Well Logging and Formation Evaluation

Total Page:16

File Type:pdf, Size:1020Kb

Well Logging and Formation Evaluation Well Logging And Formation Evaluation Book Code : hentAU1CbW7ZDyT Download [BOOK] Pdf Free Well Logging And Formation Evaluation formation evaluation during mud logging. gowell international llc. wele to cnlc. surface logging services schlumberger. formation evaluation gamma ray. nfes norwegian formation evaluation sociey. pulsed neutron logging halliburton. wireline technology wireline logging equipment ge oil. blowout well drilling. cement bond logging tools schlumberger. jlog petrophysical software petrophysics software. afes wele to the aberdeen formation evaluation society. porosity evaluation with acoustic logging petrowiki 1 / 7 Formation Evaluation During Mud Logging May 9th, 2018 Formation Evaluation For This Discussion Is The Process Of Describing A Geologic Formation And Any Fluids Contained Within In Terms Of Their Constituent Properties' 'Gowell International LLC May 8th, 2018 Wireline Logging Tools Well Integrity At GOWell we are constantly evolving to meet our customer´s growing needs' 'WELE TO CNLC MAY 5TH, 2018 CHINA NATIONAL LOGGING CORPORATION CNLC IS A SPECIALIZED SERVICE PANY MAINLY ENGAGED IN' 'surface logging services schlumberger may 11th, 2018 surface logging services actionable information on well status drilling performance 2 / 7 reservoir fluid position and more timely accurate information about well status and drilling performance help drill better wells more efficiently' 'FORMATION EVALUATION GAMMA RAY MAY 7TH, 2018 THE FORMATION EVALUATION GAMMA RAY LOG IS A RECORD OF THE VARIATION WITH DEPTH OF THE NATURAL RADIOACTIVITY OF EARTH MATERIALS IN A WELLBORE MEASUREMENT OF NATURAL EMISSION OF GAMMA RAYS IN OIL AND GAS WELLS ARE USEFUL BECAUSE SHALES AND SANDSTONES TYPICALLY HAVE DIFFERENT GAMMA RAY LEVELS' 'nfes norwegian formation evaluation sociey may 6th, 2018 look ahead geosteering via real time integration of logging while drilling measurements with surface seismic 07 02 2018 gianbattista tosi eni laminated reservoirs – what can you do with pesky lwd data' 'Pulsed Neutron Logging Halliburton May 11th, 2018 Pulsed Neutron Logging Locate and manage production more effectively Pulsed neutron 3 / 7 technology is a vital tool for engineers and petrophysicists to find oil and gas reservoirs and manage them more effectively''Wireline Technology Wireline Logging Equipment GE Oil May 8th, 2018 Our Product Portfolio Built On The Heritage Of Sondex Wireline Products Includes Technology For Open Hole Formation Evaluation Well Integrity Array Production Logging Tractor Conveyance Ballistic Perforating And Pipe Recovery' 'Blowout well drilling May 10th, 2018 A blowout is the uncontrolled release of crude oil and or natural gas from an oil well or gas well after pressure control systems have failed Modern wells have blowout preventers intended to prevent such an occurrence''Cement Bond Logging Tools Schlumberger May 7th, 2018 Cement Bond Logging Tools APPLICATIONS Cement evaluation Casing inspection – Corrosion detection and monitoring – Detection of internal and external damage or' 4 / 7 'JLOG PETROPHYSICAL SOFTWARE PETROPHYSICS SOFTWARE MAY 10TH, 2018 JLOG® PETROPHYSICAL SOFTWARE PETROPHYSICS SOFTWARE FORMATION EVALUATION SOFTWARE WELL LOG ANALYSIS SOFTWARE LOG ANALYSIS SOFTWARE WELL LOG INTERPRETATION SOFTWARE VERSION 9''AFES Wele to the Aberdeen Formation Evaluation Society May 9th, 2018 Wele to the Aberdeen Formation Evaluation Society a chapter of the Society of Petrophysicists and Well Log Analysts' 'Porosity evaluation with acoustic logging PetroWiki May 11th, 2018 Acoustic logging tools can assist in evaluating porosity because the pressional velocity of sound in fluid is less than the velocity in rock' 5 / 7 ' Basic Wireless Transmitter And Receiver Kit ManualTransmission Removal