Depositional environment and reservoir quality of Miocene sediments in the central part of the Nam Con Son Basin, southern Vietnam shelf

Dung, Bui Viet; Tuấn, Hoàng Anh; Kieu, Nguyen Van; Man, Ha Quang; Thủy, Nguyễn Thị Thanh; Huyen, Pham Thi Dieu

doi:10.1016/j.marpetgeo.2018.05.004

Cited by 19 publications

(17 citation statements)

References 19 publications

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“…The Cuu Long and Nam Con Son basins are two NE-SW trending basins in offshore SE Vietnam that are separated by the Con Son Swell. The basins contain Late Eocene/Oligocene to Miocene sediments that were deposited in fluvial to marine environments, which have been documented by 2D/3D seismic, wireline logs, biostratigraphy, palynology, and core petrography (e.g., Nguyen and Nguyen 1995;Matthews et al 1997;Dien et al 1998;Lee et al 2001;Morley et al 2011Morley et al , 2019Dung et al 2018). These sediments were deposited above Mesozoic meta-sedimentary, metamorphic and igneous rocks that form the basement (e.g., Matthews et al 1997;Cuong and Warren 2009).…”

Section: Regional Backgroundmentioning

confidence: 99%

“…Rifting of the Nam Con Son Basin started at c. 32 Ma (Swiecicki and Maynard 2009), later than many other basins across the Sunda region, where an earlier Eocene rift phase is commonly identified (Morley et al 2011). Four principal megasequences based on tectonic stages of the Nam Con Son Basin have been identified and include syn-rift 1, interrift or post-rift 1, syn-rift 2 and post-rift 2 (Matthews et al 1997;Lee et al 2001;Morley et al 2011;Meyer 2012;Tuan and Tri 2016;Dung et al 2018). The megasequences are further subdivided into sequence stratigraphic third-order depositional sequences (T10 to Q100) that are correlated with lithostratigraphic units.…”

Section: Regional Backgroundmentioning

confidence: 99%

“…The megasequences are further subdivided into sequence stratigraphic third-order depositional sequences (T10 to Q100) that are correlated with lithostratigraphic units. The syn-rift 1 consists of sequence T10 deposited in the early Oligocene (Morley et al 2011), possibly ranging down into the Late Eocene (Matthews et al 1997;Dung et al 2018). Inter-rift consists of T20 and T30 associated with regional subsidence possible in response to opening of the South China Sea.…”

Section: Regional Backgroundmentioning

confidence: 99%

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Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

Breitfeld

Hennig-Breitfeld

BouDagher‐Fadel

et al. 2022

Int J Earth Sci (Geol Rundsch)

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The offshore Cuu Long (CLB) and Nam Con Son (NCSB) basins of SE Vietnam are two important Cenozoic hydrocarbon-bearing basins in the southern South China Sea (SCS), which can contribute to understanding the evolution of major SE Asian river systems, in particular the Mekong River. The Oligocene to Early Miocene basin fill of the Cuu Long Basin is dominated by sediment sourced locally from the Da Lat Zone basement on land. Sandstones have abundant Cretaceous detrital zircons and heavy mineral assemblages dominated by apatite and epidote. The Bach Ho Unconformity at c. 16 to 20.5 Ma marks a major provenance change and the overlying Middle to Late Miocene Con Son and Dong Nai formations were sourced by a large river system, which drained Indochina or even the Himalaya, resembling the present-day Mekong River. These formations have heterogeneous detrital zircon populations dominated by Triassic ages and zircon–rutile–tourmaline-dominated heavy mineral assemblages. The Oligocene Cau and Early Miocene Dua formations of the Nam Con Son Basin have a similar provenance to the CLB Con Son and Dong Nai formations, indicating a comparable drainage history of a large proto-Chao Phraya. At the Dua Unconformity at c. 15.4 to 17 Ma the Indochina provenance signature changes to a predominant Sibumasu signature.The early Mekong River evolution is suggested to have involved two river systems. A proto-Mekong 1 initially filled the CLB, while at the same time a proto-Chao Phraya River with a capture area into the Himalaya filled the Malay Basin and/or the NCSB. At the end of the Early Miocene drainage was completely reorganised, and the proto-Mekong 1 captured the headwaters of the proto-Chao Phraya and became the proto-Mekong 2, while the NCSB was filled by sediment from the Malay–Thai Peninsula. This major change marks a very important drainage reorganisation in the southern SCS region.

