Aapg methods in exploration series, 28, 244pp incl cd schlumberger, 1989. Crystal graphical log interpretation workstation basis for. Typical downhole drilling operation 3d animation downhole drilling animation. Logs of standard resistivity, deep resistivity, spontaneous potential, gammaray, density and neutron logs were analyzed for the three wells. Spinner flowmeter spinnerflowmeter measures vertical fluid velocity in a pumping or nonpumping well. Developments in petroleum science, 15a welllog interpretation. 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. Preeg2 abstract neutron and density logs are important borehole measurements for estimating reservoir capacity and inferring saturating fluids. Archie 1942 provided a path from qualitative log interpretation to quantitative log analysis through an equation that required parameters which were. For this process well logs are primarily used to establish the grain size and the lithology of the penetrated sediment. These data are also used by the reservoir engineer, production technologist, and petrophysicist in determining the fluids present in the formation. Geophysical logs, when corrected for borehole environmental effects, measure in situ properties. Scribd is the worlds largest social reading and publishing site.
Well logging and formation evaluation oil and gas news. Basic well log analysis second editionwith sections by steven henderson and neil hurley aapg methods in exploration series 16. As important as this log derived information is, however, it should not be applied without the inclusion. Contents introduction basic well log basic concepts interpretation drilling objectives categories of wells borehole environment lecturer. Caliper and naturalgamma logs of well bk2202, bridgetown township, northern bucks county.
Published in 1991, log interpretation principlesapplications provides a thorough background of log interpretation. The resistivity logs are in the middle and the porosity logs are on the right. We will meet once a week and focus on the fundamentals of well logging methods, including electrical, nuclear, and acoustic measurements. The user will be able to interpret the lithology by using several logs, there are gamma ray, spontaneous potential, resistivity, and density log. The gamma ray logs of the four wells were first placed at an equal depth in order to facilitate correlation. Log log plot or derivative plot in well test analysis. Log interpretation principlesapplications schlumberger. Neutronneutron logs react mainly to the watercontent i. Gamma log records the naturalgamma radiation emitted from rocks penetrated by the borehole. But the masefield shale can be easily distinguished from the above formations on the sonic and resistivity logs, which. Stewart abstract this paper presents the results of a wireline log study on the cantuar formation of the. Ppt well log interpretation powerpoint presentation free. The quicklook log interpretation helps one to suggest points for the formation pressure tool. Introduction integrated analysis o why and how data features o data sources o data scales o volume support o data accuracy and precision o data complexity o static vs.
Petrophysical analysis of geophysical logs of the national. The study focused on quantitative analysis of petrophysical parameters to characterize the reservoir of narsingdi gas field, bangladesh using well log data. Sample descriptions and geophysical logs for cored well bp. Log interpretation principlesapplications available through classfronter krygowski, d. Generally, the permeable zone logs are presented in track one, the resistivity logs are run intrack two and porosity logs on track three. Facies interpretation is based on grain size analysis using gr logs as shown in fig. Convolution sonic log correlate seismic data in time to well data in depth density log tool. Petrophysical well log analysis for hydrocarbon exploration in parts of assam arakan basin, india ishwar, n. Objectives to give an insight in the basic well logging methods used to derive petrophysical properties for hydrocarbon exploration. Geophysical characterization and borehole geophysical.
Today we coming again, the further increase that this site has. These estimated quantities are used to evaluate a zone and to determine whether a well completion attempt is warranted. These independent methods can be used to calibrate log analyses. Petrography and petrophysical well log interpretation for.
The probes take continuous or discrete measurements indicating specific lithology and hydrologic properties. Applications of these logs are well developed in the petroleum industry. The geological interpretation of well logs available for download and read online in other formats. Fundamentals of petrophysical welllog interpretation. Exceptions are the gammaray log, which is likely affected by naturally occurring radiation from abundant volcanic detritus, and one interval within the deepest lithologic package, which appears to be abnormally electrically conductive. The spontaneous and gammaray logs are displayed on the left side of the log. My first mentor, ko ko kyi, first taught me how to read and interpret well logs just by looking at the well log patterns. Logging data are used to identify productive zones, to determine depth and thickness of zones, to distinguish between oil, gas, or water in a reservoir, and to. Well log analysis for reservoir characterization aapg wiki. Integrating core, well log and well test data page 2 of 6 kimbrell, abbaszadeh ips, inc. How to easily read a well log in 5 minutes or less using. Interpretation of porosity and fluid constituents from.
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. Geological interpretation of well logs paperback january 1, 2011 by m. Use of well logs for sequence stratigraphic interpretation of the subsurface. Sample descriptions and geophysical logs for cored well bp3. Matthew nton1 1 department of geology, university of ibadan, ibadan, nigeria summary this paper presents the interpretation of data from well logs and core samples obtained from smeks field, offshore western niger delta. The text discusses how different log types measure various. It gives a sneak peek of variant well logging methods that are used to derive some petrochemical properties of hydrocarbons. This is a compilation that will produce an effect you even. Sedimentary facies interpretation of gamma ray gr log as. The gamma log often is used to define lithology and correlate geologic units between boreholes. Such rock units are often used as stratigraphic markers in the correlation between wells. Petrophysical analysis of well logs from manitou lake. However, applications of the logs in the groundwater environment, especially the fresh groundwater environment, are much less developed for many reasons, including cost, hole. This three hour online course discusses well logs and how to interpret them.
