Wings, mushrooms, and Christmas trees: The carbonate seismic geomorphology of Central Luconia, Miocene–present, offshore Sarawak, northwest Borneo

Koša, Eduard; Warrlich, Georg; Loftus, Guy

doi:10.1306/06181514201

Cited by 42 publications

(8 citation statements)

References 33 publications

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“…Central Luconia is a gas-producing carbonate province offshore Sarawak formed by carbonate build-ups and influenced by terrestrial processes including erosion and fluvial deposition at exposed shelf during lowstands [20]. Terrestrial processes could lead to deposition of siliciclastic deposits which may act as thief bed migrating hydrocarbons away from carbonate reservoir [21].…”

Section: Figure 21mentioning

confidence: 99%

Implication of Reservoir Characteristics Based on Overview of Structure and Sedimentology of Outcrops Along Bintulu-Niah-Miri Areas

Cheng¹

2019

Malays. j. geosci.

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Six-day fieldwork was conducted in the northwest coast of Sarawak to examine the outcrops along Bintulu-Niah-Miri areas which cover southern part of Balingian Province and Baram Delta Province. The aim of this fieldwork is to synthesize the observations of structure and sedimentology of outcrops along Bintulu-Niah-Miri areas and discuss the implication of reservoir characteristics based on observation. The study was conducted by sketching the main structural elements of outcrops followed by detailed sedimentological analysis which include observation and facies description were conducted on different outcrops along Bintulu-Niah-Miri areas using sedimentary logs. The findings show that Bintulu-Niah-Miri areas outcrops consists of mixed-environment deposited succession with tidal and wave characteristic. This resulted in reservoir architect will be different and result in different in reservoir properties included horizontal and vertical permeability of fluids. Niah Cave is a good place to study the distribution of the types of breccia due to collapsed paleokarst at reservoir scale and also good analog for Central Luconia Platform where large resources of hydrocarbon have been discovered due to the its environment setting or forming process is same as Central Luconia Platform. In addition, Miri Airport Outcrop succession consist of Type 4-Fracture Create Flow Barriers which could lead to potential production problems.

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Section: Figure 21mentioning

confidence: 99%

Implication of Reservoir Characteristics Based on Overview of Structure and Sedimentology of Outcrops Along Bintulu-Niah-Miri Areas

Cheng¹

2019

Malays. j. geosci.

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“…These correspond to units with distinct porosity classes. Koša et al (2015) has stated that the TX Field is generally of low to moderate porosity, Zones 2 and 4 are porous layers whereas Zone 3 and upper Zone 5 are tight layers. Zone 3 is described as a separation unit of tight reservoir facies between the hydrocarbon reservoirs in Zone 2 and 4.…”

Section: Structural Setting Of Tx Fieldmentioning

confidence: 99%

Study of a TX field Miocene carbonate build-up: Integration of sedimentological data with modern carbonate analogue and 3D seismic characterization to establish carbonate facies modelling workflow

Ooi¹,

Pöppelreiter²,

Ghosh³

et al. 2018

BGSM

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Facies modelling of the Central Luconia carbonate build-up is a complex process due to the multi-scale heterogeneity of carbonate reservoirs in terms of facies, stratigraphy and pore structure variations. The objective of this paper is to integrate core, modern carbonate platform and 3D seismic data for building a conceptual model to establish a carbonate build-up facies modelling workflow. The first part of the workflow builds a conceptual geological model via the integration of core and modern carbonate build-up analogue data. The sedimentological study began by describing the core facies units of a field, which was then correlated to the well logs. Five reservoir zones comprising of a total thickness of approximately 323m are identified, with Zone 3 and upper Zone 5 the tighter zones when compared to Zones 1, 2 and 4. The subsequent study of modern analogue is conducted to infer the lateral distribution of various facies throughout the carbonate build-up. The second part of the research involves the characterization of 3D seismic of the build-up calibrated with core and modern analogue data. Seismic interpretation has distinguished six reservoir surfaces: Top of carbonate (ToC), TZ2, TZ3, TZ4, TZ5, and TZ6. Reservoir zones from core-to-well correlation is used for tying the well to 3D seismic, ensuring distinct correlations. In addition, seismic attributes are generated from 3D seismic to distinguish platform geometries and for seismic stratigraphy analysis. In summary, conceptual modelling is a crucial step in carbonate facies modelling workflow requiring extensive amount of time for iterating and refining, prior to conducting digital facies modelling.

