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EAGE Conference on Reservoir Geoscience
- Conference date: December 3-5, 2018
- Location: Kuala Lumpur, Malaysia
- Published: 03 December 2018
1 - 20 of 87 results
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Paleogeographic Reconstruction Based On Tectonostratigraphic And Halokinesis Evaluation, Nw Kuwait
Authors A. Amer, A. Sajer, T. Al-Adwani, H. Al-hebail, H.H. Al-Shammari, A. Abdullah, B. Chakrabarti and S. MajumdarSummaryThe objective of this work is to reconstruct the paleogeographic distribution of the depositional facies of the Late Triassic to Late Jurassic, namely Minjur, Marrat, Dharuma, Sargelu and Najmah formations over the Mutriba structure, North West Kuwait. This paper suggests that during the Late Triassic, Mutriba structure was dominated by extensional tectonics that resulted in a NW-SE trending graben and horst system. This was followed by halokinesis as a result of changes in sedimentary load and basement activation during the Early-Lower Jurassic. During the Late-Lower Jurassic strike-slip kinematics dominated the area and during the Early-Upper Jurassic the strike-slip tectonics was aborted as a result of halokinesis and tectonic reactivation. The Late Jurassic was dominated by transpressional tectonics and the inversion of some faulted.
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Fault Seal In Sabah Deep Water Fields
Authors M. Sarginson and T. KiviorSummaryReview of fault seal in Sabah deep water fields. Examples of static fault seals controlling hydrocarbon distribution, and fault baffles affecting field production performance are presented.
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Reservoir Properties Of Proximal To Distal Deep Water Turbidites — Sabah, Malaysia
Authors H. A. Ghaffar, T. Prasetyo, G. Henderson, D. Stanbrook and M. SarginsonSummaryHydrocarbons in deep water Sabah are reservoired within an approximately 500m thick sequence of Late Miocene (H110 to H160) turbidite lobes that are interspersed with mass transport deposits. These deep water clastic sandstone reservoirs vary in thickness and reservoir quality, which impacts prospectivity across several fields spanning 45km along depositional dip from a proximal to distal setting. In this paper we investigate the factors controlling reservoir properties and diagenesis in a proximal to distal turbidite depositional environment in the deep-water Sabah Baram Delta province.
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A Geomechanics-Based Solution To Decipher Salt-Related Deformation In Lower Congo
Authors X. Legrand and J. ShahSummaryPost-salt reservoir targets are a major focus for oil and gas exploration in passive margins with much consideration directed to lower part of Post-Rift Sequence. At reservoir scale, the entrapment structural style is closely linked to Salt which is considered as a visco-plastic layer and high variation of the paleo-topographic profile. Moreover, the quality of seismic imaging around thick and complex salt bodies is poor. Therefore, an innovative method using a geomechanics based restoration to refine the structural interpretation was proposed to decipher the complex salt-related deformation process and was used in Lower Congo Basin. The refined geological model highlights different structural styles governed by two main components that are the salt thickness and the detachment slope. The identification of gliding and spreading in gravity driven forces was demonstrated to be a good indicator to assess structural traps in otherwise complexly deformed the post-salt sediments.
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Deciphering Deformation History Of Overturned Strata Along A West Crocker Formation Outcrop (Ne Borneo, Malaysia)
Authors C. Giraldo and J. ShahSummaryIn order, to unravel deformation history of the overturned strata a systematic procedure has been followed: Unfolding strata back to normal position and restoring them using a 2D geomechanics software. Faults formerly considered as strike-slips and thrust faults contemporaneous to Miocene Borneo orogeny here they would be interpreted as syn-sedimentary gravity-driven deformations which suggests an Oligocene-Miocene in age and contemporaneous to West Crocker Formation sedimentation.
