Thomas J.H. Dodd

Thomas J.H. Dodd
British Geological Survey · Decarbonisation and Resource Management

Characterizing deep-lacustrine fans systems

About

62
Publications
31,683
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157
Citations
Citations since 2016
59 Research Items
155 Citations
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201620172018201920202021202201020304050
201620172018201920202021202201020304050
Introduction
Sedimentary geologist, seismic interpreter and stratigrapher for the British Geological Survey. Research interests include: deep-lacustrine sedimentary systems (subaqueous sediment gravity flow deposits); shallow-marine and fluvial deposits; characterisation of heterogeneities in reservoir intervals (seismic vs. sub-seismic-scale); regional geology of Singapore and Peninsular Malaysia, and more widely SE Asia.
Additional affiliations
September 2021 - present
British Geological Survey
Position
  • Consultant
October 2020 - present
Journal of Asian Earth Sciences:X
Position
  • Editor
April 2017 - present
British Geological Survey
Position
  • Petroleum and Sedimentary Geologist
Education
September 2018 - September 2026
Keele University
Field of study
  • Sedimentology (part time)
September 2007 - August 2011
Keele University
Field of study
  • Geology with Physical Geography

Publications

Publications (62)
Article
Full-text available
This paper presents a model of facies distribution within a set of early Cretaceous, deep‐lacustrine, partially confined turbidite fans (Sea Lion Fan, Sea Lion North Fan and Otter Fan) in the North Falkland Basin, South Atlantic. As a whole, ancient deep‐lacustrine turbidite systems are under‐represented in the literature when compared with those d...
Article
Full-text available
This paper details and describes a suite of 143 sub-seismic-scale clastic injectites encountered within the early Cretaceous, early post-rift of the deep-lacustrine North Falkland Basin. The injectites, referred to here as the Sea Lion Injectite System (SLIS), are encountered below, above and in-between the hydrocarbon-bearing, deep-lacustrine turb...
Article
Full-text available
The Middle Triassic Pulau Ayer Chawan Formation is a predominantly deep-marine, occasionally shallow-marine sedimentary succession, deposited in the Singapore sector of the Palaeo-Tethyan Semantan Basin. The formation provides an important record of the dynamic interplay between a siliciclastic sedimentary system and the products of an adjacent act...
Article
Full-text available
Hybrid event beds are texturally and compositionally-diverse deposits preserved within deepwater settings. They are deposited by flows exhibiting ‘mixed behaviour’, forming complex successions of sandstone and mudstone, which are often challenging to predict. Hybrid event beds are documented in deep-marine settings, where they have been thoroughly...
Article
Full-text available
A new lithostratigraphical framework for Singapore is proposed, based on the analysis of c. 20,000 m of core recovered from 121 c. 205 m deep boreholes and augmented with 218 field localities from across Singapore. The new framework describes a succession dating from the Carboniferous to the Quaternary. New U-Pb detrital zircon dates and fossil ana...
Article
This study introduces an integrated evaluation of geological and geophysical data, including sedimentology, diagenetic alteration, image log analysis, core measurements, formation evaluation, and a neural analysis technique (K-mode algorithm) to characterize the upper Messinian heterogeneous reservoirs of the Salma Field, Nile Delta, Egypt. It link...
Article
Full-text available
Formation porosity is a key factor that exerts substantial control upon reserve estimates, and ultimately may affect the development viability of unconventional resources. Microporosity studies have largely focused on siliciclastic mudstones, with limited examples that assess porosity type and distribution in organic-rich calcareous mudstone succes...
Conference Paper
Full-text available
Fault relay ramps serve as sediment delivery points along rift margins and often provide persistent flow p athways in deepwater sedimentary basins. Relay ramps first form as tilted rock volumes between en-eche lon fault segments. Through progressive deformation the tilted rock volume becomes faulted and fracture d. Eventually, a through-going fault...
Conference Paper
Full-text available
Hybrid event beds (HEBs) are texturally and compositionally-diverse deposits formed by flows exhibiting 'mixed behaviour'. These flow types typically form complex successions of sandstone and mudstone in the subsurface. HEBs tend to be clay-rich and are well-known for their ability to reduce reservoir quality/hydrocarbon pore-volume, as well as act...
Conference Paper
Full-text available
Understanding the flow processes that form gravity-flow deposits is vital for modeling and predicting sandstone bodies in the subsurface, which is of great significance for conventional and unconventional oil and gas exploration and development in lacustrine basins. This study analyses gravity-flow deposits in the Late Triassic Chang 7 member of Ya...
Article
Full-text available