Toyota CamryEbook Toeic Test Bing Just PdfCh 25 Conceptual Physics Exercises AnswersMatt Christopher Stealing HomeRenault Megane 15 Dci ManualPadi Peak Performance Buoyancy Knowledge Review AnswersThe Go Hcg Diet Weight Loss ProgramVale Middle School Article Answer KeyFire Officer Principles And Practice Second EditionPoem About Female Reproductive SystemIntroduction To Critical Discourse Analysis Bloor English 4 Final Exam ReviewIfsta Hazmat Operations Practice TestDirected A Forming New Substances Answer KeyDriver License Russian TestOut Of Africa Karen BlixenDigital System Design Ei 2353Taxes And Business Strategy SolutionSiemens Hipath 3550 User ManualWest Bengal Board Class Xii Syllabus EducationMachine Knit Beanie PatternsShobha Dey SpouseChronological Order Paragraph Sample English Class 11 Cbse Question And AnswersDepartment Of Mechanical And Industrial EngineeringJo 6 / 7 Frosts Toddler Sos Solutions For The Trying Toddler YearsNcert Solutions For Class 12 Physics SolutionPraxis 5203 Practice TestDownload Language Leader Intermediate Wordpress ComApplication For Special ExaminationSample Recommendation Letter For Nicu NursesAnswer Sheet For 1920 Scavenger Hunt SheetBasic Thermodynamics NotesMchale Fusion 1Williamson Macroeconomics 5th EditionEdexcel Math Paper 2014 4hLaboratory Investigations Ap Environmental Science Answer Key Design Of Steel Structure By DuggalTechnical Education Center Automotive Service Technology Interactive Reader And Writer Answers Grade 12T2 Returnable Documents All Tenders Eskom Verfahrenstechnik Mechanische StiessAirbus A330 General FamiliarizationIcebreaker Personality ActivitiesAlgebra 1 Test 12 AFac1502 Past Exam Solutions 2013 Oct NovChenille Baby Blanket Yarn Shumway Cook And Woollacott Motor ControlExample Istructe Technical Report Copyright Code : bRm7CPJSriuTfVZ Powered by TCPDF (www.tcpdf.org) 7 / 7.
Recommended publications
  • Common Practice of Formation Evaluation Program in Geothermal Drilling
    PROCEEDINGS, 46th Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, February 15-17, 2021 SGP-TR-218 Common Practice of Formation Evaluation Program in Geothermal Drilling Vicky R. Chandra1, Ribka F. Asokawati2, Dorman P. Purba3 1PT Geo Dipa Energi, Jl. Warung Buncit Raya No.75, Jakarta, Indonesia 2PT Rigsis Energi Indonesia, Equity Tower, 49th Floor, Jl. Jend. Sudirman, Jakarta, Indonesia 3PT Enerka Bhumi Pratama, Kawasan Komersial Cilandak Gudang 410, Jakarta Selatan 12560, Indonesia [email protected] Keywords: technique, petrography, xrd, methylene blue, formation evaluation, cutting, coring, pressure, temperature, spinner, rock pH, borehole image, drilling, mudlogging, geothermal ABSTRACT Formation evaluation program in drilling operation, particularly geothermal drilling, is very much determined by the purpose and objective of drilling itself. During early exploration phase, the formation evaluation program is carried out by collecting as much subsurface information as possible. This was applied because of available subsurface data to support the development geothermal project are very limited. On the other hand, the program is very influenced and directly involve to the drilling operation that might risks the drilling operation, in term of well stability and well cost perspective. Thus, the effective and efficient techniques are highly required in the making of proper formation evaluation program. The main purpose of formation evaluation is to get a better understanding of subsurface geology and developed geothermal system so the best future strategy of field development can be determined. By doing this evaluation while drilling, it will give an advantage to the drilling operation itself. Knowledge of the real-time drilled formation, in term of its behavior, characteristic, and composition, will help the improvement of drilling performance and increase the well success ratio.
