Dipmeter is a traditional wireline logging tool that is proved to be very useful in hydrocarbon exploration. The dipmeter advisor system a case study in commercial expert system development reid g. Here we shall detail the method described by schlumberger in their booklet fundamentals of dipmeter interpretation. Unfortunately this method had limited application in more complex geological environments outside the gulf coast, and the dipmeter advisor was primarily used within schlumberger as a graphical display tool to assist interpretation by trained geoscientists, rather than as an ai tool for use by novice interpreters. The dipmeter advisor was an early expert system developed in the 1980s by schlumberger with the help of artificial, this scientific software article is a. This powerful combination enables companies to undertake geophysical mapbased approaches, covering seismic interpretation, well correlation, seismic well tie, seismic attribute computation, and structural framework construction. Structural interpretation of dipmeter results in the gullfaks. Dipmeter not covered in this document shdt hrdip pressure testing devices rft fmt rock and fluid sampling devices cst swc this sort of logging programme could be achieved in 4 or 5 runs over each open hole section, and examples of how this would appear on a well programme are shown below. With more than 4600 entries it constitutes an instant technical reference for both the generalist and the. Search for library items search for lists search for contacts search for a library. Schlumberger fundamentals of dipmeter interpretation schlumberger limited. Developments in petroleum science fundamentals of well. The design of the dipmeter advisor system proceedings of. Many computer programs written for use in the oil field utilize rule based approaches to provide expert systems.
Several faults have been identified, cutting well paths, and dipmeter analysis has allowed. Typical computed results from the sp or resistivity dipmeter are shown below. Laterolog photoclinometer dipmeter log presentation. Congress mines metallurgy and geological technology, paris, october 1935. Ghosh petropysics division, kdmipe, ongc, dehradun india summary dipmeter logging tool has gained acceptance in petroleum industry as a means to define subsurface sedimentary. Barstow schlumberger doll research, ridgefield, connecticut 06877 schlumberger is a large, multinational corporation concerned primarily with the measurement, collection, and interpretation of data. The use of dipmeter logs in the structural interpretation. The following programs are chosen because they illustrate a variety of problem typesand contexts of use. Dipmeter data, borehole image logs and interpretation kris vickerman may 25, 2016 2. Publication date 1970 title variation fundamentals of dipmeter interpretation. The dipmeter advisor a dipmeter interpretation workstation. Topics 2009 edition log interpretation charts collection. The close spacing of these paired electrodes allows a high density of dip results to be achieved, making the tool suitable for detailed stratigraphic interpretation as explained later.
Dipmeter interpretation has been carried out on seven wells from the gullfaks field. Introduction to the sixarm dipmeter and shiva processing. The stratigraphic high resolution dipmeter tool shdt. They have yielded high quality structural information which has contributed to understanding the structural configuration and tectonic history of these fields. A symbol plotted on a dipmeter log used to indicate dip angle and direction. Aq5 is this supposed to be oil base mud dipmeter obdt by schlumberger. Associated interpretation workflows offer the high level of detail that is needed to make operational decision and to increase the predictability of subsurface models. The schlumberger numerical reasoning tests are designed to measure your numerical abilities and relate to graphs, percentages and tables whereby you will be asked to analyse data and chose from a set of multiple choice answers. 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. An instrument that measures both the amount and direction of dip by readings taken in the borehole. Other readers will always be interested in your opinion of the books youve read.
The study of ideas that enable computers to do the things that make people seem intelligent. Application of a modern electrical borehole imager and a new image interpretation technique to evaluate applications of dipmeter and borehole image data in static models the porosity and permeability in carbonate reservoirs. In addition, the dip and strike of crossbedding features is a key element in sedimentology studies of transport direction and facies. Schlumberger dipmeter article about schlumberger dipmeter. Schlumberger fundamentals of dipmeter interpretation. The modern tool is a fourarm device, in which the arms are arranged radially around a central mandrel and are pressed against the borehole wall by.