Geological processes alter pore spaces over time, and their analysis can shed light on the dynamic fractal structure and fluid flow of rocks over time. This study presents experimental evidence to illustrate that the pore fractal structure evolves with sedimentation, carbonate cementation, clay growth, and dissolution. It examines, describes and ch...
Article
Full-text available
Fault relay ramps are important sediment delivery points along rift margins and often provide persistent flow pathways in deepwater sedimentary basins. They form as tilted rock volumes between en-echelon fault segments, which become modified through progressive deformation, and may develop through-going faults that ‘breach’ the relay ramp. It is we...
Article
Full-text available
This study presents a detailed synopsis of the sedimentological and structural features displayed within an underdescribed enigmatic facies observed in the basal Lower Jurassic Kayenta Formation of the Colorado Plateau. The facies comprises pebble to cobble-sized clasts of fine to medium-grained crossbedded sandstone with mud-draped and deformed fo...
Book
The first formal publication on the geology of Singapore was released in 1976 by the Public Works Department, with an updated version published in 2009 by the Defence Science and Technology Agency (DSTA). This memoir presents a comprehensive revision of the geology of Singapore based largely on information obtained from new borehole cores. Work be...
Book
The first formal publication on the geology of Singapore was released in 1976 by the Public Works Department, with an updated version published in 2009 by the Defence Science and Technology Agency (DSTA). That volume, which consists of a report and accompanying geological maps, became the prime reference for information relating to the geology of S...
Conference Paper
Full-text available
Deep-lacustrine settings represent a complex sedimentary environment, particularly when compared with their deep-marine counterparts. Their size, geometry, variable fluid-fill and autogenic controls (e.g. tectonic and climatic) make deep-lacustrine basins, and their internal sedimentary systems, unique and interesting environments. In contrast, dee...
Conference Paper
Full-text available
The depositional environments in the Early Jurassic are relatively poorly understood West of Shetland. Key lithostratigraphical units in this area include the lowermost Stack Skerry and overlying Sule Skerry formations of the Skerry Group (Lower Jurassic). Previous work loosely defined a 'shallow marine, inner shelf setting' for the Stack Skerry Fo...
Article
Full-text available
Understanding the flow processes that form gravity flow deposits is vital for modelling and prediction of sandstone bodies in the subsurface, which is of great significance for conventional and unconventional oil and gas exploration and development. This study analyses gravity flow deposits in the Late Triassic Chang 7 member of Yanchang Formation...
Conference Paper
Full-text available
Ancient deep-lacustrine fan systems and their internal lobes form as complex heterogeneous sedimentary successions in the subsurface. Subaqueous sediment gravity flows are responsible for transporting much of the coarse-grained material into these settings, depositing excellent-quality reservoir lithologies within otherwise mud-prone deep-lacustrin...
Conference Paper
Full-text available
Lacustrine basins and deep-lacustrine sedimentary environments are becoming more widely recognised as globally significant systems. Their size, geometry and varying fluid-fill compared to marine basins (fresh vs. saline water), make deep-lacustrine environments unique, intriguing and potentially contrasting sedimentary systems. While deep-marine sy...
Conference Paper
Full-text available
Fault structures at rift margins are important points of sediment input to basins; with sedimentation directed across bounding faults during the syn-rift, and diverted along relay ramps during the early post-rift. These deposits can comprise turbidite fans and other clastic sediments, which can be mapped from the basin flank to the basin floor. The...
Poster
Fault relays are important points of sediment entry into rift basins, often with high-sediment input. The interaction of fault relay ramps and subaqueous turbidity systems have been primary studied through sandbox and numerical modelling, as well as seismic data, and are biased towards syn-rift and early stage relay settings. In those settings, sub...
Article
Full-text available
A ‘top-to-the-east’ ultramylonite zone is identified in north-eastern Kuala Lumpur and named here as the ‘Ukay Perdana Shear Zone (UPSZ). The UPSZ is at least 250–300 m thick, east-verging, and superimposed on the later stages of assembly of the c. 200 Ma S-type ‘Western Belt’ granite plutons generated by crustal thickening and assigned to the Main...
Presentation
The North Falkland Basin, a Mesozoic-aged sedimentary basin, located 40 km north of the Falkland Islands, is a rift system comprising a series of offset depocentres. The largest of the depocentres, the Eastern Graben, has a proven petroleum system hosting stratigraphic and combined structural-stratigraphic traps. In the shallow section overlying th...