    [Show full text]
  • Introduction to Formation Evaluation
    Introduction to Formation Evaluation By Abiodun Matthew Amao Monday, September 09, 2013 Well Logging PGE 492 1 Lecture Outline • What is formation evaluation? • Why do we evaluate formation? • What do we evaluate? • What data are we interested in? • Who needs these data? • What tools and methodology? • Summary • References Monday, September 09, 2013 Well Logging PGE 492 2 What is formation evaluation? • Formation evaluation is the application of scientific principles, engineering concepts and technological innovations in the exploration and prospecting of hydrocarbon resources in geological formations in an environmentally sustainable and responsible manner. • It involves detailed and systematic data acquisition, gathering, analysis and interpretation both qualitatively and quantitatively while applying scientific and engineering principles. • It is an ever growing and evolving field of petroleum engineering • Petrophysicists are engineers or geologists that specialize in the profession of formation evaluation. Monday, September 09, 2013 Well Logging PGE 492 3 Why do we evaluate formation? • We want answers to the following questions: • Is there any oil or gas there? • Where are they located? • How much of it? • How much can we produce, which answers the question, “How much money can we make?” Monday, September 09, 2013 Well Logging PGE 492 4 What do we evaluate? • We evaluate a reservoir; a reservoir is the “container” storing the hydrocarbon. • A conventional reservoir will be characterized by the following properties; – Trap/Cap Rock
    [Show full text]
  • Evaluation of Non-Nuclear Techniques for Well Logging: Technology Evaluation
    PNNL-19867 Prepared for the U.S. Department of Energy under Contract DE-AC05-76RL01830 Evaluation of Non-Nuclear Techniques for Well Logging: Technology Evaluation LJ Bond RV Harris KM Denslow TL Moran JW Griffin DM Sheen GE Dale T Schenkel November 2010 PNNL-19867 Evaluation of Non-Nuclear Techniques for Well Logging: Technology Evaluation LJ Bond RV Harris KM Denslow TL Moran JW Griffin DM Sheen GE Dale(a) T Schenkel(b) November 2010 Prepared for the U.S. Department of Energy under Contract DE-AC05-76RL01830 Pacific Northwest National Laboratory Richland, Washington 99352 ___________________ (a) Los Alamos National Laboratory Los Alamos, New Mexico 87545 (b) Lawrence Berkeley National Laboratory Berkeley, California 94720 Abstract Sealed, chemical isotope radiation sources have a diverse range of industrial applications. There is concern that such sources currently used in the gas/oil well logging industry (e.g., americium-beryllium [AmBe], 252Cf, 60Co, and 137Cs) can potentially be diverted and used in dirty bombs. Recent actions by the U.S. Department of Energy (DOE) have reduced the availability of these sources in the United States. Alternatives, both radiological and non-radiological methods, are actively being sought within the oil- field services community. The use of isotopic sources can potentially be further reduced, and source use reduction made more acceptable to the user community, if suitable non-nuclear or non-isotope–based well logging techniques can be developed. Data acquired with these non-nuclear techniques must be demonstrated to correlate with that acquired using isotope sources and historic records. To enable isotopic source reduction there is a need to assess technologies to determine (i) if it is technically feasible to replace isotopic sources with alternate sensing technologies and (ii) to provide independent technical data to guide DOE (and the Nuclear Regulatory Commission [NRC]) on issues relating to replacement and/or reduction of radioactive sources used in well logging.
    [Show full text]
  • Risk Assessment and Evaluation of the Conductor Pipe Setting Depth on Shallow Water Wells
    Jerome J. Schubert, Ph.D. PE. Assistant Professor 501 K Richardson Building 979-862-1195 [email protected] RISK ASSESSMENT AND EVALUATION OF THE CONDUCTOR PIPE SETTING DEPTH ON SHALLOW WATER WELLS MMS PROJECT NO. 495 Final Report Authors, Yong B. Tu, Texas A&M University Graduate Assistant Research Jerome J. Schubert, Ph.D. PE, Texas A&M University Assistant Professor Sulistyo Protomo, Texas A&M University Graduate Assistant Amirsaman Paknejad, Texas A&M University Graduate Assistant 3116 TAMU, College Station, Texas 77843-3116 (979) 845-2241 / FAX (979) 845-1307 / http://pumpjack.tamu.edu Risk assessment and evaluation of the conductor pipe setting depth on shallow water wells Yong B. Tu, and Jerome J. Schubert, Texas A&M University Executive Summary Introduction Faced with geopolitical and global economic uncertainties, many leading O&G corporations have placed deliberate emphasis on marketing their “shallow water” and “economically volatile” assets to small independent O&G companies. However, due to recent technological advancements in production systems, it is economically feasible for small independent O&G companies to pursue these “unwanted” assets as part of own portfolio. It is anticipated that these operators will introduce new wells into these mature fields to perform further well testing and new developments to the acquired assets. Early drilling studies and guidelines have mentioned casing design and well control issues. However, they have neglected situations where upward fluid migration can lead to abnormally pressured shallow formations, especially in a developed field. Even in situations where there has not been any artificial charging of shallow formations, selection of conductor and surface casing setting depths has, in the past, been based more on tradition than sound engineering practices.
