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Two-step wireline log analysis of overpressure in the Bekapai Field, Lower Kutai Basin, Indonesia (2017)
Journal Article
Ramdhan, A. M., & Goulty, N. R. (2018). Two-step wireline log analysis of overpressure in the Bekapai Field, Lower Kutai Basin, Indonesia. Petroleum Geoscience, 24(2), 208-217. https://doi.org/10.1144/petgeo2017-045

As part of our effort to improve pore-pressure estimation in diagenetically altered mudstones, we have used wireline logs to estimate disequilibrium compaction and unloading contributions to the hard overpressure encountered in the Bekapai Field, Low... Read More about Two-step wireline log analysis of overpressure in the Bekapai Field, Lower Kutai Basin, Indonesia.

Compaction of diagenetically altered mudstones – Part 2: Implications for pore pressure estimation (2016)
Journal Article
Goulty, N., & Sargent, C. (2016). Compaction of diagenetically altered mudstones – Part 2: Implications for pore pressure estimation. Marine and Petroleum Geology, 77, 806-818. https://doi.org/10.1016/j.marpetgeo.2016.07.018

Diagenetically altered mudstones compact mechanically and chemically. Consequently, their normal compaction trends depend upon their temperature history as well as on the maximum effective stress they have experienced. A further complication is that... Read More about Compaction of diagenetically altered mudstones – Part 2: Implications for pore pressure estimation.

Compaction of diagenetically altered mudstones - Part 1: Mechanical and chemical contributions (2016)
Journal Article
Goulty, N., Sargent, C., Andras, P., & Aplin, A. (2016). Compaction of diagenetically altered mudstones - Part 1: Mechanical and chemical contributions. Marine and Petroleum Geology, 77, 703-713. https://doi.org/10.1016/j.marpetgeo.2016.07.015

At low temperatures, siliciclastic mudstones compact mechanically. Above 70C, where the smectite-to-illite transformation dominates clay diagenesis, they also compact chemically, provided that excess pore water can escape. There are two prevailing co... Read More about Compaction of diagenetically altered mudstones - Part 1: Mechanical and chemical contributions.

Influence of stratigraphic setting and simple shear on layer-bound compaction faults offshore Mauritania (2011)
Journal Article
Ireland, M., Goulty, N., & Davies, R. (2011). Influence of stratigraphic setting and simple shear on layer-bound compaction faults offshore Mauritania. Journal of Structural Geology, 33(4), 487-499. https://doi.org/10.1016/j.jsg.2010.11.005

We have used three-dimensional seismic data to examine the geometry of layer-bound compaction faults on the Mauritanian continental margin. The faults deform a fine-grained Neogene unit which mantles buried canyons. Above the canyons, most layer-boun... Read More about Influence of stratigraphic setting and simple shear on layer-bound compaction faults offshore Mauritania.

Stress state in the Cuu Long and Nam Con Son basins, offshore Vietnam (2011)
Journal Article
Binh, N. T. T., Tokunaga, T., Goulty, N. R., Son, H. P., & Binh, M. V. (2011). Stress state in the Cuu Long and Nam Con Son basins, offshore Vietnam. Marine and Petroleum Geology, 28(5), 973-979. https://doi.org/10.1016/j.marpetgeo.2011.01.007

The results presented in this paper are the first published estimates of the complete stress tensor in the Cuu Long and Nam Con Son basins, offshore Vietnam. We analysed in situ stress and pore pressure fields in the sedimentary formations using data... Read More about Stress state in the Cuu Long and Nam Con Son basins, offshore Vietnam.

Overpressure generating mechanisms in the Peciko Field, Lower Kutai Basin, Indonesia (2010)
Journal Article
Ramdhan, A., & Goulty, N. (2010). Overpressure generating mechanisms in the Peciko Field, Lower Kutai Basin, Indonesia. Petroleum Geoscience, 16(4), 367-376. https://doi.org/10.1144/1354-079309-027

The Peciko Field contains gas in multiple stacked reservoirs within a Miocene deltaic sequence. In the deeper reservoirs, gas is trapped hydrodynamically by high lateral overpressure gradients. We have analysed overpressure and compaction in this fie... Read More about Overpressure generating mechanisms in the Peciko Field, Lower Kutai Basin, Indonesia.