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“…This can be seen even clearer when flattening on a horizon in the overburden to mimic the geometries at the time of deposition more closely (Figure 15). Kosa et al, 2015 labeled this type of platform slope as 'open wings': marginal carbonate facies prograding out from carbonate buildups, interfingering with siliclastic strata (Figure 17). Coarse, well-sorted grainstones are sampled in this interval, confirming the interpretation (Figure 16).…”

Section: Slope Deposits Of the Alpha Field And Their Impact On Flow Amentioning

confidence: 99%

Data Integration and Reservoir Characterization to Understand Water Movement during Production in a Mature Gas Field, Luconia Province, Malaysia

Chiew

Warrlich

Binda

et al. 2016

Day 3 Thu, March 24, 2016

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Interdisciplinary data integration is key to top-quartile Well Reservoir Field Management (WRFM). In our field case, results from annual well-intervention activities were analyzed and integrated with production data and the regional-to-reservoir scale geological understanding of this carbonate gas field to improve the delineation of the gas-water contact (GWC) development and allow timely water shut off (WSO) at the optimal depths in the reservoir, while at the same time utilizing reservoir heterogeneities (such as horizontal baffles) to delay water breakthrough (WBT).The carbonate gas field is located in Central Luconia, with over 30 years of production history. Some wells have seen significant WBT and the field experiences an uneven rise of the GWC with production. To improve the GWC prediction, reservoir characterization work was aimed to capture the key heterogeneities that matter for flow: baffles vs. high-permeability conduits to water movement. As such, geological characterization focused on low-porosity zone correlation and platform margin & slope deposit interpretation along the flanks of the field, respectively.In order to understand the baffling nature of rock facies to fluid flow, low porosity zones were mapped across the field initially on seismic and well logs. In core, two types of low-porosity layers were observed: flooding-and exposure-related low-porosity layers. Both types of low-porosity layers show similar log signatures, but behave very differently during production . Flooding-related low-porosity layers are extensive and composed of fine-grained, argillaceous material. They form baffles that are capable of delaying water rise for several years. Exposure-related low-porosity layers, on the other hand, are composed of cemented, brittle limestones and are often associated with karsts and fractures. Their baffling capacity is limited and can even act as high-permeability conduits speeding up the GWC rise, when connected to karst dissolution.Platform margin and depositional-slope deposits were observed on seismic in the flanks of the field. These are inclined beds of potentially permeable deposits that have been shed from the carbonate platform during sea-level highstands. Commonly the strongest progradation and best-developed slope deposits are located on the leeward side, i.e. platform-top shedding and transport in the main paleo-current direction.Due to their inclined nature, they dip directly into the water leg and thus can act as conduits for water during production.

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Wings, mushrooms, and Christmas trees: The carbonate seismic geomorphology of Central Luconia, Miocene–present, offshore Sarawak, northwest Borneo

Cited by 42 publications

References 33 publications

Implication of Reservoir Characteristics Based on Overview of Structure and Sedimentology of Outcrops Along Bintulu-Niah-Miri Areas

Implication of Reservoir Characteristics Based on Overview of Structure and Sedimentology of Outcrops Along Bintulu-Niah-Miri Areas

Study of a TX field Miocene carbonate build-up: Integration of sedimentological data with modern carbonate analogue and 3D seismic characterization to establish carbonate facies modelling workflow

Data Integration and Reservoir Characterization to Understand Water Movement during Production in a Mature Gas Field, Luconia Province, Malaysia

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