    [Show full text]
  • Appendix C: Well Drilling Procedure
    Table L1. Proposed CO2 Injection Well – Casing Specifications Tensile Depth Size Weight Collapse/ TUBULAR Grade Thread Body/Joint (ft) (in) (lb./ft) Burst (psi) (X 1000 lbs.) Conductor 0 - 40 13-3/8 48 H-40 ST&C 770/1,730 541/322 Surface Casing 0 – 965 9-5/8 36 J-55 ST&C 2,020/3,520 564/394 Protection Casing 0 – 4,000 5-1/2 15.5 J-55 LT&C 4,040/4,810 248/217 Well Drilling Program The following sections contain the proposed step-by-step program for drilling and completing the proposed CO2 Injection Well. The CO2 Injection Well will be used for baseline monitoring and characterization, injection of the CO2 fluid during the active experiment, and post-injection monitoring of the intervals of interest. DRILLING PROCEDURE CONDUCTOR HOLE 1. Prepare surface pad location and install well cellar. 2. Mobilize drilling rig. Perform safety audit during rig-up to ensure that equipment setup complies with project requirements. 3. Notify Arizona Oil and Gas Conservation Commission at least 48 hours prior to spudding the well. 4. Drill mouse and rat holes. 5. Drill 17-1/2” conductor hole to +/-40 feet. Install 13-3/8” casing and grout annular space from set depth to surface with concrete. 6. Wait on concrete to cure for 12 hours. SURFACE HOLE 7. Rig up mud logging unit and test equipment. Collect and save 10-foot samples from 40 feet to total depth. A set of samples is required to be submitted to the Oil and Gas Administrator, Arizona Geological Survey, within 30 days of completion of the well.
    [Show full text]
  • Formation Evaluation with Pre-Digital Well Logs Formation Evaluation with Pre-Digital Well Logs
    Formation Evaluation with Pre-Digital Well Logs Formation Evaluation with Pre-Digital Well Logs RICHARD M. BATEMAN Elsevier Radarweg 29, PO Box 211, 1000 AE Amsterdam, Netherlands The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, United Kingdom 50 Hampshire Street, 5th Floor, Cambridge, MA 02139, United States Copyright © 2020 Richard M. Bateman. Published by Elsevier Inc. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Details on how to seek permission, further information about the Publisher’s permissions policies and our arrangements with organizations such as the Copyright Clearance Center and the Copyright Licensing Agency, can be found at our website: www.elsevier.com/permissions. This book and the individual contributions contained in it are protected under copyright by the Publisher (other than as may be noted herein). Notices Knowledge and best practice in this field are constantly changing. As new research and experience broaden our understanding, changes in research methods, professional practices, or medical treatment may become necessary. Practitioners and researchers must always rely on their own experience and knowledge in evaluating and using any information, methods, compounds, or experiments described herein. In using such information or methods they should be mindful of their own safety and the safety of others, including parties for whom they have a professional responsibility. To the fullest extent of the law, neither the Publisher nor the authors, contributors, or editors, assume any liability for any injury and/or damage to persons or property as a matter of products liability, negligence or otherwise, or from any use or operation of any methods, products, instructions, or ideas contained in the material herein.
    [Show full text]
  • Oilfield Review
    The Expanding Role of Mud Logging Peter Ablard For decades, samples and measurements obtained at the surface have provided mud Chris Bell Chevron North Sea Limited loggers with insights into conditions at the bit face. Information captured through Aberdeen, Scotland mud logging gave operators early indications of reservoir potential and even warned David Cook of impending formation pressure problems. New sampling and analysis techniques, Ivan Fornasier Jean-Pierre Poyet along with advances in surface sensor design and monitoring, are bringing the Sachin Sharma science of mud logging into the 21st century. Roissy-en-France, France Kevin Fielding Laura Lawton Hess Services UK Limited The mud logging unit has long been a common against deployment of wireline logging tools. In London, England wellsite fixture. First introduced commercially in such wells, analysis of mud gas and cuttings often 1939, these mobile laboratories carried little provided the first, and perhaps only, indication George Haines more than a coffee pot, a microscope for examin- that a formation might be productive. Today, Houston, Texas, USA ing formation cuttings and a hotwire sensor for although LWD technology is able to give the first detecting the amount of hydrocarbon gas encoun- glimpses of near-bit conditions in real time, Mark A. Herkommer tered while drilling. The mud logger’s job was to adverse wellbore conditions sometimes preclude Conroe, Texas record the depth and describe the lithology of the use of downhole logging tools. In such cases, formations that the drill bit encountered, then the mud log continues to inform operators of the Kevin McCarthy determine whether those formations contained producibility of their wells.
