There are several attributes of hydrocarbon zones that are very important to well log interpretationthe free water level fwl occurs at a capillary pressure, equal. Objectives get to know various log measurements recognize fluid type and lithology of major reservoirs, and some practical application of log data familiarize with factors affecting the log response understand the strategy in well evaluation get to know various approaches to well logging design exercise with well log design. The fundamentals of petrophysical well log interpretation are presented in this monograph, which is a compilation of slideoriented course notes and commentary created by the author over many semesters of undergraduate and graduate classroom instruction and is designed as a selfteaching guide with worksheets. Pdf interpretation of wireline log data for reservoir. Modern log analysis is more frequently carried out using computers. Open hole wireline logging self learning module uio. These independent methods can be used to calibrate log analyses. Dec 11, 20 basic well log analysis from asquith, early book that provide a good interpretation in petrophysicformation evaluation.
In this regard, the present research work was focused on wireline log data to characterize the reservoir of the rashidpur well4. A well log is a record of the well depth verses some physical parameter of the well. Gr trends is a basic logging curve used to interpret the sedimentary facies in the subsurface as major indicator of lithology. These logging these logging tools record the level of naturally occurring ga mma ray emissions from the rocks. Basic well log analysis for geologist george asquith, aapg. Basic well log analysis second editionwith sections by steven henderson and neil hurley aapg methods in exploration series 16. Introduction this course is intended for people who are interested in learning more about well logs. Well log interpretation training course petroskills wli. Schlumberger log interpretation principles applications manual, both of which are. The various openhole services offered by schlumberger are discussed in some detail, together with essential methods of interpretation and basic applications. There is a very large range of basic logs that can be run in a well, and an even greater number of derived logs, i. Log interpretation principlesapplications schlumberger. The takeaway is that for virtually every measurement and wireline tool, there is an equivalent lwd tool. Fill the gaps between wells 28 cores 1600 wells 108 million cells log datum terminology kb kelly bushing elevation.
Well log analysis for reservoir characterization aapg wiki. Roberto peveraro roberto peveraro is a petroleum geoscience and engineering consultant with over 38 years experience in the oil industry, including senior technical management positions in formation evaluation, rock. Pdf basic well log analysis second editionwith sections. We discuss petrophysical analysis of wireline logs, methods for formation evaluation and issues in evaluating tight sandstone formations. Pdf basic well log interpretation mbereobong archibong. The best logs for lithological purposes are those that are 1 most influenced by rock properties and 2 least influenced by fluid properties.
Wireline presentation gases chemical engineering scribd. Jun 29, 2012 basic evaluation of south louisiana well log. The logs used in interpretation are all measurements of nuclear properties, which are sensitive to both fluids and gases within the pore space and the mineral composition of the rock framework. Scribd is the worlds largest social reading and publishing site. The clean zone define as where the value of gr is low.
The schlumberger log interpretation chartbook was initially developed to correct raw wireline and lwd. It is important for many petroleum professionals to be able to understand well logs and what they mean. The advanced wireline tools are too large to fi t in drillpipeconveyed logging like on the jr, so measurements like nmr and pressure sampling can only be offered in lwd. The log may be based either on visual inspection of samples brought to the surface geological logs or on physical measurements made by instruments lowered into the hole geophysical logs. Notable exceptions are fluid sampling and sidewall coring. During interpretation first we have to select the clean zone. Well logging, also known as borehole logging is the practice of making a detailed record a well log of the geologic formations penetrated by a borehole. Interpretation of wireline log data for reservoir characterization of the rashidpur gas field, surma basin, bangladesh article pdf available october 20 with 671 reads how we measure reads. Open and cased hole log interpretation training seminar. Fred schroeder, retired from exxonexxonmobil presented on june 20, 2017. Alternate methods for determining water saturation include analysis of cores cut with lowinvasion oilbased muds obms and single well chemical tracer swct tests.
Consortium alumni association presents a oneday course on. Wireline and loggingwhiledrilling lwd log quality control and its impact on interpretation introduction the certification of acquired data is a very critical aspect of wireline and loggingwhiledrilling lwd logging and is performed through the observation of key quality indicators. Crystal graphical log interpretation workstation basis for. Today sensors embedded in the drill collars of mwd and lwd toolstrings provide alternatives to wireline tools. The main concerns of log interpretation in tight gas sandstones include porosity interpretation, understanding the. The simplest radioactive method in geophysical well logging is the natural gamma log. Successful completion of the course will give participants a good understanding of the basic logging measurements and interpretation methods, sufficient to assess log quality and identify data acquisition problems, and to perform their own simple log. This three hour online course discusses well logs and how to interpret them. This log contains 3 tracks and many different sets of log data. Roberto peveraro roberto peveraro is a petroleum geoscience and engineering consultant with over 38 years experience in the oil industry, including senior technical management positions in formation evaluation, rock physics and borehole geophysics. It is arranged by the interpretation goals of the data, rather than by the. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. These logging these logging tools record the level of naturally occurring ga.
