Homework_Assignment_7_Solution

Homework_Assignment_7_Solution - Homework Assignment No. 7...

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Homework Assignment No. 7 April 6, 2010 Due on April 15, 2010 @ 2:00 PM PGE368 Spring Semester 2010 Fundamentals of Well Logging Instructor: Carlos T. Verdín, Ph.D. ELECTRICAL PETROPHYSICS and INTERPRETATION OF RESISTIVITY LOGS DESCRIPTION: The objectives of this homework are: (a) To exercise the conceptual understanding of electrical resistivity logs, (b) To calculate the electrical resistivity of connate water from resistivity logs, and (c) To calculate hydrocarbon saturation from resistivity logs. GUIDELINES FOR THE PREPARATION OF HOMEWORK REPORTS: (A) YOUR REPORT SHOULD BE CLEAN, NEAT, AND WELL ORGANIZED. DESCRIPTIONS SHOULD BE LEGIBLE AND READABLE. (B) ALL FIGURES AND TABLES SHOULD BE LABELED AND PROPERLY ANNOTATED WITH A CAPTION. PLOTS SHOULD BE DISPLAYED WITH THEIR AXES, VARIABLES, AND MEASUREMENT UNITS. (C) ALL RELEVANT RESULTS AND QUANTITIES SHOULD BE WRITTEN WITH THE CORRESPONDING MEASUREMENT UNITS. (D) ATTENTION SHOULD BE PAID TO NUMBER OF DECIMAL FIGURES USED TO DISPLAY RESULTS. (E) SPREADSHEETS ARE NOT SELF-EXPLANATORY NOR ARE LOOSE FIGURES. (F) CLEARLY INDICATE THE NUMBER OF THE PROBLEM THAT YOU ARE ANSWERING EACH TIME. (G) CIRCLE YOUR NUMERICAL ANSWERS. (H) ANSWER QUESTIONS IN ORDER (IF THE ANSWERS ARE ON LOGS, KEEP THE ORDER AND GIVE THE REFERENCE TO THE PAGE NUMBER WITH THE PLOT), (I) IF YOU DID NOT HAVE TIME TO FINISH THE HOMEWORK, YOU SHOULD CLEARLY INDICATE WHICH QUESTIONS YOU DID NOT ANSWER. POINTS WILL BE DEDUCTED FROM HOMEWORK THAT DOES NOT ADHERE TO THE ABOVE PRESENTATION RULES.
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Each of the following questions is worth 4 points: 1. Archie’s equation is reliable when applied to deep resistivity measurements acquired in highly-laminated sand-shale sequences (laminations thinner than the vertical resolution of resistivity measurements) as long as individual sand layers are clay free, TRUE OR FALSE? _______ FALSE ______________ 2. Suppose that Sxo is lower than Sw in a clean sand unit that is hydrocarbon saturated and invaded with oil-base mud. What petrophysical information about the rock can you infer because of this difference? VERY SHORT ANSWER PLEASE! MOVABLE (FREE) WATER SATURATION, MOBILITY, PERMEABILITY 3. Consider the set of logs shown below. You are dealing with a siliciclastic sedimentary sequence. Sand porosity is constant. What is the saturating fluid at the location indicated with the letter A? ± hydrocarbon ± mud filtrate ± salty water ; fresh water Based on SP and resistivity it is most probable that saturating fluid is fresh water, but it is also possible to have HC and fresh water as saturating fluid. Sections A and B are both sands with the same porosity and same deep resistivity. Based on SP and resistivity, section B is saturated with HC, but if section A was saturated with HC, resistivity would be much larger than the one in section B.
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B
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The following question is worth 27 points: 4. Consider the set of logs shown below. Assume that Archie’s parameters are as follows: a =1.1, m =1.9, and n =2.1. Answer the following questions and show your work to receive credit: (a) Volumetric concentration of shale at 1,600 ft MD is _20_ %
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This note was uploaded on 02/13/2012 for the course PGE 368 taught by Professor Staff during the Spring '08 term at University of Texas.

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Homework_Assignment_7_Solution - Homework Assignment No. 7...

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