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Repeat Logging Using Distributed Acoustic Sensors And Earthquakes
Authors R. Pevzner, B. Gurevich, K. Tertyshnikov, A. Pirogova and S. GlubokovskikhSummaryRepeat downhole measurements of elastic properties would be extremely valuable for constraining 4D seismic inversion. However, intervention into wells to conduct such measurements is difficult and, in rarely used in practice. Distributed fiber optic sensing allows monitoring changes of formation properties, which could affect properties of the fiber-optic sensor: alter refractive index, cause physical deformation or the way the laser pulse is scattered. DAS is already often used to monitor production noise, microseismic activity and used as a sensor in 4D VSP surveys. In this presentation we demonstrate how distributed acoustic sensing could be used to monitor changes in elastic properties of the formation by monitoring local changes in seismic wave amplitude.
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Avo Analysis Using Walkaway Vsp In Offshore Malaysia: A Case Study
Authors N.L. Rafiuddin, S. Mohamed Taha and S. Saad ElkurdySummaryThis study aims to analyse AVO effect at the reservoir levels using common receiver gathers from a walkaway VSP. We present a step-by-step approach for seismic interpreters to further leverage on their VSP data, beyond the common time-to-depth relationship. The result of this study is an analysis of the reflectivity, R, with incidence angle θ, as well as intercept and gradient values. Results show that we have varying intercept and gradient values for two orthogonal source lines, which demonstrates the influence of anisotropy towards the AVO.
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Matching Pursuit Fourier Interpolation Of Borehole Seismic Data And It Is Application In Multi Offset Vsp Imaging
Authors F. Exton, K. Galybin, B.J. Lim and S. MoriceSummaryThis paper provides a description of the integrated approach of borehole geophysics together with surface seismic workflow practice, which is implemented to achieve beyond of conventional processing technique to derive the 2D reflection Image. This approach maximized the value of the existing intermediate VSP section which was acquired sparsely, by interpolating the “gaps” with seismic wavefield.
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Joint Imaging Of 3D Fiber Optic Das Vsp And Obn To Solve Shallow Gas Cloud Problem In Bokor Field Malaysia
Authors M.F. Abdul Rahim, A.R. Ghazali and M.D. DavisSummaryIn this paper we implement a Joint Imaging of the 3D fiber optic DAS VSP and OBN to improve imaging below gas cloud to enable better reservoir characterization. This survey simultaneously acquired 3D seabed nodal seismic and 3D Distributed Acoustic Sensing (DAS) Vertical Seismic Profiles (VSP) using fiber optic in three adjacent deviated offshore production wells. Production was not suspended during the VSP acquisition, so the resulting data was contaminated with production “noise” which varies with depth and over time. From the joint imaging results, better delineation of faults and reflector continuity can be seen in areas previously effected by the shallow gas cloud. The VSP data has a higher bandwidth at reservoir level compared to the OBN dataset.
This could be attributed to the undershooting below the gas cloud and proximity of the VSP receivers to the reservoir.
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Application Of The Play Based Exploration Workflow To Predict Source Rock And Reservoir Sequences In The Synrift Section Of Continental Rift Basins
By R. ShoupSummaryThe synrift section is a wholly contained petroleum system in continental rift basins. The foundational element of the petroleum system is the source rock. The distribution of the source rock and reservoir facies in a continental rift basin are controlled by climatic factors and the geometry of the rift basin. There are three archtypical rift basin geometries, asymmetric half grabens, symmetric grabens, and compound rift basins. The stratigraphic succession of the synrift section in continental rift basins typically exhibit eight sedimentary depositional environments. The lateral and vertical distributions of these depositional environments are remarkably similar from basin to basin and therefore offer a predictive model for defining the source rock and reservoir sequences. There are two source rock facies in continental rift basins, algal-rich lacustrine shales and more humic-rich shales deposited in swamp environments. These source–prone facies are generally found near the deepest portion of the basin and the asymmetric basin flanks. Reservoir facies are found in fluvial, delta and shoreface, and fan delta sequences, as well as the transitional red bed sequence that overlies many continental rift basins.
