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APGCE 2019
- Conference date: October 29-30, 2019
- Location: Kuala Lumpur, Malaysia
- Published: 29 October 2019
81 - 99 of 99 results
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REGIONAL AND LOCAL STRESS ANALYSIS USING BOREHOLE IMAGE INTERPRETATION - INSIGHT FROM SOUTH SUMATERA
Authors M.Z. Mohd Nasir and M.H. MohamadSummarySouth Sumatra Basin is one of the mature basin in Sumatra, Indonesia. Exploration started in South Sumatra Basin as early as 1886 by discovery of Kampung Minyak Field (Macgregor, 1995). Since then, numerous exploration and production activities have been done for both conventional and unconventional plays. The Basement play had become significant play with major gas discovery in the Corridor PSC and these fields have been produce since 2001 until now. Understanding the natural fracture networks is crucial to determine the reservoir effectiveness for the hydrocarbon production from fractured basement formation. The uncertainty and main risk dealing with basement reservoir which fractures and fault contribute to open or conductive fractures. Thus, determining which fracture open is crucial. In-situ stress regime plays the important role to recognize the effective porosity and permeability of fractured basement. Several studies on the tectonic and stress field have been conducted (e.g. Mount and Suppe, 1992; Tingay et al, 2010 ) which largely focused on present-day stress orientation from well data. It is due to inability to map the small faults and fractures using seismic data. Using well data, critical stress and maximum horizontal stress can be determined from the conductive fractures and borehole breakout respectively.
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PUSHING THE BOUNDARIES OF SHALLOW WATER, LIMITED OFFSET DATA USING ADVANCED IMAGING METHODS FOR PRE-CARBONATE IMAGING
Authors A. Latib H, S. Zainal, H. Tan J, K. Syah M, S. Maitra, H. Lim C, W. Hoong T, A. Bapu M and D. Woei ASummaryOne of the preferred cost-effective solutions when searching for deeper, pre-carbonate targets in a marginal field is by reprocessing of a vintage seismic dataset using the most current state-of-the-art processing technology. The vintage data in our study area suffered from amplitude loss due to seismic signal absorption and distortion by complex multi-layer high absorption pre-carbonates and gas clouds, causing discontinuous deep seismic reflectors at the target zone. Careful noise and multiple elimination around the carbonate layers was critical for proper imaging of deeper fault systems. Despite the limited offset and narrow azimuth data, current advanced imaging technologies managed to reveal the reservoir.
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CENTRAL LUCONIA CARBONATE RESERVOIR SWEET SPOT IDENTIFICATION OF LANG LEBAH-1(RDL2)
SummarySarawak exploration’s creaming curve, mainly dominated by dry natural gas, is still rising from recent discoveries in the Late Miocene platform carbonates and pinnacle reefs of Central Luconia sub-basin. The geological province of Central Luconia extends over 40,000 sq.km with more than 200 carbonate build-ups ( Longman, 1993 ), which grew on regional and local highs of deep graben structure. PTTEP acquired exploration block namely SK410B in 2016, and completed 3D broadband seismic acquisition in 2017. In order to successfully explore remaining hydrocarbon potential in a mature basin, comprehensive exploration approach for well targeting in carbonate reef is established. The approach requires integration of comprehensive result of reservoir characterization using seismic quantitative interpretation (rock physics and seismic inversion), and carbonate growth architecture identification. The multidisciplinary approach then referred to the sweet-spot targeting for carbonate build-up appraisal program.
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OVERCOMING CHALLENGES OF CONVERTED WAVE IMAGING IN THE PRESENCE OF STRONGLY ANISOTROPIC, HETEROGENEOUS MEDIA
Authors F. Basir F, S. Maitra, G. Wang, S. Zainal, L. Ghazali M and R. Ghazali ASummaryConverted wave imaging has been proven to be able to provide a complementary subsurface image to conventional P-wave imaging. This dataset from offshore Sarawak, Malaysia, suffers from strong gas absorption effects on the P-wave image because of which 4C OBN data was recorded. Due to the wide azimuth nature of the OBN data it was apparent that the area also experiences strong azimuthal anisotropy due to a compressional stress field in the region. PS imaging suffers greatly under these geological and structural complexities and requires careful handling. This paper describes pre-processing and imaging efforts to mitigate illumination, azimuthal and velocity modelling challenges and produce a high quality PS image.