The dipmeter advisor system a case study in commercial expert. Getting the picture downhole geologists and petrophysicists use image logs to visualize rocks in situ and determine structural geometry and formation properties. Structural interpretation of dipmeter log society of petroleum. A case history from the permian basin, united states. Dipmeter refers to the bedding data depth, dip, azimuth, quality, etc. Dipmeter data, borehole image logs and interpretation 1. Schlumberger c, schlumberger m, doll hg 1935 the electromagnetic dipmeter and determination of the direction of dip of the sedimentary strata crosscut by drilling. Resistivity tools dipmeter dipmeter interpretation vertical dip variation is characteristic of the structure older, simpler version of fmi. Appendix 5a examples of logs with repeat section and calibrations for the most common schlumberger logs pages 355372 download pdf.
Structural interpretations from dipmeter data part 5. The symbol, named for its resemblance to a tadpole a toad in its larval stage of development consists of a circle with a short line or tail extending from it. Isf inductionsonic 200 bitslborehole highresolution. Logging while drilling lwd formation evaluation schlumberger. These will be timed so it is important to practice in advance. Two largescale seismic refraction experiments performed. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. The determination of the dip and strike of beds is a routine measurement in outcrop descriptions as part of field mapping and the resolution of structural geometry and tectonics. Many exploration and production companies have acquired a wealth of dipmeter and image log data.
The advisor was generally not merely an inference engine and a knowledge base of 90 rules, but generally was a fullfledged workstation, running on one of xeroxs 1100 dolphin lisp machines. Log interpretation principlesapplications schlumberger. Published in 1991, log interpretation principlesapplications provides a thorough background of log interpretation. Well test interpretation introduction 1 from its modest beginnings as a rudimentary productivity test, well testing has progressed to become one of the most powerful tools for determining complex reservoir characteristics. Schlumberger fundamentals of dipmeter interpretation in. The aim of dip measurements, or dipmeter logs is to determine the angle to the horizontal and the azimuth referenced to magnetic north and geographical north of the dip of the planes cut by the well. Earth modeling q mud weight selection s geology and geophysics workflow. This fifth book in the schlumberger testing services set summarizes the state of the art in well test interpretation. The dipmeter advisor system a case study in commercial. It utilizes dipmeter patterns together with local geological knowledge and measurements from other logs. The dipmeter advisor a dipmeter interpretation workstation gordy g.
Dipmeter data, borehole image logs and interpretation. In the general case, a catalog of field examples of dip plots from various known depositional environments is a valuable aid to stratigraphic dipmeter interpretation. Schlumberger log interpretation principles and applications. The stratigraphic high resolution dipmeter tool shdt schlumberger falls within the group of 4arm dipmeter tools. Structural interpretation of dipmeter log a case study from. Evolution of the schlumberger dipmeter pad designs from the early days up to just before the invention of the resistivity image log. Conrad and marcel schlumberger, to develop electrical methods of mapping the subsurface. It is a typical example of the class of programs that deal with what.
Objective the aim of this log is to determine the angle to the horizontal and the azimuth referenced to magnetic north and geographcal north of the dip of the planes cut by the well. Rda dipmeter interpretation software runs on windows 98, nt 40 and higher plots include dip logs, polar plots, fold axis plots, tangent diagrams, rose plots, stick read more free basic download software geotechnical. The rules are taken from an expert working in the field and are written in a way that attempts to reproduce the knowledge and approaches used by. Schlumberger tests 202021 practice tests free aptitude tests. The balance of the examples were contributed by the editor and the following individuals from the standard of california family. Structural interpretation of dipmeter results in the. Pdf poor seismic imaging in the vicinity of salt domes is a wellknown. 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. The various openhole services offered by schlumberger are discussed in some detail, together with essential methods of interpretation and basic applications.
Structural geology and sedimentology from dipmeter data. Artificial intelligence at schlumberger semantic scholar. Structural and stratigraphic interpretation of dipmeters and boreholeimaging logs ssi. A solid black dot shows good data, while an open circle indicates a less reliable measurement.