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A Strategy To Reduce Dry Holes By 25 To 50%
By R. ShoupSummaryThis paper will examine the principal causes of dry holes and will present a two-part strategy that companies can implement to reduce the number of dry holes they drill . Conducting pre-drill audits can reduce your dry holes by 25 to 50% Studies have shown that approximately half of the dry holes that were drilled were dry due to failure of the trap or seal Audits of the maps that were the basis for drilling the well indicate that the majority of wells attributed to trap or seal failure were actually drilled on invalid structure maps Conducting regional reviews or mentoring sessions can further reduce your dry holes Although it will be virtually impossible to eliminate all dry holes, conducting regional reviews or conducting mentoring sessions with your interpreters will hold them accountable for understanding the petroleum system. Mentoring sessions allow your staff to benefit from the knowledge of experts who can bring a fresh perspective and new insights to help your interpreters better understand of the petroleum system, and improve their maps and evaluations, helping you reduce risk and improving your exploration drilling success.
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High But Unrecognized Potential In Permian Carbonates Of Southeast Asia
Authors F. Xue and T. KanitthornSummaryPermian carbonates have very high hydrocarbon potential in Southeast Asia. At first, they have very high single-well productivity, up to MMBOs and hundreds of BCFG in cumulative. Secondly, they have thick and extensive distribution through much of the Southeast Asia. They consist the basement plays under Mesozoic basins in onshore areas represented by Sinphuhorm Field and under Cenozoic basins in offshore areas represented by Nang Nuan Field. But E&P in this play has been not successful due to the limited knowledge on the extreme and extensive heterogeneity in Permian carbonate. The advance carbonate reservoir characterization in these two field has illustrated that large cavities (caves) are the main contributor to the high productivity and their uneven distribution in tight matrix leads to highly uneven distribution of reserves and productivity in carbonate reservoirs. The surface and subsurface G&G data has illustrated that caverns are widely distributed in both orogeny and basin provinces of Southeast Asia. With proper knowledge and approach, Permian carbonates will become an important play in Asia petroleum E&P.
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Subsurface Reservoirs Imaging Through Characterization And 3D Modeling
More LessSummaryPresentation of an integrated modeling workflow that take in account all of the available data (static and dynamic) to build a 3D integrated geological model for the subsurface reservoir.
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Cased Hole Saturation Logging To Identify Bypassed Oil Opportunities - Case Studies From The Sarawak Basin
Authors A. Griffin, R. Gunarto, S.H. Zamridin and S. AlawiyahSummaryMurphy Oil Company operates a number of mature oil and gas fields in the Sarawak Basin, Malaysia. It has been utilizing a new generation pulsed neutron tool (“PNT”) to help track production related fluid changes and identify bypassed oil. This paper summarizes case studies from 2 wells, using the PNT tool for saturation logging and interpretation, and the production benefits identified. Field A results include the identification of a displaced gas-leg and a basal swept zone. The well was successfully recompleted in the original gas-leg with production of 1000 BOPD and low GOR. Limited water production commenced several months later, consistent with the PNT results. Oil movement to the gas cap was identified accurately using the PNT log as confirmed by well testing and production. Field B was logged over 3 reservoirs and two recompletion targets were identified. Reservoir B1 has a full oil-leg below the original GOC with no evidence of water-sweep. Reservoir B2 is thin-bedded with ambiguous hydrocarbon fill; logging results indicate that this zone is oil-bearing. It is planned to complete both zones as oil producers utilizing a single production string configuration with zonal selectivity, increasing field production and accessing additional, previously undeveloped, reserves.
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Integration Of Stochastic Inversion And Rock Physics To Detect The Upper Miocene Thin Gas Sand In The Nam Con Son Basin, Vietnam
More LessSummaryThe Nam Con Son (NCS) basin is the second ranked in term of HC reserve in Vietnam after the Cuu Long basin. To find out more clastic reservoir zone, in particular the thin gas sands, is a need as the oil production from the main contributor of fractured granite basement is more and more reduced. In this study, integration of stochastic inversion and rock physic cross-plotting results could enable to highlight a thin gas sand in seismic section in Upper Miocene, which might be easily missing in a normal seismic interpretation. It is recommended such an integrated method can be tested and applied more in exploration practice in the NCS basin, Vietnam.