    [Show full text]
  • Well Logging and Formation Evaluation Teaching Scheme Examination Scheme LTPC Hrs/Week Theory Practical Total Mark
    17BPE301 - Well Logging and Formation Evaluation Teaching Scheme Examination Scheme Theory Practical Total L T P C Hrs/Week MS ES IA LW LE/Viva Marks 3 1 0 4 4 25 50 25 -- -- 100 Unit I Hours: 12 Introduction to Formation Evaluation, Mud Logging and Coring Introduction to petroleum formation evaluation: Basic concepts, direct Methods: Mud logging, Hydrocarbon staining on the cuttings, Lithology and texture of cutting samples, Evaluation of geopressurized zone by mud logging, Coring techniques and analysis; Indirect Methods: LWD/MWD & Wireline Logging, Instruments/Tools details, Processes of recording and representation (Log charts with tracks). Correlation of core and logging data. Unit II Hours:12 Open Hole Logging Tool physics, measurement principles and data interpretation of the following including quantitative and qualitative analysis techniques: Caliper log; Electrical logs – SP and Resistivity logs (conventional, induction and micro devices), Radioactive Logs – Gamma Ray (natural and spectral), Neutron, Density and Elemental capture spectroscopy logs; Sonic Logs including Dipole shear sonic, Nuclear magnetic resonance (NMR). Unit III Hours : 08 Data Integration and Formation Evaluation Quantitative Analysis methods for lithology, shale volume, saturation from various logs Unit IV Hours : 07 Cased Hole Logging and Production Logging CBL /VDL logs, Advance Logging tools including Casing Inspection tools, Formation micro imaging tool, , Proppant Tracer Log, Ultra sonic imaging tool; Production Logging: Introduction, type of tools, principles, limitations & applications Total Hours : 39 Texts and References: 1. Malcom Rider, Second Edition, 2002: The Geological Interpretation of well logs, Rider- French Consulting limited 2. Oeberto Serra & Lorenzo Serra, 2004 : Well logging - data acquisition and applications, Edition Serralog, France 3.
    [Show full text]
  • Gamma Ray-Density Logging
    SOCIETY OF PETROLEUM ENGINEERS OF AIME PAPER Fidelity Union Bldg. NUMBER 1253-G Dallas, Tex. THIS IS A PREPRINT --- SUBJECT TO CORRECTION Gamma Ray-Density Logging By Downloaded from http://onepetro.org/SPEPBOGR/proceedings-pdf/59PBOR/All-59PBOR/SPE-1253-G/2087146/spe-1253-g.pdf by guest on 27 September 2021 Albin J. Zak and Joe Ed Smith, Junior Members AIME Core Laboratories Inc., Dallas, Tex. ABSTRACT In the practical logging tool, a beam of gamma rays is emitted into the formation. A This paper presents a review of current small fraction of these photons find their way methods of interpreting and applying gamma ray­ back to the detector. Normally, the detector density logs in evaluating fundamental reservoir used is a Geiger-Muller counter or scintillation data. The basic theories and physical principles counter. Studies of other detecting devices, underlying the techniques of density logging with such as cloud chambers and ionization chambers, gamma rays are discussed along with some of the have shown them to be unsuitable for this purpose. problems associated with the instrumentation of The most common gamma ~ay source for this tool is such a tool. An effort has been made to evaluate radioactive cobalt (CobO ). The source is Shielded the instrument calibration techniques, and discus­ from the detector with lead such that the majority sion and figures are presented which describe the of the gamma rays counted by the detector are effect of borehole conditions, pressure, tempera­ those back-scattered from the formation. ture, etc. The relationship of natural density, grain density, and interstitial fluid density to Initial calibration of the instrument is made porosity is presented.
