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APGCE 2019
- Conference date: October 29-30, 2019
- Location: Kuala Lumpur, Malaysia
- Published: 29 October 2019
21 - 40 of 99 results
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UNLOCKING KLIAS EXPLORATION OPPORTUNITY
More LessSummaryPETRONAS embarked on aggressive studies. The result of the study is relatively remarkable for the purpose to unlock the prospectivity of the frontier onshore Klias Peninsula. The new seismic data, geochemical analyses, FTG, structural restoration and basin modeling have provided a better understanding of the geology of the Klias Peninsula that could fascinate exploration activities to explore the hydrocarbon potentiality. MPM as the opener and shaper of the exploration activities for the frontier areas believed that there is value creation for the exploration from onshore Klias Peninsula and the surrounding area in future.
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AN INTEGRATED APPROACH OF 3D STRATIGRAPHIC FORWARD MODELLING AND SEQUENCE STRATIGRAPHY TO PREDICT RESERVOIR HETEROGENEITY IN SUBMARINE FAN OF DEEPWATER SABAH
Authors M.R. M Radzi, W. Ben Habel, S. Jirim and S.N.A. Syed KhastudinSummarySubmarine fan and related deep marine deposits consist of estimated 15% of the world proven total oil reserves in clastic dominated hydrocarbon systems ( Richards et al, 1998 ). Northwest (NW) Borneo is one of the prolific oil and gas province attributed from deep marine deposits with Kamunsu, Kinarut and Kebabangan are the proven main reservoir intervals. Despite of their high hydrocarbon potential interval, complexity of predicting reservoir distribution and continuity remain as a challenge in this area. These uncertainties could be reduced by integrating result of sequence stratigraphic study and 3D stratigraphic forward modelling (SFM). Stratigraphie forward modelling (SFM) demonstrates its applicability in exploration by providing a highly predictive stratigraphic framework. By integrating 3D SFM and sequence stratigraphy analysis, it will be able to provide guidance on subsurface lithofacies distribution in the area that can be used to derisk reservoir presence to support the drilling of identified prospect in deepwater Sabah.
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DIGITAL ANALOG INTELLIGENCE HELPS MITIGATE E&P RISK
Authors S. Sun, J. Faroppa, S. Wu and B. ZhengSummaryBased on the structured and regularized data, DAKS provides insight, intelligence and solutions to support E&P decision-making through its global field and reservoir knowledge base, pioneering classification scheme and powerful set of analytics tools. With the analytics and intelligence, geoscientists, reservoir engineers and portfolio managers will be able to quickly and efficiently expand their own experiences and be more creative to minimize the risks and achieve superior performance. The author will present case studies to demonstrate how DAKS digital intelligence has been applied in identifying prospect critical risks, calibrating subsurface uncertainties ( Figure 2 ), validating reservoir models and development concepts, and mitigating E&P risks with examples from the Gulf of Mexico, South Atlantic Margin Basins, and the North Sea.
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SURVEY DESIGN IN ANISOTROPY MEDIA FROM FOCAL BEAM ANALYSIS
Authors A.H. Abdul Latiff, Z. Mohd Zaki and W.I. Wan YusoffSummaryThe insufficient sampling parameters will result in an acquisition footprint on time slice, low resolution, unreliable angle-dependent reflection amplitude (AVP-information), low signal to noise ratio and incorrect velocity estimation. One way to design a reliable seismic survey is through the focal beam method, where it has the advantage of analysing resolution and AVP imprint caused by incomplete acquisition design. In addition, the focal beam analysis able to determine the seismic contribution from either the receiver or the source side only. While the focal beam method is extensively used in homogeneous and heterogenous media, the application in inhomogeneous medium and extending them to anisotropy medium can increase the focal beam analysis value.
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PREDICTING PORE PRESSURE WITHIN BARAM DELTA OVERPRESSURED ZONE
Authors W.A. Wan Mohd Kamil and F. WijnandsSummaryUndercompaction plays an important role but secondary mechanisms appear to be active. Based on acquired data and geological knowledge, we speculate that vertical/lateral transfer of pressure, controlled by impermeable shale (some as thin as 10 m) and small faults (possibly occasionally reactivated) control the present day deep pressure regime in the Baram Delta.