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Mitigation Of Structural Uncertainty In High Angled Dipping Middle Marrat Reservoirs With The Help Of Deep Electro-Magnetic Inversion Geosteering Technique, Calibrating With Seismic Data- A Case Study, Umm Gudair Field, West Kuwait
Authors D. SinghaRay, A. Al Shemali, R. Quttainah, N. Al Mutairi, S. Noreldeen and C. KeotSummaryMarrat Jurassic reservoir in Umm Gudair Field, West Kuwait is characterized as deep and tight carbonate limestone reservoir. Most vertical wells are low producers due to poor reservoir properties in addition to the reservoir pressure depletion. In order to enhance Middle Marrat reservoir productivity, the practice of horizontal drilling is being adopted. However, boundary navigation and optimizing the drainhole within the desired target layer poses the biggest challenge in this regard.
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An Integrated Approach For Acidising Job Design Via Rapid Mineralogy Analysis
Authors H.X. Dan, N.S. Sadan, L.C. Chisholm, A.M. Abu Bakar and D. BurkettSummaryThe study scope was to identify a compatible acid type for removing HEC Pills (LCM materials) and to formulate non-damaging acid systems to the specific formation mineralogy. In order to complete this, the mineralogy of the targeted reservoirs would be required to identify the presence of any unstable clay types which would react with acid. Some of the petrographic study results from major reservoirs that had core taken showed abundant presence of unstable clay types, such as chlorite and mica. Due to the absence of conventional core for the undeveloped reservoirs, cuttings were instead used and petrographic studies were carried out. Due to the constrained timeline the project team opted for mineralogical analysis using a portable X-ray diffraction (XRD) instrument. The results would later be compared with traditional laboratory powdered XRD analysis which determine the types and quantitative bulk composition of clays present in the sample. As petrographic studies are dependent on sample preparation, some variations in qualitative and quantitative mineralogy were observed between petrographic analysis and XRD analysis. Nevertheless, portable XRD was able to identify the presence of similar minerals with rapid analysis and this could be adapted for potential wellsite use in the future.
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Dual-Ing With Julimar: An Innovative Approach To Develop A Stacked Reservoir System
Authors C. Fields, Z. Dholkawala, S. Bunton, M. Roets, M. Wallwork, N. Mews, H.M. Lee, U. Wong, L. Abbott and S. BeecroftSummaryThis presentation discusses the Julimar Development Project (Julimar and Brunello gas fields), in particular, Phase 2. This proposed phase of development includes four intelligently controlled, dual zone open-hole gravel pack wells. This is the first application of this technology in gas wells globally.
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Improved 3D Anisotropic Csem Cross Gradient Structural Inversion Incorporating Resistivity Logs And Seismic Horizons
Authors M.A. Meju, A.S. Saleh, R.L. Mackie and F. MiorelliSummaryCross-gradient constraint is used in 3D anisotropic resisitivity inversion to improve structural similarity between horizontal and vertical resistivity models. The methodology has been tested at controlled field-site in a deepwater fold-thrust belt geological environment with encouraging result.
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Multi-Physics Workflows For Quantitative Interpretation Of Seismic And Csem Data
Authors L. MacGregor, K. Nichols, J. Tomlinson and R. KeirsteadSummaryIt is well known that combining multiple geophysical data types in rock physics-driven multi-physics workflows can improve the robustness of reservoir property estimations. For example, the integration of prestack seismic inversion attributes with controlled source electromagnetic (CSEM) data has been shown to dramatically improve the certainty with which commercial hydrocarbon saturations can be distinguished from reservoirs containing only residual saturation, a problem that is hard to address with seismic methods alone. However there are many approaches to multi-physics analysis. The choice of approach depends on the data available and the geophysical objective of the analysis. Here we present a staged workflow for quantitative characterisation of reservoir properties using seismic and CSEM derived attributes.
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