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PRE-SALT IMAGING ADVANCEMENT AND CAPTURING UNCERTAINTY OVER RESOURCE ASSESSMENT
Authors W.C. Low, M. Mohd Nor, G. Coskun and J. IsmailSummaryStatistical analysis comparison has been carried out based on the mapped depth of the structural crest, structural spill, structural area and gross rock volume of 25 structures, across the basins of various geological domains and different seismic vintages.
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PORE PRESSURE PREDICTION BASED 3D TOMOGRAPHIC INVERSION VELOCITY MODELING FOR LANG LEBAH-1(RDL2)
SummaryOne of the main operation challenges exploring carbonate reservoir in Central Luconia is the high pressure environment. Therefore, pore pressure prediction is one of the most important inputs required for more efficient casing design, accurate mud-weight estimation, and safe operation preparation for each reservoir section.
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OLIGOCENE TO RECENT STRUCTURAL EVOLUTION OF NORTH SUMATRA BASIN
Authors M. Muchlis and C. EldersSummaryFaults that formed the basin boundary fault were created during extensional evens in the Oligocene. During the late Miocene the NSB experienced compression where fold structures were formed. In addition some extensional faults were also reactivated at this time which caused the formation of inversion structures. By contrast, interpretation of offshore 2D seismic lines shows that the major faults (the basin bounding fault system) are oriented north-south. These faults are also Oligocene in age and are controlled by extensional events. Fold structures formed during the late Miocene and younger. However, there is also fold structure that formed during the Oligocene in the western part of the offshore. During late Miocene-early Neogene the offshore North Sumatra Basin also experienced minor faulting that is expressed by small normal faults.
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CLUSTER DEVELOPMENT CONCEPT: NEW APPROACH FOR MALAYSIA MARGINAL FIELDS
Authors S. Pernsantia, P. Siriyoot, A. Suphawajruksakul and S. ThanudamrongSummaryRegarding various types of the studies such as the depositional environment from sequence stratigraphy study, fault seal analysis, structural analysis and amplitude attribute study, they indicate the dependency of each compartment. As this, PTTEP integrates all results of the studies to build the concept to support cluster development model and with this concept, it will enable PTTEP to develop many marginal fields.
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UNDERSTAND THE CARBONATE HETEROGENEITY TO EFFECTIVELY EXPLORATION AND DEVELOP CARBONATE PLAYS IN SOUTHEAST ASIA
By F. XueSummaryCarbonate heterogeneity is extreme and extensive and has significant impact in carbonate exploration and production. But due to limited knowledge and approaches on carbonate heterogeneity, carbonate E&P operations are much under-performed, which have left large potential unrecognized in carbonates for exploration and development, even in many mature fields/areas. Based on carbonate characters, the opportunities in carbonate E&P at Southeast Asia are grouped into four types for discussion.
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BORNEO ALTERNATIVE MODEL - BORNEO INDENTION (PART 1 SABAH)
More LessSummaryAn Alternative Model for Sabah NE Borneo Tectonic is proposed, namely Borneo Indention. The model propose significant tectonic stress originated from collision of Pacific and Australia Plate, resulted into indentation tectonic observed on onshore and offshore NE Borneo.
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MULTI-COMPONENT STREAMER DESIGN; CURRENT STATUS AND THE WAY FORWARD
Authors N. Goujon, S. Rentsch, L. Combee, F. Guizelin and K.F. AhmadSummaryThe design of towed streamers has been optimized over the years to deliver high-quality pressure data from hydrophones. More recently, new multicomponent towed streamers have been introduced to the market, where particle motion is measured in addition to the pressure. Because particle motion sensors directly measure the vibration modes generated in a cable under tow, this introduces new constraints on the design of towed streamers. To study the impact of the streamer mechanical construction on the characteristics of the vibration noise, we have built streamer sections with dense point receiver sampling, identical electronic backbone and MEMS sensors, but different mechanical properties. We towed them together under different tensions in a fjord experiment. We observed that, as expected, the transverse vibration noise was the dominant noise mode, with dispersion characteristics depending on the streamer bending stiffness. We also found that the noise amplitude and maximum frequency depends on the mechanical properties of the cable, and that they could be reduced by using a new type of gel optimized to dampen vibration. Based on these findings, we see an opportunity to design a cost-efficient multicomponent streamer combining an optimized mechanical platform with a new single sensor configuration.
