By Darwin V. Ellis
The 1st version of this booklet demystified the method of good log research for college kids, researchers and practitioners. within the 20 years for the reason that, the has replaced tremendously: technical staffs are smaller, and hydrocarbons are more durable to find, quantify, and bring. New drilling innovations have engendered new size units included into the drilling string. company restructuring and the "graying" of the staff have prompted a lack in technical competence concerned with the hunt and exploitation of petroleum. The up to date second version studies logging size know-how built within the final 20 years, and expands the petrophysical purposes of the measurements.
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Extra info for Well Logging for Earth Scientists
65 g/cm3 ? 00 g/cm3 ). 3 In the formation of a mudcake, an annulus of lower porosity mud is formed by expelling some of the water in the mud into the formation. 0 g/cm3 . What is its porosity, assuming that it was formed from the 11 lb/gal mud from the previous example? 4 The volume of water expelled from the mud, during the creation of the mudcake, will displace the formation fluid, creating the so-called invasion zone. The thickness of this zone, in which the formation fluid has been displaced by mud filtrate, will depend on the formation porosity.
Once these relationships are established, more quantitative procedures of interpretation will be described. 2 RUDIMENTARY INTERPRETATION PRINCIPLES Log interpretation, or formation evaluation, requires the synthesis of logging tool response physics, geological knowledge, and auxiliary measurements or information to extract the maximum petrophysical information concerning subsurface formations. In this section, a subset of this procedure is considered: wellsite interpretation. This subset refers to the rapid and somewhat cursory approach to scanning an available set 17 18 2 INTRODUCTION TO WELL LOG INTERPRETATION of logging measurements, and the ability to identify and draw some conclusion about zones of possible interest.
The drift velocity can be estimated from the fact that the charge carriers are accelerated in the applied electric field until they collide with another particle, at which time they are brought to rest and begin the process again. 4) m where the term F/m represents the acceleration of the charge carriers of mass m, subject to a force F. In this case the force applied, F, is equal to the product of the charge and the electric field (qE). 5) v dri f t = µ F, v dri f t = where the constant of proportionality µ is referred to as the mobility of the particle in question in a specified medium.
Well Logging for Earth Scientists by Darwin V. Ellis