Contents introduction basic well log basic concepts interpretation drilling objectives categories of wells borehole environment lecturer. To view these pdf files you need the adobe acrobat reader program complete document pdf 2. Aapg methods in exploration series, 28, 244pp incl cd schlumberger, 1989. Basic well log interpretation free download as powerpoint presentation. Basic well log analysis from asquith, early book that provide a good interpretation in petrophysicformation evaluation. Although manual interpretation of log data is still common, log evaluation has also evolved beyond calculations using archies water saturation. Basic relationships of well log interpretation aapg. Well logging department data interpretation centre. Basically, a formation with high gamma ray reading indicates that it is a shaly or shale, when the low gamma ray reading indicates a clean formation sand, carbonate, evaporite, etc. Read through the remainder of this section a find out how to process each log. Published in 1991, log interpretation principlesapplications provides a thorough background of log interpretation.
It is also an excellent tool for correlation, especially used in conjunction with the gamma ray log. Successful completion of the course will give participants a good understanding of the basic logging measurements and interpretation methods, sufficient to assess log quality and identify data acquisition problems, and to perform their own simple log interpretations in clean formations. In shale the value of gr is high and in carbonates and clean sands the value of gr is low. Getting harder as the easy targets have already been exploited. These earlier studies were motivated by the fact that gasbearing reservoir of bangladesh was taken special attention due to its economic interest. Well logging and formation evaluation toby darling 2005. The course will cover all the basics of log data acquisition and interpretation. It is arranged by the interpretation goals of the data, rather than by the underlying physics of the. Predict facies in wells without core, but with good logs 4. Basic relationships of well log interpretation introduction this chapter provides a general introduction to well logging principles and methods that will be used throughout the book. Density log neutron log neutron density log combination primary and secondary porosity. Wireline and loggingwhiledrilling lwd log quality control. Basic well log interpretation a pdh online course for. Succeeding chapters 2 through 6 introduce the reader to specific log types.
However, other log keys are given of evaporite sequences and coalbearing clastic successions. Although manual interpretation of log data is still common, log evaluation has also evolved beyond calculations using archies water saturation equation. The text discusses how different log types measure various. Formation factor porosity relationships for sandstones. Working on the log panel use a combination of lithology and permeability indicators to identify the potential reservoir intervals. Basic well log interpretation chemistry physical sciences.
Crains petrophysical handbook cement integrity logs cbl. This interactive, applicationsdriven 5day advanced well log interpretation training course will highlight the techniques and principles of advanced well log interpretation for oil industry professionals who needs to deal with wireline andor lwd logs in their daily job. Basic well log analysis is a general introduction to common openhole logging measurements, both wire line and mwdlwd, and the interpretation of those measurements to determine the traditional analytical goals of porosity, fluid saturation, and lithologymineralogy. Anyone taking this course should be somewhat familiar with oil or gas well design and terminology. Wireline presentation free download as powerpoint presentation. Induction laterolog vertical resolution and radius of. Lithological determination from wireline logs is often done by sophisticated computer programs, but basic quicklook interpretation can be made by visual inspection of appropriate logs. The middle one, which is 1 foot long emits the main current, while the 5 foot long electrodes either side of it emit a current that is designed to help keep the central current more focussed. This interactive, applicationsdriven 5day gl o macs open and cased hole log interpretation training course will highlight the techniques and principles of the main open and cased hole logging tools used in the oil industry for professionals who needs to deal with wireline logs in their daily job this gl o macs training course will explore the tools response explained from their.
Learning basic and advanced methods and techniques for log interpretation. This petroknowledge training course will explore the tools. The user will be able to interpret the lithology by using several logs, there are gamma ray, spontaneous potential, resistivity, and density log. Fundamentals of petrophysical welllog interpretation. The fundamentals of petrophysical welllog interpretation are presented in this monograph, which is a compilation of slideoriented course notes and commentary created by the author over many semesters of undergraduate and graduate classroom instruction and is designed as a selfteaching guide with worksheets. Relating log character to sedimentary facies building a reservoir model model 1. Each log from the composite panel previous page is described seperately. Log interpretation principlesapplications available through classfronter krygowski, d. Traditionally, petrophysicists were concerned only with wireline logging, that is, the data acquired by running tools on a cable from a winch. Basic logging concepts and principles of metrology.