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THE DIGITAL GEOSCIENCE REVOLUTION – WHERE ARE WE NOW?
Authors S.J. Buckley, N. Naumann, K. Ringdal, B. Tong, J. Vanbiervliet, M. Chmielewska, G. Maxwell and J.A. HowellSummaryThis abstract will cover the latest developments in digital outcrop modelling, showing how the convergence of disciplines and advances in technology are allowing us to realise the early potential shown in the early 2000s with the advent of lidar. The contribution will show how geoscientists are adopting digital outcrop methods in unprecedented numbers, and that challenges are still evident that should be addressed. We will illustrate the topic with three showcase examples: combining digital outcrop modelling with seismic modelling, the SAFARI outcrop analogue database, and preparing virtual field trips by combining many geoscience data sources.
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G-FIELD – A NEW WAY FOR IWRS IN BROWN FIELDS: REDRILLS
Authors F.J. Heng, A.F. Mohamed Isa, C. Chew, C.Y. Chiu and S. HamzahSummaryThe paper demonstrated an alternative way of developing a mature field at a cheaper cost, and improved production rates
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3D SEISMIC INTERPRETATION AND MAPPING OF THE UPPER MIOCENE – LOWER PLIOCENE KELIDANG FAN, DEEP WATER OFFSHORE BRUNEI: A NEW PLAY ILLUMINATED THROUGH INTEGRATION OF SEISMIC ATTRIBUTE AND GEOLOGY
Authors N.A. A Ghafar, C.W. Rudiana, S. Chee At Saad, M.A. Hj Ismail and M.I. Megat IsmailSummarySubsurface of ultra-deep water Brunei Darussalam has remained untouched since the petroleum exploration began in the country. The ultra-deep water area, which is to be discussed in this paper, was considerably a frontier area with major risks was on reservoir presence and hydrocarbon charging. Reservoir remained the major risk until the Late Miocene-Early Pliocene sand rich turbidite fan namely the Kelidang fan was discovered. The area, in which Kelidang fan is located, has been receiving sediments mainly from two delta systems namely the Champion delta and Baram Delta. However, this extended abstract mainly focusses on the sequence that was sourced by the Baram Delta. From the 3D seismic interpretation, it shows that the Kelidang fan extends some 60km into outboard offshore Brunei and has been transported via narrow deepwater channel systems linked to the 5.3Ma paleo-shelfal canyons at the edge of Baram delta. Interpretation and analyses on technical data shows that the paleo-settings and structuration of continental shelf, slope, basin floor and massive deposition of mass transport complexes played roles in defining the delivery system of the Kelidang fan.
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IMPROVING OLD SEISMIC USING FULL WAVEFIELD INVERSION AND BROADBAND PROCESSING: IMAGING COMPLEX STRUCTURES UNDER SHALLOW GAS
Authors G. Chen, V. Gudipati, S. Jaynes, T. Jenkinson, S. Lee, J. Reilly, S. Lazaratos, R. Neelamani, A. Martinez, A. Zulfitri, F. Onn, C. Shaw, A.R. Ghazali, A.A. A. Khalil and N.H. NghiSummaryA case study is presented wherein broadband processing, FWI and Q migration have been used to address poor imaging due to complex-overburden and amplitude-loss. The area of study is a producing oil field in offshore Malaysia, where seismic imaging was impacted by extensive shallow gas accumulations. OBC and streamer data were used to produce high-resolution subsurface velocity models via FWI. Our results show that modern processing methods combined with FWI can provide significant imaging uplift and reduce interpretation uncertainty, even with seismic data that are decades-old.