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Section: Regional Backgroundmentioning

confidence: 99%

Section: Regional Backgroundmentioning

confidence: 99%

Section: Regional Backgroundmentioning

confidence: 99%

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Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

Breitfeld

Hennig-Breitfeld

BouDagher‐Fadel

et al. 2022

Int J Earth Sci (Geol Rundsch)

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“…The post rift section during the late Miocene is marked by thermal sag and the deposition of the Mekong Delta sediments into the NCSB. This resulted in thermal maturation of the deeper section [26,27].…”

Section: Geological Settingmentioning

confidence: 99%

Hydraulic Flow Unit Classification and Prediction Using Machine Learning Techniques: A Case Study from the Nam Con Son Basin, Offshore Vietnam

Man¹,

Hien²,

Thong

et al. 2021

Energies

Self Cite

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The test study area is the Miocene reservoir of Nam Con Son Basin, offshore Vietnam. In the study we used unsupervised learning to automatically cluster hydraulic flow units (HU) based on flow zone indicators (FZI) in a core plug dataset. Then we applied supervised learning to predict HU by combining core and well log data. We tested several machine learning algorithms. In the first phase, we derived hydraulic flow unit clustering of porosity and permeability of core data using unsupervised machine learning methods such as Ward’s, K mean, Self-Organize Map (SOM) and Fuzzy C mean (FCM). Then we applied supervised machine learning methods including Artificial Neural Networks (ANN), Support Vector Machines (SVM), Boosted Tree (BT) and Random Forest (RF). We combined both core and log data to predict HU logs for the full well section of the wells without core data. We used four wells with six logs (GR, DT, NPHI, LLD, LSS and RHOB) and 578 cores from the Miocene reservoir to train, validate and test the data. Our goal was to show that the correct combination of cores and well logs data would provide reservoir engineers with a tool for HU classification and estimation of permeability in a continuous geological profile. Our research showed that machine learning effectively boosts the prediction of permeability, reduces uncertainty in reservoir modeling, and improves project economics.

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“…extension associated with SCS extension, even though active spreading to the east has ceased (Matthews et al, 1997;Fyhn et al, 2009a, b;Dung et al, 2018). Volcanic eruptions there appear to have been emplaced along fault planes, suggesting rifting predates volcanic activity (Fyhn et al, 2009 a, b), but it is not clear if this pattern continues onshore, where the major tectonic regime during the Pliocene-Holocene is thought to be thermal subsidence (Tri et al, 2011).…”

Section: Geologic Settingmentioning

confidence: 99%

Neogene-Recent Reactivation of Jurassic-age Faults in Southern Vietnam, with Implications for the Extrusion of Indochina

Burberry¹,

Elkins²,

Hoang³

et al. 2019

Preprint

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Onshore Vietnam contains a complex series of faults coupled with a diffuse igneous province that has been active since the mid-Miocene. However, there are several conflicting fault maps in the literature and no consensus concerning the relative age of mapped faults and Neogene basalt flows, which becomes problematic when trying to use structural data to distinguish between competing tectonic models for the SE Asia region. This paper aims to define the Neogene-Recent tectonic setting and kinematics of the Da Lat block of the onshore Vietnam region, by analyzing the orientation, kinematics and ages of faults across a sub-region of the block. Fault ages can be constrained by the cross-cutting relationships with dated basalt flows. Results from remote sensing show a strong NE-SW fault trend for southern Vietnam, with additional, minor N-S, E-W and NW-SE trends. Fault orientations observed in the field fall into this NE-SW trending class, and are sub-vertical. In the basalt flows (with eruption ages < 5 Ma) these faults have oblique lineations with a strong strike-slip component. In Jurassic sediments, these faults show two sets of lineations: an older, dip-slip set, and a younger, oblique-slip set. We postulate that Jurassic-age dip-slip faults have been reactivated as strike-slip faults post 5 Ma. Strike-slip motion on NE-SW oriented faults is consistent with rotation and extrusion of the Kontum and Da Lat blocks. Rotation of the blocks is consistent with continuum rubble behavior of small crustal blocks under the influence of extrusion-driven asthenospheric flow.

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Depositional environment and reservoir quality of Miocene sediments in the central part of the Nam Con Son Basin, southern Vietnam shelf

Cited by 19 publications

References 19 publications

Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

Provenance of Oligocene–Miocene sedimentary rocks in the Cuu Long and Nam Con Son basins, Vietnam and early history of the Mekong River

Hydraulic Flow Unit Classification and Prediction Using Machine Learning Techniques: A Case Study from the Nam Con Son Basin, Offshore Vietnam

Neogene-Recent Reactivation of Jurassic-age Faults in Southern Vietnam, with Implications for the Extrusion of Indochina

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