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HIGH SLANTED DEVELOPMENT WELLS TURNED RISKY PROSPECT TO RESERVES IN BONGKOT MATURE GAS FIELD, GULF OF THAILAND
By N. SukkeeSummaryMore than two decades of Bongkot field production, conventional resources/reserves have been produced. Lowest investment was considered to the infill development program with challenging well designs. In 2018, drilling operation of high slanted development wells was completed successfully. This project illustrated the efforts of the operator to propose innovative solutions to save cost and ensure sustainable additional development for a mature Bongkot field.
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EARTH MODEL BUILDING FOR THE DEEP-WATER FRONTIER EXPLORATION AREAS OFFSHORE SABAH, MALAYSIA
Authors R. Chakraborty, G. Menzel-Jones, A. Sazykin, N. Adelman, M. Tham, D. Barlass and R. DixitSummaryRecent interest in the Malaysian deep-water acreage created a requirement to build reliable regional interpretation over large prospective areas and led to a broadband multimeasurement towed-streamer acquisition of over 19,500 km2 offshore Sabah. In this work, we discuss the overall earth model building strategy that enabled creating a high-quality, high-resolution, contiguous earth model and broadband images over a large area of considerable geologic complexity and variation. We emphasize the importance of interpretation-guided anisotropic earth model building to enhance prospect evaluation in this underexplored and frontier exploration province, proximal to successful exploration trends within the Sabah thrusts zone and Luconia carbonate shelf.
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OLIGOCENE AND MIOCENE SEQUENCE STRATIGRAPHY OF THE NORTH MALAY BASIN, MALAYSIA AND THAILAND
Authors G. Brink, J. Hernandez, J. Bencomo, L. Jiang, N. Koronful, D. Basu, A.Z. Ishak, M.F. Ali and J. SkulsanjutrSummaryExploration activities in the Malaysia Thailand Joint Development area have been conducted since 1971 and nine gas fields are currently producing at relatively shallow stratigraphic levels of late Miocene age. The sequence stratigraphic study area covers 7250 Km2, which includes an area covered by some 300 wells, 6400 km2 3D surveys and 10664-line Km of 2D seismic. We have established a seismic and sequence stratigraphie framework, validating depositional systems through time and synthesizing various chronostratigraphic schemes published to date.
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APPLICATION OF ITERATIVE LEAST SQUARES MIGRATION IN DIFFERENT GEOLOGICAL SETTINGS
Authors Ø. Korsmo, S. Arasanipalai, Z. Greplowski and M. FaroukiSummaryLeast-squares migration has over the last few years become the new standard in high-end seismic imaging. In this paper we utilize iterative least-squares migration in different geological settings from shallow complex structures to deeper sub-chalk and sub-salt targets. We evaluate how least-squares migration can improve the wavenumber content, suppress illumination effects from acquisition design and velocity anomalies and reveal finer structural detail compared to conventional migration. By utilizing the one-way extrapolators, the inversions can be done for the full frequency range supported by the data at an acceptable cost.
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IMAGING THROUGH COMPLEX SHALLOW GAS WITH FULL-WAVEFORM INVERSION TO ENHANCE THE DATA INTERPRETABILITY OF THE DEEPER TARGETS IN THE TARANAKI BASIN, NEW ZEALAND
More LessSummaryThe Western Platform 3D survey is in the Taranaki Basin, offshore New Zealand. The survey was designed and positioned to provide a high-resolution 3D broadband data set on trend to and over multiple oil and gas fields to provide new insights into and allow better analysis of proven and unproven plays. The client’s needs in the region to identify residual hydrocarbons beneath shallow gas clouds within complex stratigraphic intervals led to Schlumberger providing a detailed bespoke workflow to address the imaging issues encountered in legacy datasets. The legacy imaging efforts have suffered due to being unable to overcome the presence of multiple geological challenges. To address these challenges, full-waveform and common image point tomography were performed to derive a high-resolution velocity model. Q-FWI was used to derive a detailed Q model representing the shallow gas bodies. In this case study, we demonstrate the successful application of diving-wave FWI, Q-FWI, and FWI using reflection energy to resolve a high-resolution velocity and Q model. This detailed model enabled the final imaging performed with Q-Kirchhoff prestack depth migration to compensate for the complex kinematics and gas-related absorption effects observed in the survey.
