Analysis of shaly sand reservoir rocks in the eastern. Each of these can furnish a significantly different reservoir evaluation. As a means of investigating this unsatisfactory state of affairs, the development of thinking about the shaly sand problem has been mapped up to the present day. This model is designed to allow silt to be included as a reservoir which may result in more net pay. University formation evaluation class student comments. To meet the need for accurate surveillance in cased holes, the pulsar multifunction spectroscopy system builds on innovative technologies originated by schlumberger to provide the first complete casedhole formation evaluation and reservoir saturation monitoring capability with openholeequivalent measurements. Home course offerings engineering formation evaluation program objectives this comprehensive introductory course is designed to provide solid understanding of the most commonly used openhole logs and interpretation methods. This course will be suitable for all geoscientists and engineers who will benefit greatly from exposure to advanced knowledge and expertise in formation evaluations in clastics. The formation was penetrated by an exploration well rx wherein no core was acquired, and there is no layerwise published data of the petrophysical properties of the r field in the existing literature. Petrophysical interpretation in shaly sand formation of a.
The formation was penetrated by an exploration well rx wherein no core was acquired, and there is no layerwise published data of the petrophysical properties of the r field. The coordination between the formation evaluation of welllogs and the subsurface geology of the. Research article integrated petrophysical evaluation of a. The course provides detailed information about the tools available within geolog for performing formation evaluation using horizontal and vertical resistivity data. A critical analysis is done on the three comparable cases including clean formation as a base case, shaly sand case and laminated shaly sand case towards resolving resistivity anisotropy in a typical shaly sand laminated reservoir. This course tackles the important and nontrivial problem of practical formation evaluation in shaly sand provinces. Eventually we merged the shaly sand and diatomite models so that it was easier to handle the long log sections and field studies which included diatomaceous rocks all diagenetic phases, clean sands, shaly sands, siltstones, mudstones, shales, and calcareous stringers. Jlog petrophysical software formation evaluation software. Shaly sand formation evaluation using a single membrane. Thin layers of sand between shale formations can produce hydrocarbons if the layers. Us20060042369a1 accuracy of shaly sand formation evaluation. The model seems to move in the right direction with an additional 300,000 barrels of oil in place over the 1mineral clean or shaly shaly sand model evaluation made earlier. Shaly sand petrophysics training course petroskills aps.
Of course, the hydrocarbon inplace is obtainable once porosity and water contents are estimated in the formation. T total porosity phit, which includes the pore space in sand and shale. The main emphasis during the course is on practical application rather than extensive discussion around the theoretical background. Petrophysical interpretation in shaly sand formation of a gas. Many solutions currently exist to load, visualize and analyze formation evaluation data from a simple mud log to to nmr, from gamma ray to elemental core data. Petrophysical study and formation evaluation of jake reservoir, block 6, muglad basin, sudan. A us land well was drilled with an 8 34in bit size and completed with 4 12in 11. Normally for evaluation of shalysand reservoir the shale endpoint parallel to dolomite line and perpendicular to the dolomite line to sandstone line the shaleness decrease fig. R ar o w m 1 where r o is the formation resistivity of watersaturated sediment, r w. The following definition and petrophysics model are a typical shaly sand formation model which assumes. According to the survey and research on the logs of these wells, it was become clear that in the asmari formation, there exists laminated shaly sand. Tool enables complete casedhole formation evaluation. However, in shaly formation this approach misleads the results by overestimating the water saturation value due to extra conductivity contribution from clays or shales.