Using such a set of logs, a log interpreter has to solve the following problems,i. The last well log contains three porous and permeable zones, located from. Well log study and stratigraphic correlation of the. Introduction this course is intended for people who are interested in learning more about well logs. Introduction this paper shows the results from the interpretation of three sets of logs from the manitou lake area in west central saskatchewan figure 1. 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. Well log interpretation indicates that coals may reach thicknesses of 3. It is important for many petroleum professionals to be able to understand well logs and what they mean. The following pages are focused on the use of well logs to build sequences stratigraphic models of depositional systems.
The depths analyzed are between 300 and 350 meters, in measured depth. Well logging department data interpretation centre. A well log is a record of the well depth verses some physical parameter of the well. Petrography and petrophysical well log interpretation for evaluation of sandstone reservoir quality in the skalle well. Well log interpretation is a process which provides complete details about the background of well logs.
Determining the porosity and true resistivity of a zone is the first step in converting the raw log data into estimated quantities of oil, gas, and water in a formation. The various openhole services offered by schlumberger are discussed in some detail, together with essential methods of interpretation and basic applications. During the early days of commercial well logging, logs were primarily used qualitatively for making formation correlations. Jun 29, 2012 loglog plot or derivative plot in well test analysis. Applied to smeks field, offshore western niger delta olumuyiwa odundun1. Anyone taking this course should be somewhat familiar with oil or gas well design and terminology.
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. Basic well log interpretation free download as powerpoint presentation. The simplest radioactive method in geophysical well logging is the natural gamma log. To unadulterated your curiosity, we have the funds for the favorite basic well log analysis 2nd edition baby book as the different today. Geophysical well logging is a mature technology comprising many separate systems. Pacific surveys is a company that does geophysical logging, downhole video surveys, swaging, borehole logging. Sonic log example slow fast which unit is the best reservoir low shale and high porosity. Petrophysical well logs are incrementaldepth records of rock, mineral, fluid, and other properties of the subsurface. Pdf the geological interpretation of well logs download. An exemple of how to make a quick interpretation of well logs using python, matplotlib, pandas and a few predefined petrophysical functions. Well logs and the practice of well log interpretation by geologists and petroleum engineers represent a critical component of the exploration and assessment of potential hydrocarbon producing formations and reservoirs.
Petrophysical well log analysis for hydrocarbon exploration. Please take into account all geophysical and borehole logs in partnership with general knowledge of the. Its just a common sense, stepbystep approach in interpreting any well logs. Pdf petrophysical analysis of well logs for reservoir. An interdisciplinary seminar for all earth scientists and engineers giving practical understanding of the principles and interpretation of geophysical well logs in research applications. It is well beyond scope of a short article like this to detail the science and the results of the many facets of. Basic well log interpretation a pdh online course for.
The value of the measurement is plotted continuously. For example, select the wells c6, c7, c1, c2, c3 and a10. Basic relationships of well log interpretation aapg. This report presents lithologic descriptions from the well samples and core, along with a compilation and basic data processing of the geophysical logs. Well log interpretation training course petroskills wli. Most of the geophysical logs have good correspondence to the lithologic variations in the well. Geophysical logs are logs created by raising or lowering a set of probes andor sondes in a well. Well log interpretation 1 well log interpretation earth environmental science university of texas at arlington 2 interpretation the primary goal of well log interpretation is to determine whether there is petroleum, and if so, how much can be recovered and how fast it will flow.
Interpretation well log free download as powerpoint presentation. Pdf fundamentals of well log interpretation oserra. Alternate methods for determining water saturation include analysis of cores cut with lowinvasion oilbased muds obms and single well chemical tracer swct tests. The log analysis is intended to support reservoir evaluation. Interpretation of welllogs and well log correlation were achieved using schlumbergers petrel 2010 version software. It is required to run the pressuresampling tool to acquire pretests and possibly downhole samples. The united arab emirates are located on the arabian peninsula fig. Well log study and stratigraphic correlation of the cantuar. Fred schroeder, retired from exxonexxonmobil presented on june 20, 2017. It important as it familiarizes the drilling team with the applications of well logs. Read pdf basic well log analysis 2nd edition basic well log analysis 2nd edition. Tgs collects and digitizes well log data from the most popular hydrocarbon plays around the globe.
Download pdf the geological interpretation of well logs book full free. These logging these logging tools record the level of naturally occurring ga mma ray emissions from the rocks. Stratigraphic correlation using well logs crewes research report volume 16 2004 7 units well 1135017w3 on cross section we3. Well log interpretation principles and applications. Petrophysical evaluation of the available well logs helped in identifying 11 hydrocarbonbearing sands noted as a, a1100, a1200, a2000, b2000, b2100, c3000, c3100, d4000, d4100, and e5000. Well logging and formation evaluation sciencedirect. 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.
I want to let you know about my 10day, emailbased course for you to start learning some hacks on well log analysis. Pdf basic well log interpretation mbereobong archibong. Succeeding chapters 2 through 6 introduce the reader to specific log types. The distribution of coals can be local or continuous, with individual seams extending into adjacent townships or basins. Welllogging correlation analysis and correlation of well. Interpretation principles, archie equation, cross plots density neutron, mn, picket plots, rw water resistivity and salinity determination, and lithology identification. Jul 15, 2012 resistivity logs mfsl, shallow and deep resistivity logs 3. Pdf well logging is a means of recording the physical, acoustic and electrical. Asensor counts the revolutions of a mechanical impeller as the tool descends or ascends in the well. In addiction a sonic log was analyzed for the seco well. Geophysical characterization and borehole geophysical logging. Detail of interpreted facies is given below and facies interpretation is given in fig. Cased hole logs by using quick look methods log interpretation charts to evaluate the formation. Basic well log interpretation chemistry physical sciences.