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PERMANENT DOWNHOLE SEISMIC MONITORING FOR CO2 GEOSEQUESTRATION: STAGE 3 OF THE CO2CRC OTWAY PROJECT
Authors R. Pevzner, S. Glubokovskikh, K. Tertyshnikov, S. Yavuz, A. Egorov, E. Sidenko, S. Popik, L. Ricard, J. Correa, T. Wood, B. Freifeld and B. GurevichSummaryTime lapse (TL) seismic plays a key role in monitoring of changes in the subsurface caused by reservoir production or CO2 geosequestration. However, applicability of the TL seismic is limited by several factors, which include: relatively high cost; relatively high degree of invasiveness and associated land access issues; sparseness in time and usually significant delay between the acquisition and availability of the interpretable data. Stage 3 of the CO2CRC Otway project is aiming to address these issues through deployment of a permanent seismic monitoring system built on a combination of permanent orbital vibrators and multiple closely spaced wells instrumented with fibre optic cables for distributed acoustic sensing. Here we discuss the seismic monitoring program for Stage 3 and illustrate it with the results of a number of trials conducted on site while developing the program.
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MAXIMIZING SECONDARY OIL RECOVERY AND IMPROVING RETURNS BY OPTIMUM WELL PLACEMENT IN MATURE FIELDS
Authors S. Rajput, A. Khalil, N. Bt Mat Khair, Y. Sam, A. Roy and A. B. KhalidSummaryThis paper answers two important mature field re-development questions on secondary oil recovery. 1. How to maximize oil recovery? and 2. How to improve returns from mature assets? In this study, multi-disciplinary subsurface information was integrated to design four water injectors and five oil producers in a producing oil field for maximizing secondary oil recovery. A geostatistical inversion based algorithm was utilized to derive the lateral and vertical reservoir distribution and sets of equiprobable values of simulated rock properties generated. Joint geostatistical seismic Inversion (JGSI) driven Acoustic and Shear impedance (AI-SI) together with probability density functions from well logs were used to generate probability linking volumes for each reservoir. The key features that affect reservoir connectivity were identified by geostatistical inversion driven probability linking mechanism with reasonable accuracies, but with varying interpretations of fluid movement in the reservoir. Reservoir architecture was better understood with the integration of available geological information, well log interpretation and quantitative seismic derivatives. Waterflood impacted positively and the production has been increased from 25 – 40%. This added significant value to the project and the water injectors are self-sufficient in terms of cost recovery. Increased oil production improved the retunes on the asset.
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VALUE OF CORE TO SEISMIC SCALE DATA EARLY IN THE APPRAISAL PHASE, OFFSHORE SARAWAK
By J. AnthoaSummaryIn mid-2018, ConocoPhillips and its joint venture partner, PETRONAS Carigali drilled 2 E&A wells, Salam-2 and Patawali-1 well in Block WL4-00, Offshore Sarawak. The wells discovered oil and gas in multiple sands within the Late Miocene Cycle V interval.
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RESERVOIR CONNECTIVITY ANALYSIS BY INTEGRATING PROBABILISTIC DISTRIBUTION OF FLUIDS AND FACIES WITH STOCHASTIC INVERSION
Authors S. Rajput, M.A. B Abd Mutalib, R. Pathak, R. Adawiyah Bt M Ghozali, A. B Khalid, N. Nathesan and Y. SamSummaryOil, gas and water fluid in structurally complex channelized or faulted reservoirs can create complex reservoir plumbing relationships and reservoir connectivity can be mis understood, specially in water flood envireonment. Variable hydrocarbon contacts can develop when some, but not all, fluids are in pressure communication. Seismic based reservoir connectivity analysis is a series of steps to integrate structural complexity, stratigraphic units, and fluid pressure and composition data into permissible but non-unique scenarios of fluid contacts and pressures leveraged by seismic inversion derivatives. This new analytical approach has been used in a wide range of reservoirs including clastic and carbonates in the field around the world. The paper detailes an innovative workflow for reservoir connectivity analysis and highlights effective integration of probabilistic distribution of fluids and facies with stochastic inversion derivatives and static model. The results from infill drilling program were analyzed by integrating the geological models, 3D seismic, petrophysics, and reservoir engineering data to better understand the reservoir continuity. The study reveal that effective integration of this information with post drill data provide a more reliable and quantitative prediction of reservoir continuity and helps in designing the future drilling programs and optimizing water flood projects for improved oil recovery.
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ENHANCING DEEPWATER HYDROCARBON SEEPS HUNTING BY INTEGRATION OF SEISMIC, MULTIBEAM ECHO SOUNDING, AND GEOCHEMISTRY SURVEYS
Authors M. Mustaza, S.K. Tham, K. Norhasliza, K. Ruszaidi and R. M HelmiSummaryDeepwater hydrocarbon seeps hunting by multibeam echo sounding (MBES), high-resolution sub-bottom profiling, and geochemistry surveys de-risk tools for wildcat and new frontier explorations. The later are usually based upon seismic geophysical survey interpretation from which potential hydrocarbon prospects are mapped.