Evaluation of laminated shaly sand sequences in ahwaz oil field using via thomas stieber method and conventional petrophysical logs. Totalporosity is determined using porositylogs, such as density, neutron and sonic logs. Shaly sand intervals in the asmari formation of the ahwaz fields have. Comparison of classical archies equation with indonesian. Basin and covers approximately 10,000 square miles. Shaly material can be distributed in the formation in three ways. Petrophysical interpretation in shaly sand formation of a gas field in tanzania. The 3rd bone spring formation is predominantly shaly sand with intermittently interbedded carbonate layers. Advanced petrophysical evaluation of a lowresistivity laminated. It has since been shown that f is independent of r w only for a certain class of petrophysically simple rocks archie rocks. Petrophysical models and techniques for shalysand formation. An onshore gas field hereafter called the r fieldreal name not revealed is in the southeast coast of tanzania which includes a tertiary aged shaly sand formation sandshale sequences. Shaly sand formation evaluation from logs of the skrugard well, southwestern barents sea, norway. Formation evaluation using wireline logs is an appropriate means to obtain.
Best petrophysics training courses, workshops, seminars and programs in houston texas, dubai uae, london uk, abuja, lagos or port harcourt nigeria, luanda angola or johannesburg south africa for the oil, and gas industry by smartkoncept petroleum. This training course will assist you in understanding how geolog can be used as a tool for performing laminated shaly sand analysis using the lssa application within geolog. We have found that waxmansmits method is a bit more flexible to use in shalysand interpretations in that we can model the waxmansmits cementation exponent m to vary with swb according to the trends observed in the wet intervals from our swb vs. The importance of the interaction between seismology, geology, petrophysics and reservoir engineering will be emphasised and illustrated. Additional critical data are available from the mud engineer and drilling supervisors. Jlog petrophysical software petrophysics software formation evaluation software well log analysis software log analysis software well log interpretation software version 10. This leads to large uncertainties in the apparent sand resistivity even for. Also, i had an experience with evaluating fe software. The presence of clay minerals and shale laminations strongly affects the physical properties of the reservoir rock and induce significant effects on the response of most logging tools. Original article, report by advances in natural and applied sciences.
Evaluation of laminated shaly sand sequences in ahwaz oil. With its user programming, data editing, multiwell interpretation and batch processing capabilities considered, powerlog is perhaps the best valueforthedollar of any formation evaluation software product on the market today. Shale can exist in the form of laminae between which are layers of sand. A novel method to improve water saturation in shaly sand. Shaly synonyms, shaly pronunciation, shaly translation, english dictionary definition of shaly. Txt includes productive shaly oil sands 4,7004,800 feet and coals 4,9005,000 feet. A working knowledge of the geolog software, and of basic petrophysics. Openhole log analysis and formation evaluation book. He formed bayou petrophysics in 1999 and currently consults parttime and provides technical training in shaly sand analysis and other. Sandor, shell international exploration and production b. Evaluation of laminated shaly sand sequences in ahwaz oil field. Shale is the most common, and certainly the most troublesome, rock type that must be drilled in order to reach oil and gas deposits. The conventional resistivity in a laminated shaly sand formation for the sand resistivity r sd of 20. Normally for evaluation of shaly sand reservoir the shale endpoint parallel to dolomite line and perpendicular to the dolomite line to sandstone line the shaleness decrease fig.
Advanced petrophysics training in evaluation sandstone formations. Formation evaluation data are currently available at the well site from many different service sources, such as drilling and geological surveillance, formation evaluation measurement while drilling femwd, and wireline logging. Petrophysical evaluation of shaly sand reservoirs in palougefal oilfield, melut basin, south east of sudan rashid a. I learned the basics of how to read different well logs, must most of all, i can find oil and evaluate pay zones. Heterogeneous shalysand reservoir, integrated petrophysical evaluation, nahr umr formationsubba oil field, permeability, petrophysical parameters calculations introduction nahr umr formation is one of the promising reservoir in southern of iraq.
It may also depend on the way the shale is distributed in the formation. To alleviate the problem of overestimating water saturation by archie many shaly sand interpretation models have been developed that accommodate the. In order to determine the water saturation of a shaly formation, use is made of a formula expressing the relationship between the true resistivity. Openhole log analysis and formation evaluation book osti. Well log interpretation training course petroskills wli.