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SPARSE CL-SRME USING IMPULSE RESPONSE AND SOURCE WAVELET: METHOD AND APPLICATIONS
Authors H. Hashim, A.R. Arshad and A.H. Abdul LatiffSummaryWe proposed a new approach for multiple removal using the CL-SRME method. Instead of directly updating the estimated primaries, we update the impulse response and the source wavelet together during inversion as both are used to defined the primaries estimate. Through imposing the sparsity constraint toward the update of the primary impulse, we can obtained the spiky primary impulse and reduce the time for its convergence. With an example from both synthetic and field data of Malay Basin, it shows that this new approach works on both shallow and complex geological area. One advantage of using the new approach is it were able to recover the primaries continuity which are often missing due to primaries-multiples overlap. The faster rate of convergence also proves that this new approach could be an alternative to EPSI or CL-SRME.
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EVOLUTION OF LATE QUATERNARY SARAWAK SHELF: A SEISMIC GEOMORPHOLOGIC APPROACH
Authors S. Nayak, N. Pendkar, S.F. Jabbar and A.J. Che JohariSummaryThis paper presents results using the extensive 3D seismic data from Sarawak offshore to characterize geomorphic features and understand changes in depositional environment using shallow seismic data within 500 ms from sea bed. Well-developed fluvial channels and incised valleys identified in seismic time-slices represent exposure of Sarawak Shelf during later Quaternary time. The current study also identifies prominent fluvial river systems throughout Sarawak shelf using 3D seismic data. Presence of numerous rivers of different shapes and sizes points to exposure of Sarawak shelf during sea level fall during Late Quaternary age. Some of the river valleys could be traced for more than 200 km. Presence of large scale incised valleys with prominent tidal inlets refers to sea level lowering below shelf edge exposing the whole shelf. Few consecutive time slices from a survey have been presented to demonstrate dynamic changes of depositional elements because of sea level variations throughout Sarawak shelf. Geomorphic features mapped and the broad EOD patterns recognized in the study can be used to understand sediment dispersal pattern in a coastal plain environment. These features could be used as analogue to the deeper hydrocarbon bearing Cycle I reservoirs of Sarawak basin, which were deposited in similar coastal plain environment.
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MINIMIZING DEPTH UNCERTAINTIES BELOW GAS CLOUD: TIME-TO-DEPTH CONVERSION TECHNIQUE
Authors A.G. Mohd Adnan, U.F. Ungku Farid, M.A. M Ishak and A. AzmiSummaryThis paper presents a new way to address one of the current challenge problems in geoscience within Malaysia; namely, Shallow gas effect for hydrocarbon exploration in Malaysia. The presence of shallow gas in the overburden can distort and negatively impact the seismic image quality underneath the gas affected area. These images below clouds are usually not properly imaged due to the complex wave propagation through the gas body, for instance, dispersion, scattering, internal multiples, mode conversion during wave propagation, and possibly anelastic losses. This method takes into consideration both seismic velocity and wells, and it takes into consideration both seismic velocity and wells, provided that there are wells penetrating the gas clouds. For best results when dealing with structural and geological complexities, PSDM with wells will provide the ideal depth conversion results
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SUBTLE INFORMATION THAT BRINGS VALUE: GEOLOGICAL BARRIERS REVEALED THROUGH DATA INTEGRATION
Authors C.L. Lai, C.M. Pang, F. Fahmi and R. Abdul RazakSummaryThe B reservoir was initially interpreted as a meandering channel system, observed on seismic data. Subsequently, wells were drilled to further appraise and produce the reserves from this reservoir. However, after several years of production, reservoir simulation history matching suggests that the reservoir production does not behave like a single tank. Pressure transient analysis suggests that there exists a partial barrier that isolates the production around Well-21. Reservoir engineering studies have also inferred the locations of potential barriers, a certain distance from Well-21. Further analysis are then performed on the seismic dataset to identify these potential barriers that would explain the production history. In this example, the application of spectral decomposition managed to identify several channel features that is cutting across the main reservoir. After several iterations of reservoir model updates, some of these potential barrier features are in locations that are consistent with reservoir engineering analysis. The reservoir models have since been updated and new infill well locations were identified, further maximizing the value of the B reservoir.
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