Outcrop Analogues for Subsurface Sand Body Geometries in Regressive and Transgressive Mahakam Delta Successions

Riadi, Ridha S.; Lambiase, Joseph J.

doi:10.29118/ipa.0.15.g.100

Cited by 2 publications

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“…The research area contains several oil and gas fields, where a combination of structure and stratigraphy is the dominant trapping mechanism. The study area is located in the Sanga-Sanga block of East Kalimantan and is mostly dominated by deltaicsediments of the Miocene age [42,45]. The structural setting of the studied region comprises double plunging anticlines and synclines bounded by thrust faults to the west and the east (Figure 2).…”

Section: Geological Settingmentioning

confidence: 99%

Sedimentary Environments and Paleoclimate Control of the Middle Miocene Balikpapan Group, Lower Kutai Basin (Indonesia): Implications for Evaluation of the Hydrocarbon Potential

Jamaluddin,

Wagreich,

Gier

et al. 2023

Minerals

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Sedimentary organic matter concentrated in source rocks forms the main source for the formation of hydrocarbons. Its deposition and preservation are strongly controlled by the depositional environment and paleoclimate. This study evaluates the paleoenvironment and the paleoclimatic controls of sediments in the Middle Miocene Balikpapan Group, Mahakam Delta of the Lower Kutai Basin, Indonesia. The sedimentary succession of the Mentawir Formation, encountered in three wells (MHK 1, MHK 3, and MHK 4), contains interbedded sandstones, siltstones, shales, and coal. Gamma ray log analysis has revealed four facies associations: (a) funnel-, (b) bell-, (c) cylindrical-, and (d) bow-shaped patterns, which, together with sedimentological and mineralogical analysis, suggest a fluvio-deltaic depositional environment during the Middle Miocene in the study area. Sedimentary successions from wells MHK 1 and MHK 3 comprise interbedded sandstone and siltstones and are interpreted to represent repeatedly occurring delta plain, delta front, and prodelta deposits. The succession encountered in well MHK 4 mostly consists of amalgamated sandstones and indicates a predominantly fluvial to upper delta plain environment with distributary channels and crevasse splays interbedded with only thin delta front deposits. X-ray diffraction–clay fraction analysis shows that the <2 μm clay-sized fraction consists of kaolinite (38%–67%), illite (14%–29%), chlorite (2%–17%), and mixed-layer illite/smectite (I/S) (14%–30%). Kaolinite formation and abundance indicates a hinterland climate classified as type Af (tropical rainforest) and intensive chemical weathering conditions in the source areas related to tropical to sub-tropical climates with high precipitation. Under such climatic conditions, kaolinite and I/S mixed-layer minerals are preferentially formed because the characteristic ions, K+, Na+, Ca2+, and Fe2+, are leached away. Thus, the production, transport, distribution, and preservation of sedimentary organic matter in the onshore Mentawir Formation of the Balikpapan Group are predominantly controlled by the humid tropical climate and fluvio-deltaic processes.

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Section: Geological Settingmentioning

confidence: 99%

Sedimentary Environments and Paleoclimate Control of the Middle Miocene Balikpapan Group, Lower Kutai Basin (Indonesia): Implications for Evaluation of the Hydrocarbon Potential

Jamaluddin,

Wagreich,

Gier

et al. 2023

Minerals

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“…In recent years, a number of studies have pointed out the importance of modern analogues as an additional tool to better interpret shoreface deposits in the region (e.g., Lambiase & Tulot, 2013). Using these helped consistently field geologists in giving better interpretations of sedimentary successions (Riadi & Lambiase, 2015;Liu et al, 2016) and perhaps, petroleum geologists in their difficult task to tackle down reservoir properties, but confidentiality issues often do not allow sharing their experience.…”

Section: Introductionmentioning

confidence: 99%

Sedimentological Characterisation Of Sea Bottom Samples Collected Offshore Muara And Tutong, Brunei Darussalam

Zaini¹,

Briguglio²,

Goeting³

et al. 2020

BGSM

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The study aims to get some additional knowledge on the modern seafloor composition offshore Brunei Darussalam by looking at the recent stratigraphic succession of the deposited sediments and their distribution patterns. For this reason, 10 shallow cores (22 to 46 cm thick) have been collected by scuba diving along two depth transects spanning from water depth of 20 to 60 m. One of the transects has been sampled north-northwest of the Muara village, just in front of the Brunei Bay and the other one off the coast near Tutong town, away from major sedimentary inputs. The results obtained portray two different sea bottom compositions and two different depth-related sediment distributions. The Muara transect is highly rich in mud and yielded abundant biogenic component at all investigated depths. The Tutong transect has a higher sand content but display constant changes along with depth. The sediment is mostly composed by biogenic grains such as rests of sponges, foraminifera, molluscs and echinoderms; the not biogenic grains are for the vast majority made of quartz. The sandy fractions of both transects have been tested for cyclicity and all cores can be described by functions with comparable periods, thus indicating that an oscillatory environmental event such as the alternation of the monsoon seasons, has similar influence on the seafloor of both transects.

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Outcrop Analogues for Subsurface Sand Body Geometries in Regressive and Transgressive Mahakam Delta Successions

Cited by 2 publications

References 0 publications

Sedimentary Environments and Paleoclimate Control of the Middle Miocene Balikpapan Group, Lower Kutai Basin (Indonesia): Implications for Evaluation of the Hydrocarbon Potential

Sedimentary Environments and Paleoclimate Control of the Middle Miocene Balikpapan Group, Lower Kutai Basin (Indonesia): Implications for Evaluation of the Hydrocarbon Potential

Sedimentological Characterisation Of Sea Bottom Samples Collected Offshore Muara And Tutong, Brunei Darussalam

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