A new equation is derived that directly relates shaly sand conductivity to the membrane potential. Shaly sand interpretation qed pete 321, sections 501506 spring. Geolog laminated shaly sand analysis lssa emerson paradigm. The formation characteristic is almost the same in all southern iraqi oil fields. Shaly sand formation evaluation from logs of the skrugard. Analysis of shaly sand reservoir rocks in the eastern niger. The shaly sand formation had alternating lowporosity, gasfilled zones and verylowporosity zones. Yet, no one method predominates within the industry. Pdf petrophysical analysis of shaly sand gas reservoir of. This program could help petrophysics engineering to analyze the lss. The evolution of shalysand concepts in reservoir evaluation. Evaluation of shale effect on saturation exponent from well logs in an offshore field, niger delta. Pdf petrophysical analysis of shaly sand gas reservoir. Well logging methods pete 608, sections 600, 700, and 720.
Formation evaluation for shaly reservoirs is a big challenge for any petrophysicists due to the complexity, heterogeneity nature of shale, and shale distributions in the reservoir, where shale severely decreases effective porosity, total porosity, and permeability ruhovets and fertl, 1982, and adversely affects the reservoir quality. Petrophysical analysis of the 3rd bone spring formation. It is based on an inhouse training class, developed for. An integrated formation evaluation approach for maximizing the value of mature shaly sand reservoir a case study from ravva middle miocene reservoir sudipto datta, bernd herold, tim osullivan, kausik saikia and vivek shankar, cairn india limited, kumar praveer, petrofac summary.
The equation is now programmed into every commercial digital welllog evaluation package and is a standard evaluation step for all shaly sands to first make a thomasstieber correction to make a firstorder correction for anisotropy, then apply the waxmansmits equation to take care of the shaliness effects of a now isotropic formation. Shale can include relatively large amounts of organic material compared with other rock types and thus has potential to become a rich hydrocarbon source rock, even though a typical. Petrophysical analysis of shaly sand gas reservoir of titas gas field using well logs. For the reservoir and shale identification the most useful indicator was obtained from the behavior of the density and neutron logs. Quantitative assessment of resistivity anisotropy in. Petrophysical interpretation in shaly sand formation of a gas field in. Evaluation of shale effect on saturation exponent from. Therefore, the effects of clay on porosity and resistivity logs were not accurately incorporated in shaly sands formation evaluation. Electrical properties, petrophysics and formation evaluation. Tool enables complete casedhole formation evaluation, reservoir saturation modeling. Top 10 landmark papers in petrophysics and formation evaluation.
Petrophysical characterization using the considered shaly sand analysis models will enable a better evaluation of the reservoir quality and. The assigned formation for evaluation was the 3rd bone spring sitting immediately above the wolfcamp and located in the leonardian period. Accuracy of shaly sand formation evaluation saudi aramco. Userfriendly, matlabbased integrated platform that combines all previously developed toolboxes modules into one single software utility for interactive 3d multiwell formation evaluation. A properly designed analytical program cores and logs for the evaluation of shaly sands can add significant reserves in existing fields and can allow for the rapid. Shaly sand with intermixed lowporosity gasfilled zones and tight zones. Pdf analysis of shaly sand reservoir rocks in the eastern. The conventional resistivity measurements are generally influenced by the conductive formation. All participants will need to provide their own laptop with excel v2010 or later. It is also suggested that use of crossplots is extremely beneficial in formation evaluation.
Well logging methods pete 608, sections 600, 700and 720, fall 20 page 3 of 10 suggested references bateman, r. Jeff has a bs in geology from lsu and an me in petroleum engineering from tulane university. Top 10 landmark papers in petrophysics and formation. In logging analysis, shaly sand formation evaluation estimates totalporosity, shale and quartz in shalequartz lithologydescription or clay and sand in clay sand lithologydescription, effectiveporosity and watersaturation.