Poster
Subduction beneath the South American plate along the Magallanes–Fagnano Fault becomes transpressional along the North Scotia Ridge, whereby the Burdwood Bank, has been accreted on to the southern margin of the Falkland Plateau. This activity formed the North Scotia Ridge (NSR), a seismically active, submerged, oblique-compressional plate boundary...
Conference Paper
Full-text available
The controls, and their relative level of influence, on sedimentary fill in deep-lacustrine basins versus that of their deep-marine counterparts remains an interesting and potentially under-appreciated topic in the literature. Despite there being comparable controls on sedimentation in both settings, such as the influence of tectonics on sediment d...
Poster
Full-text available
Arid lacustrine systems provide a major sink for sediment transportation in arid continental basins. However, the extremely heterogeneous nature of lacustrine margin deposits, as influenced by surrounding depositional environments, makes the distribution of reservoir quality extremely difficult to predict. While the preserved facies associations wi...
Conference Paper
Full-text available
Kuala Lumpur and Singapore lie on opposite sides of the Bentong-Raub Suture Zone: the locus of amalgamation and consolidation of the Sibumasu Block with the southern part of the Sukhothai Arc and Indochina-East Malaya Block. These continental blocks separated sequentially from the supercontinent of Gondwana during the Permian and Lower Devonian res...
Conference Paper
Full-text available
The Kenny Hill Formation (Yin, 1961) represents a heterogeneous metasedimentary succession of possibly upper Carboniferous to middle Permian age (Stauffer, 1973; Hashim, 1985) exposed in outcrop in the Western Belt of Peninsular Malaysia, including Selangor, Kuala Lumpur and Putrajaya. As these regions are already heavily urbanised, and continue to...
Conference Paper
Full-text available
The identification and characterisation of clastic injectites and their close spatial association with hydrocarbon-bearing reservoirs is important, considering the ability of injectite networks to form effective fluid-flow conduits in the subsurface. Furthermore, the exact nature of sedimentary flow regimes during injection events is still a matter...
Article
Full-text available
Six plutons of granitic to gabbroic rocks have been recognised in the poorly exposed ground of north and east Singapore using new data from borehole cores and field observations. Five of the plutons were emplaced sequentially during the period 285-230 Ma, and these have been grouped within a single parent unit (Bukit Timah Centre) in a new lithodem...
Article
Full-text available
Singapore bedrock geology is dominated by late Permian to Triassic arc magmatism and a genetically related, essentially Middle to Upper Triassic, marine to fluvial volcano-sedimentary inner forearc succession. These Mesozoic strata are deformed into a pattern of NE-translated ductile–brittle deformation structures during the latest Triassic to earl...
Poster
Full-text available
Salt is recognised to laterally seal potential reservoir rocks adjacent to the flanks of salt walls. Halokinetic uplift and erosion of the flanks, coupled with salt withdrawal from, and subsidence of, the intervening areas, produces salt 'minibasins' with a sedimentary fill typically characterised by complex unconformities at sub-seismic scale. The...
Article
Full-text available
Modern, tide‐dominated and tide‐influenced coastlines are characterised by a range of environments, including deltas, estuaries, and lagoons. However, some tide‐dominated basins and related sedimentary units in the rock record, such as the semi‐enclosed, shallow, Utah‐Idaho Trough foreland basin of the Jurassic Curtis sea, do not correspond to any...
Article
Full-text available
The North Falkland Basin represents one of the frontier areas for hydrocarbon exploration in the South Atlantic. This study presents the results of new subsurface mapping using 2D seismic data in the north of the Falkland Islands offshore area, which has delineated a series of discrete grabens northwards of the main North Falkland Basin, referred c...
Poster
Full-text available
The bedrock geology of Singapore records the evolution of a complex Palaeotethyan forearc basin in which sedimentation was strongly influenced by contemporaneous arc magmatism. Subsequent closure of this basin resulted in folding and thrusting of this terrestrial to marine sedimentary succession, followed by its fragmentation and dispersal by trans...
Poster
Full-text available
Despite recent hydrocarbon discoveries within large-scale sandstone injectites, smaller features remain poorly understood. Smaller-scale (1-10 cm wide) sandstone injectites are regularly observed in many hydrocarbon-filled reservoirs, but typically overlooked. However, the fact that they are commonly intersected by a 6-8 inch core barrel, some of t...
Poster
Full-text available
