basic Well Log Analysis for Geologists (AAPG Methods in Exploration 3)
J i> ^ ~^ ^ - ! —. 4 1— cz -r*-" i =ttt " U Nc * i [•" li 1 " - y -4**i - J ----- 4 ~- • '-«- - - .. '••' w~ "i\ '* I ^ - I t*. 4--H • * - -" - - ;'lf 1 • - T 4 - p ^*v — v • 4 - t , f , • 3 -+- - | A • t 1 ; t Y 2000. T SEL Rm o1 meas. l i m p . 058 at 7 2 ° F temp. Mon. Rec . Temp . 268 ° at 7 2 ° , F at 7 2 ° F F BASIC RELATIONSHIPS OF WELL LOG INTERPRETATION Figure 6B. Example of Dual Laterolog* - Microspherically Focused Log (MSFL)* curves through a water-bearing zone. Given: the drilling mud is saltwater-based (Rmf — Rw).
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. 00 SP 2000. MVi " 2606". 2000 2000. pr I v . $ J |1 Cf V ^*J ~i •*, \3 || " t \ \ ^ 1 * - - *r3'fc S_^«N N. 1 I 1 i. \ ""'*.
The Induction Electric Log is normally used when R^ » Rw. Note that log scales are shown horizontally at top of log. Track #1—The log track on the far left contains the spontaneous potential (SP) log. Typically, each increment on the scale equals 20 millivolts, so that the value at the sample depth of 7,446 ft is about 40. Because the deflection is to the left (negative deflection) the log value is negative, or approximately — 40 mv. Track #2—The middle log track contains two resistivity curves.