Containing shale, a finegrained, fissile, detrital sedimentary rock formed by consolidation of clay and siltsized particles into thin, relatively impermeable layers. Typically, the formation lithology included minerals which were termed clay or clay minerals. An integrated formation evaluation approach for maximizing. For a considerable time, shaly sand formation evaluation could not accurately quantify clay from standard well logs. Author links open overlay panel saeed parvizi ghaleh a mohsen. Petrophysical evaluation of shaly sand reservoirs in. On the application of simandoux and indonesian shaly sand. Openhole log analysis and formation analysis book osti. The ratio of the resistivity of a rock filled with water r o to the resistivity of that water r w. On the application of simandoux and indonesian shaly sand resistivity interpretation models in low and high rw regimes k. Moreover in case of complex lithologies the advance software tools are really helpful. This petroknowledge training course provides the participant with an intensive training on the concepts of the petrophysical interpretation and well logging.
Hari kumar, ongc summary present paper is a relook at the oil industry practices in making use of the simandoux and indonesian shaly sand resistivity interpretation models for formation evaluation. A novel process and methodology in deterministic formation evaluation is provided. Petrophysics courses, workshops, seminars and programs for. His background has included all aspects of formation evaluation and the application of software to geological and drilling engineering data acquisition and interpretation. Jan 30, 2007 typically, the formation lithology included minerals which were termed clay or clay minerals. As a result of the difference between the hole and casing diameters, the completion has a relatively large cement volume, with a cement thickness greater than 2 in. Jlog petrophysical software petrophysics software formation. Fundamentals of formation evaluation training course. Containing shale, a finegrained, impermeable, sedimentary rock composed of clays and other minerals, usually with a high percentage of quartz. Find out more about shaly sand petrophysics aps course from petroskills.
May 20, 2019 the conventional resistivity measurements are generally influenced by the conductive formation. Us7168310b2 accuracy of shaly sand formation evaluation. Eventually, the results obtained using the shaly sand evaluation techniques, were in better agreement with core and test data. Hydrocarbon are stored only in pore space in sand matrix. The course covers solutions for evalating various shaly sand reservoirs including technqiues and equations. Shale is composed of silt, clay and their bounded water which will not flow. Pdf analysis of shaly sand reservoir rocks in the eastern niger. Summary formation evaluation from well logs in laminated shaly sands has often suffered from lack of proper. The course covers solutions for evalating various shaly sand reservoirs including. Evaluation of laminated shaly sand sequences in ahwaz oil field using via. Science and technology, general hydrocarbons research permeability. Pulsar multifunction spectroscopy logging differentiates. The way shaliness affects a log reading depends on the amount of shale and its physical properties.
Our shaly sand petrophysical model originated about 30 years ago, and was based on several at the time recentlypublished papers on shaly sands. Petrophysical evaluation of shaly sand reservoirs in palouge. Conventional wireline logs often fail to provide a reliable evaluation of reservoir quality and producibility in shaly mud formations, particularly in the shaly gas sand reservoirs of the rocky mountains which are characterized by low porosity i. In the laminated shaly sand sequences, the shaly part of these layers is more conductive than the sandy part which in turn yields incorrect estimation of the hydrocarbon in laminated shaly sand layers. Paul connolly, chief petrophysicist, eog resources houston. University of texas at austin petrophysical and welllog simulator utapwels 3d petrophysics and welllog simulation platform 3d utapwels. Petrophysics of unconventional reservoirs training course. Methodologies used were implemented in techlog software, and a. Advanced formation evaluation in sandstones next training.
The relationship between the resistivity index and the water saturation is also expressed in terms of a single membrane potential measurement. This may be helpful when density log is missing or of poor. Connectivity equation and shalysand correction for. Dec, 2019 an onshore gas field hereafter called the r fieldreal name not revealed is in the southeast coast of tanzania which includes a tertiary aged shaly sand formation sandshale sequences. The formation evaluation results can accurately quantify formation attributes, such as clayvolume, clayboundwater, effectiveporosity and water saturation in shaly sands. Training students for using a commercial formation evaluation software. Sharma center for petroleum and geosystems engineering, the university of texas at austin, cpe 2. Using techlog petrophysical analysis software, a rock physics model was built using regression coefficients derived from measured vp and vs logs in a nearby offset well.
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