Throughout the last decade, hydrocarbon exploration focus has shifted to lacustrine basins, with a number of major discoveries being made; the Sea Lion Fan in the North Falkland Basin (NFB) being a prime example. The NFB is a half-graben that formed as a result of east-west extension, associated with the opening of the South Atlantic in the early C...
Poster
Full-text available
Typical problems when interpreting rifting histories include determining whether the rift system evolved under an extensional or transtensional stress regime, as well as the added complexity of reactivation of inherited basement structures and multiple rifting phases with different stress directions. Added to this are complexities regarding basin i...
Research
Full-text available
This report summarises the results of the “Jurassic stratigraphy of the Faroe-Shetland region” project which was conducted as part of the Phase 3 of the Faroe-Shetland Consortium. The work was carried out on the Jurassic strata within a defined area of study located in the Faroe-Shetland Basin and adjacent areas. It is an amalgamation of three spec...
Conference Paper
Full-text available
A comprehensive understanding of Singapore's geology is critical to both future development and ongoing management of the subsurface. The British Geological Survey (BGS) is working with the Singapore Building and Construction Authority (BCA) to deliver a modern geological knowledge-base to benefit the widest possible stakeholder community. BCA have...
Conference Paper
Full-text available
As a whole, ancient deep-lacustrine turbidite deposits remain poorly understood and are rarely documented in current literature. In recent years, these sedimentary deposits have demonstrated a capacity to form extensive, good-quality hydrocarbon reservoirs. The early Cretaceous Sea Lion Fan represents the deposits of a deep-lacustrine, partially-co...
Conference Paper
Full-text available
To address competing land-use requirements, and the needs of an ever-growing population, Singapore looks to the subsurface to meet many of its future development needs. The subsurface is now considered an attractive development space for, amongst other things, energy production and infrastructure, waste disposal and treatment, groundwater abstracti...
Conference Paper
Full-text available
To address competing land-use requirements, and the needs of an ever-growing population, Singapore looks to the subsurface to meet many of its future development needs. The subsurface is now considered an attractive development space for, amongst other things, energy production and infrastructure, waste disposal and treatment, groundwater abstracti...
Poster
Full-text available
As a whole, ancient lacustrine turbidites are rarely documented and only ever briefly described in the literature. In recent years, these sedimentary deposits have been proven to form extensive, good-quality hydrocarbon reservoirs. The Sea Lion Fan Complex, a series of early Cretaceous, deep-lacustrine turbidites, in the North Falkland Basin provid...
Poster
Full-text available
Ancient, deep-lacustrine fans are rarely described in academic literature. Here we document the various styles of, and controls on, sub-aqueous, sand-rich fan systems. These systems are intercalated with organic-rich source rocks in the lacustrine petroleum system of the early Cretaceous North Falkland Basin. The North Falkland Basin is an asymmetr...
Conference Paper
Full-text available
The Falkland Islands are surrounded by five Mesozoic sedimentary basins, the most prolific of these basins, the North Falkland Basin, has seen considerable exploration interest and success over recent years. The North Falkland Basin can be divided into two main structural elements: a main north-south trending graben in the north; and a series of sm...
Conference Paper
Full-text available
Throughout the last decade, deep lacustrine turbidite fans have been the main reservoir target for hydrocarbon exploration in the North Falkland Basin. These deposits remain poorly understood, with few examples of such systems described in the literature. A number of vertically-stacked, turbidite fans have been mapped using conventionally-processed...
Conference Paper
Full-text available
Examples of sand-rich lacustrine turbidite systems are relatively rare in the literature. Here we document the various styles of, and controls on, sub-aqueous sandy fan systems intercalated with organic-rich source rocks in a lacustrine petroleum system of early Cretaceous age in the North Falkland Basin. The lake system occupied an asymmetric rift...
Poster
Full-text available
Deep-lacustrine turbidite deposits are still globally vastly understood, with very few examples of such systems described in the literature. Lacustrine basins are well-documented as globally-prolific hydrocarbon provinces and tend to accumulate thick deposits of world-class source rocks. The North Falkland Basin (NFB) is no exception to this. If su...
Conference Paper
Full-text available
A key factor that exerts a significant control on sand-body type and distribution in fluvial fan successions is the degree to which channel bodies are fixed in position by vegetation that can act as a significant agent to stabilize the substrate through its ability to bind and trap loose sediment, thereby influencing both rates of lateral channel m...