    [Show full text]
  • Fundamentals of Petroleum Engineering FORMATION EVALUATION
    Fundamentals Of Petroleum Engineering FORMATION EVALUATION Mohd Fauzi Hamid Wan Rosli Wan Sulaiman Department of Petroleum Engineering Faculty of Petroleum & Renewable Engineering Universiti Technologi Malaysia 1 COURSE CONTENTS . Mud Logging . Coring . Open-hole Logging . Logging While Drilling . Formation Testing . Cased Hole Logging Formation Evaluation . What is Formation Evaluation? . Formation Evaluation (FE) is the process of interpreting a combination of measurements taken inside a wellbore to detect and quantify oil and gas reserves in the rock adjacent to the well. FE data can be gathered with wireline logging instruments or logging-while-drilling tools . Study of the physical properties of rocks and the fluids contained within them. Data are organized and interpreted by depth and represented on a graph called a log (a record of information about the formations through which a well has been drilled). Formation Evaluation . Why Formation Evaluation? . To evaluate hydrocarbons reservoirs and predict oil recovery. To provide the reservoir engineers with the formation’s geological and physical parameters necessary for the construction of a fluid-flow model of the reservoir. Measurement of in situ formation fluid pressure and acquisition of formation fluid samples. In petroleum exploration and development, formation evaluation is used to determine the ability of a borehole to produce petroleum. Mud Logging . Mud logging (or Wellsite Geology) is a well logging process in which drilling mud and drill bit cuttings from the formation are evaluated during drilling and their properties recorded on a strip chart as a visual analytical tool and stratigraphic cross sectional representation of the well. Provide continuous record of penetration rate, lithology and hydrocarbon shows.
    [Show full text]
  • Nature of Solid Organic Matters in Shale
    NATURE OF SOLID ORGANIC MATTERS IN SHALE Xinyang Wu This thesis is submitted in partial fulfillment of the requirements of the Research Honor Program in the Department of Petroleum Engineering and Geology Marietta College Marietta, OH Apr. 20th 2012 This research honor thesis has been approved for the Department of Petroleum Engineering and Geology and the Honors and Investigative Studies Committee by ____________________________________ __________ Dr. Ben Ebenhack: Faculty thesis advisor Date ____________________________________ __________ Dr. Matthew Young: Thesis committee member Date Acknowledgement I would like to express my gratitude to Prof. Ben Ebenhack, my thesis advisor, for all his instructions and guidance on my research project. Without his assistance on choosing proper methods to analysis and finding related real-world resources of log records, I won’t be able to finish this impressing project. Also, I would like to thank Dr. Matt Young for being a reader outside my academic field and gives suggestions to build this paper accessible to more people. Additionally, I am grateful to all Petroleum Engineering and Geology Department especially Prof. Wendy Bartlett for the geology information she provided. Finally, I would like to offer my appreciation to all my friends and families who cheered me up whenever I got stuck in bottlenecks. Abstract Petroleum industry is always one of the major concerns in everyone’s daily life. In recent years, people paid even more attention to the field because human beings are faced with the severe problem of short in oil, or energy resource in general. This paper discusses how to characterize solid organic matters in gas-producing shale plays and how its presence affects well log measurement.
    [Show full text]
  • Petrophysical Well Log Analysis for Hydrocarbon Exploration in Parts of Assam Arakan Basin, India
    10th Biennial International Conference & Exposition P 153 Petrophysical Well Log Analysis for Hydrocarbon exploration in parts of Assam Arakan Basin, India Ishwar, N.B.1 and Bhardwaj, A.2* Summary Well logging is a study of acquiring information on physical properties of rocks that are exposed during drilling of an oil well. The key purpose of well logging is to obtain petrophysical properties of reservoirs such as Porosity, Permeability, hydrocarbon saturation etc., for hydrocarbon exploration. Logs also tell us about the fluids in the pores of the reservoir rocks. Petrophysical parameters such as effective porosity (Φ), water saturation (Sw), formation water resistivity (Rw), hydrocarbon saturation (So) and true resistivity (Rt) are evaluated by using the well log data. In the present study, an attempt has been conducted to describe the application of various open-hole logging tools such as gamma ray, neutron density, resistivity and caliper logging tools to determine the petrophysical properties of reservoirs. The present study portrays the interpretation of well log data using the openhole logs in parts of Assam Arakan Basin. Well log analysis revealed that the range of formation water resistivity (Rw) vary from 0.32 Ω-m in the deeper subsurface to 0.89 Ω-m in the shallow surface indicating the presence of fresh water bearing sands at shallow depth. An interesting zone is identified on logs at the depth of 2214.0 m with GR value of 85api, resistivity of 18 Ω-m and average porosity of 27.14% as calculated which corresponds to be hydrocarbon bearing. Oil Water Contact is encountered at the depth of 2250.0 m with Rw of 0.59Ω-m.
    [Show full text]