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SHALLOW-WATER OFFSHORE SABAH MALAYSIA REPROCESSING WITH HIGH-END IMAGING LEADING TO SIGNIFICANT IMAGING UPLIFT AND ENHANCED RESERVOIR UNDERSTANDING
Authors C. Wai Ling, G.M. Jones, N.A. Mohamad Radzi, M.A. Ismail, L.W. Long, S.F. Zohdi, K.K. Pillai, A. Sazykin, A. Waluyo, A. Muhamad, M. Ghazali and N. IsaSummaryReprocessing and reimaging legacy surveys can add significant value to existing seismic data sets while eliminating the requirement to acquire new data. During reprocessing work, an appropriate strategy must be set early on with the required technologies included in the processing flow to ensure that the desired uplift over the legacy seismic images is achieved. We present a case study of reprocessing and reimaging a legacy data set with the clear objective of enhancing the reservoir understanding. The broadband processed data, coupled with a tailored model building and depth imaging workflow, led to delivery of a clearer, more interpretable image, relative to the legacy processing. This image provided significant assistance and insight to the asset and interpretations teams in their evaluation of the field geology and reservoirs.
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UNLOCKING THIN OIL RIM RESERVOIRS IN EOR FIELD OFFSHORE MALAYSIA WITH INTEGRATED GEOSTEERING METHODS
SummaryThis paper will discuss the integrated process flow from planning until the execution of horizontal well in offshore Malaysia. The main challenge includes the present of extremely thin oil rim and the possibility of tilted fluid contacts. Discussion will cover the successful application of geosteering integrated with real-time data such as reservoir mapping tool, LWD and gas analysis data to ensure optimum horizontal well placement despite these challenges and has made the high-risk well successful and completed.
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A QUALITATIVE APPROACH FOR THIN BED RESERVOIR INTERPRETATION, A CASE STUDY IN AN ULTRA DEEPWATER FIELD, SABAH
More LessSummaryThe ultra-deep water Jewel field is situated in the southern corner of Block K, approximately 150 km Northwest of Labuan and in water depth of 1662m. Based on exploration and appraisal drilling, the field is observed to be highly compartmentalized with reservoirs being thin. In this ultra deep water setting, there is a heavy reliance on seismic data to help delineate the reservoir. The field Seismic data however has limitations where due to its low signal to noise ratio and the vertical resolution is deemed to be poor. As such, the thin beds prominent in Jewel field may not be fully resolved causing the thin hydrocarbon bearing reservoirs to go undetected. The presence of shallow gas accumulation can be a good indicator of a working petroleum system but these shallow gas in Jewel field masks the underlying seismic reservoir response as well as push down events causing time delay of the field structure.
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TARGETED VS. REGIONAL MODEL BUILDING AND IMAGING - A CASE STUDY FROM OFFSHORE SABAH, MALAYSIA
Authors D. Cavalin, Y.M. Wong, A. Bromley, M. Farouki and K. AgbebiSummaryMulti-Client (MC) surveys are typically large, regional in scope, and are intended to serve primarily for exploration purposes. Accordingly the velocity model building and imaging approach employed is designed to accommodate the regional geology across the entire survey area, and may therefore need to be customized to meet the requirements of specific exploration plays. For example, more detailed velocity analysis such as Full Waveform Inversion (FWI) together with imaging algorithms that can make use of the detail that is introduced in the velocity model, may be required for improved structural imaging of a particular prospect. In this regard it is important that the quality of the recorded seismic data and pre-processing flow supports the application of a targeted workflow which includes advanced modelling and imaging techniques. This case study compares the results of regional and targeted imaging approaches on a MC survey acquired in Block ND5, offshore Sabah, Malaysia.
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SEAMLESS INTEGRATION OF ACQUISITION, PROCESSING AND INTERPRETATION OF MULTI AZIMUTH STREAMER 4D ENABLING TIMELY IMPACT ON THE NEXT DEVELOPMENT PHASE OF A MALAYSIAN FIELD
Authors I. Rahman, G. Balakrishnan, L. Chee Kiong and A. TanSummaryThe key success indicator for time-lapse seismic begins at the acquisition stage in the aspect of positional repeatability of seismic sources and receivers. To achieve this, the first step in the survey planning is to understand the Base survey design, source-receiver positioning, feathering angle and ocean current direction and magnitude.
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