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Technical TrainingGeoSystems key personnel have a long history of technical training in the petrographic evaluation of reservoirs. This technology transfer results from the writing of technical papers, presentations at major conventions and society meetings and short courses. Topics range from applications of petrographic analysis, studies of deposition and diagenesis, formation damage, to integrated core and log evaluation. Many of these courses can be tailored to meet the specific objectives of the client. Click HERE for upcoming events. Technical PresentationsThe following abstracts describe various technical presentations currently provided to the oil and gas industry. Each presentation is approximately 45 minutes in length. These presentations can be customized to address specific issues as desired. Abstract: Enhanced Understanding of Pore Level Attributes Most of the parameters that affect our ability to understand reservoir performance are controlled at the pore level. The characterization of pore level attributes provides for an improved understanding of reservoir potential and performance characteristics, effective storage capacity, saturation distribution, reservoir sensitivities, and for improved interpretations of wireline logs and production data. This presentation describes the basic concepts of pore geometry classification and how variances in these attributes affect log response and well performance. Methods are described by which these attributes can be recognized from rock samples and wireline logs and applied with other petrophysical measurements to improve overall reservoir characterization efforts. Examples are provided demonstrating these applications. Abstract: Reservoir Characterization by Rock/Log ModelingTypically, geologists and engineers must learn to use a limited data set to establish a drilling strategy that will provide optimum results. While it is understood that the characterization of pore level attributes from rock material provides for an improved understanding of reservoir potential and performance characteristics, many times this material is not available or is too expensive or risky to obtain. Improved interpretation can be achieved by the integration of rock and log data from a selected well(s) and the development of a rock/log model that allows for prediction of the petrophysical rock properties in non-cored wells or intervals from log data only. This approach allows for an improved understanding of permeability and saturation distributions within the reservoir. Based on geological input, the reservoir can then be divided into hydro dynamically continuous layers (flow units) for improved understanding of OOIP and producibility. When combined with production data, the improved characterization and predictability of performance obtained by this approach provides a means of targeting the highest quality development drilling locations, rapidly recognize conformance and formation damage problems, identify bypassed pay intervals and gather an improved assessment of present and future value. This presentation describes the methods used to derive an effective rock/log model and provides examples of its application. Abstract: Optimizing the value of percussion sidewall cores & cuttings Various types of formation samples are available to help in reservoir characterization efforts. These include conventional cores, rotary sidewall cores, percussion sidewall cores and cuttings. Each type of rock material has it’s own distinct advantages/disadvantages and should be considered when deciding on an effective evaluation program. While conventional cores obviously provide the optimum type of formation material, issues such as zone thickness, wellbore conditions, and costs are all factors that need to be incorporated into this decision. By understanding the use and limitations of each type of formation rock material, geoscientists can make decisions that will meet their particular evaluation objectives. Percussion sidewall cores and cuttings samples commonly are the only samples of reservoir rocks and seals that are available for analysis and can be extremely valuable for purposes of reservoir evaluation in both carbonates and sandstones. Detailed microscopic analysis of percussion sidewall cores and cuttings samples can be used to successfully characterize 1) environment of deposition, 2) formation sensitivity, 3) formation producibility, 4) quality of reservoir seal, and 5) mechanical properties of formation and surrounding barriers. Abstract - Petrophysical Evaluation of Gas-Shale ReservoirsPetrographic analysis of shale samples provides a portion of the data set necessary to define reservoir potential and establish a drilling strategy that will provide optimum results. The evaluation of shale reservoirs combines the evaluation of several important parameters and includes petrophysical (core and logs), petrographic, geochemical and mechanical property data. All data types are important in defining reservoir potential, targeting zones with the greatest potential and for comparing shale reservoirs from different provinces. Unless all key parameters are favorable, it is unlikely that economic production can be achieved. This presentation will discuss each key element’s importance in understanding productive potential and outline evaluation efforts necessary to properly characterize a gas-shale reservoir. Abstract: Identification Of Additional Pay Through Log/Core IntegrationHydrocarbon bearing zones are overlooked and not perforated because either they are incorrectly identified as non-pay or were not economic at the time of the original completion. Misidentified opportunities are the results of interpretation problems with the logs caused by 1) thin bed effects, 2) dispersed clay effects, 3) pore structure effects or 4) mineral effects. This presentation outlines a cost effective method for the identification of these bypassed pay zones resulting in increased development potential in existing reservoirs and fields. The shaley sand reservoirs described form the principle reservoirs in the Gulf coast region. This presentation will show examples of interpretation problems encountered in both onshore and offshore reservoirs and provide specific recommendations to minimize by-passed pay. Abstract: Petrophysical data from Cuttings and Percussion Cores (GeoSystems Pore Attribute Characterization – GPAC Analysis) Petrophysical data is a key element in understanding reservoir performance. Unfortunately wireline logs cannot accurately characterize certain important properties such and permeability. When this data is needed to understand reservoir performance but obtaining conventional or rotary cores is not possible or practical, the study of cuttings by imaging techniques can prove beneficial.
GPAC and other petrographic analysis methods applied to cuttings and percussion cores when integrated with wireline logs provide a cost effective, quantitative method for understanding petrophysical properties and expected performance characteristics. This presentation describes methodology used to define petrophysical properties from cuttings and discusses issues related to accuracy in data.
For further information regarding our services, please contact us at: Phone: 281-358-2662 Email: info@geosystemsllp.com
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