Questions

Questions (3)
Question
Was the original work completed on marine or lacustrine deep-water systems? I have read a number of publications that suggest the area was a deepwater, marine basin. But nothing conclusive so far. I have heard murmurings from people suggesting the work may have been on deep-lacustrine turbidites (in-passing and on ReseachGate), but cannot find any evidence for this in the literature (I haven't looked extensively yet, which is why I thought I would first ask on here).
On a separate note, I found it frustrating that I couldn't easily (openly) locate the original text on the internet... It must live somewhere for everyone to access? Surely? It was going for £258 on Amazon!
Any help with this would be greatly appreciated :)
Tom
Question
I am working on a suite of re-mobilized sandstones (injectites) from the North Falkland Basin. Does anyone have examples of 'ripple structures', or 'ripple cross lamination' (or cross-bedding for that matter) observed within injectites in the literature? Or that they have observed when working on these structures? Currently, the only examples I can find are from Smeyers and Peterson (1971), Van der Meer et al. (2009) and Phillips et al. (2013).
Any help finding additional examples would be greatly appreciated. :)
Tom
Question
I am currently working on a particular deepwater sedimentary system, which probably records processes and deposition within a forearc setting. The effects and deposits from a nearby volcanic terrane (both terrestrial and sub-aqueous eruptions) are clear throughout the succession. I have found a number of comparable systems in the literature, but there seems to be a general lack of information concerning this type of setting . If anyone has any good examples of a such a system, which I have not already found, it would be greatly appreciated.

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Projects

Projects (4)
Project
To further develop geological and geoscience research, skills and knowledge in Southeast Asia.
Project
Sedimentology, structural geology and basin analysis: ancient dryland environments (Utah)