Abstract the dipmete advisor prograr m is an application of al and expert system techniques to the problem of inferring subsurface. Easily share your publications and get them in front of issuus. Orientation and style of major and associated minor faults have been investigated using dipmeter results. Dipmeter also refers to an older tool with 4, 6 or 8 buttons borehole image logs refer. Schlumberger dipmeter interpretation ebooks schlumberger dipmeter interpretation thank you for reading schlumberger dipmeter interpretation. The dipmeter tool records microresistivity measurements which are used to determine the dip and strike of resistive features in the subsurface. Structural interpretation of dipmeter and image logs is an essential technique to. Dipmeter logs have been processed in a variety of ways as an aid to understanding the geology of the north and south morecambe gas fields. This course provides numerous handson exercises and case studies that emphasize sedimentologic, stratigraphic, and structural applications of these widely run, but. This study therefore emphasises the importance of using dipmeter results as a supplement to seismic for the purpose of structural interpretation. Schlumberger glossary pdf apple, app store, ipad, iphone, ipod touch. The dipmeter advisor system 11 attempts to emulate human expert performance in an important and specialized oil welllog interpretation task. Pdf dipmeter and borehole image log technology researchgate. Areas of modern sediments in shallow water are shown in yellow and orange, modern deepwater sediments in blackhatched lines.
The dipmeter advisor program was developed using logs from the us gulf coast area and has begun to display a level of competence for that region comparable to that of a newly trained human interpreter. Baker schlumberger doll research old quarry road ridgefield, connecticut 06877 abstract we discuss commercial expert system development, using our experience with the dipmeter advisor system as a case study. The dipmeter advisor was an early expert system developed in the 1980s by schlumberger with the help of artificialintelligence workers at mit to aid in the analysis of data gathered during oil exploration. Structural interpretation of dipmeter and image logs is an essential technique to locally calibrate seismic maps and capture gross rock volume. The key objective of dipmeter and boreholeimage interpretation is to describe structural and stratigraphic features encountered by a wellbore, commonly in the absence of core. The system is currently being used in a small number of schlumberger field log interpretation centers as an aid to human dipmeter interpreters.
The dipmeter advisor system is the result of a four year effort by schlumberger to apply expert systems technology to problems of welllog interpretation. Schlumberger, 1986, dipmeter interpretation fundamentals. Dipmeter logging tool has gained acceptance in petroleum industry as a means to define subsurface sedimentary. Hobson, editor, developments in petroleum geology no. Reddy, bruce buchanan, penny niiwith schlumberger interpretation specialistsjean dumanoir, george coates, chris clavier, al gilreath the result was selection of a first application of ai te chniques interpretation of data from the dipmeter tool. The density of detected faults, one per 140 m from dipmeter results, proves the presence of an intensely faulted area. Reddy, bruce buchanan, penny niiwith schlumberger interpretation specialistsjean dumanoir, george coates, chris clavier, al gilreath the result was selection of a first application of ai te chniquesinterpretation of data from the dipmeter tool. Image data help them analyze reservoir properties such as heterogeneity, sedimentary conditions and structural features, including fractures, folds and faults. Dipmeter advisor an expert system schlumberger s dipmeter advisor system attempts to emulate human expert performance in dipmeter interpretation. It uses four paired electrodes side by side to record eight microconductivity curves.
May 31, 2016 dipmeter data, borehole image logs and interpretation 1. Dipmeter interpretation using geometric constructions. Dipmeter caliper temperature acoustic fmi m myna ero spontaneous potential sp one of the oldest logging measurements used commercially in 1931 discovered as noise in resistivity found to be related to presence of sandstone lithology tool surface down hole the well works like a battery e k log. Schlumbergers dipmeter advisor system attempts to emulate human expert performance in dipmeter interpretation. Maybe you have knowledge that, people have search hundreds times for their favorite novels like this. Developments in petroleum science fundamentals of welllog. Although rare, examples can be found in files for wells drilled in the 1940s. Structural interpretation of dipmeter log a case study.
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