Shallow seismic reflection profiles over Permian strata affected by gypsum dissolution in NE England (2010)
Journal Article
Sargent, C., & Goulty, N. (2010). Shallow seismic reflection profiles over Permian strata affected by gypsum dissolution in NE England. Quarterly Journal of Engineering Geology and Hydrogeology, 43(2), 221-232. https://doi.org/10.1144/1470-9236/08-115

In north-east England, dissolution of Permian gypsum beds has caused subsidence at many localities. We report results from trial 2D profiles at five sites to evaluate the seismic reflection method as a tool for site investigation. At all five sites,... Read More about Shallow seismic reflection profiles over Permian strata affected by gypsum dissolution in NE England.

Influence of pore water chemistry on silica diagenesis: evidence from the interaction of diagenetic reaction zones with polygonal fault systems (2010)
Journal Article
Ireland, M., Goulty, N., & Davies, R. (2010). Influence of pore water chemistry on silica diagenesis: evidence from the interaction of diagenetic reaction zones with polygonal fault systems. Journal of the Geological Society, 167(2), 273-279. https://doi.org/10.1144/0016-76492009-049

Three-dimensional seismic data from the NE Atlantic margin have revealed opal-A to opal-CT reaction zones hosted in Oligo-Pliocene strata as bright reflection events that cross-cut stratigraphic reflections. In some areas, the topographic relief at t... Read More about Influence of pore water chemistry on silica diagenesis: evidence from the interaction of diagenetic reaction zones with polygonal fault systems.

Use of 3D seismic to image subsurface foundering due to gypsum dissolution (2009)
Journal Article
Sargent, C., & Goulty, N. (2009). Use of 3D seismic to image subsurface foundering due to gypsum dissolution. First break, 27(8), 61-67

We have used the seismic reflection method to image subsurface foundering due to gypsum dissolution in northern England. The objective was to evaluate the method for site investigation in places where there might be a subsidence hazard due to voids,... Read More about Use of 3D seismic to image subsurface foundering due to gypsum dissolution.

Seismic reflection survey for investigation of gypsum dissolution and subsidence at Hell Kettles, Darlington, UK (2009)
Journal Article
Sargent, C., & Goulty, N. (2009). Seismic reflection survey for investigation of gypsum dissolution and subsidence at Hell Kettles, Darlington, UK. Quarterly Journal of Engineering Geology and Hydrogeology, 42(1), 31-38. https://doi.org/10.1144/1470-9236/07-071

There are thick beds of gypsum in the Permian Zechstein sequence which forms the bedrock in the Darlington area. In this area, subsidence features attributed to gypsum dissolution are typically broad shallow depressions up to 100 m in diameter, and t... Read More about Seismic reflection survey for investigation of gypsum dissolution and subsidence at Hell Kettles, Darlington, UK.

Geomechanics of polygonal fault systems: a review (2008)
Journal Article
Goulty, N. (2008). Geomechanics of polygonal fault systems: a review. Petroleum Geoscience, 14(4), 389-397. https://doi.org/10.1144/1354-079308-781

Layer-bound systems of polygonal faults are found in sequences of very fine-grained sediments that have typically undergone passive subsidence and burial. In the absence of tectonic extension, the heave of the faults must be complemented by horizonta... Read More about Geomechanics of polygonal fault systems: a review.

Geomechanical behaviour of the overburden above compacting hydrocarbon reservoirs--what would we predict from coalmining experience? (2008)
Journal Article
Goulty, N. (2008). Geomechanical behaviour of the overburden above compacting hydrocarbon reservoirs--what would we predict from coalmining experience?. First break, 26(10), 67-70

Observations of subsidence due to longwall coalmining and a time-lapse seismic profile over a longwall working have several implications for the geomechanical behaviour of the overburden above compacting hydrocarbon reservoirs. Subsidence at the grou... Read More about Geomechanical behaviour of the overburden above compacting hydrocarbon reservoirs--what would we predict from coalmining experience?.

Implications of simple flexure theory for the formation of saucer-shaped sills (2008)
Journal Article
Goulty, N., & Schofield, N. (2008). Implications of simple flexure theory for the formation of saucer-shaped sills. Journal of Structural Geology, 30(7), 812-817. https://doi.org/10.1016/j.jsg.2008.04.002

Saucer-shaped dolerite sills have been identified in several sedimentary basins. They are characteristically sub-circular in plan, with an inner sill connected to a steeply inclined arcuate sheet extending upwards from the edge of the inner sill, and... Read More about Implications of simple flexure theory for the formation of saucer-shaped sills.

Fluid flow due to the advance of basin-scale silica reaction zones (2008)
Journal Article
Davies, R., Goulty, N., & Meadows, D. (2008). Fluid flow due to the advance of basin-scale silica reaction zones. GSA Bulletin, 120(1-2), 195-206. https://doi.org/10.1130/b26099.1

The conversion of biogenic silica (opal-A) to opal-CT (cristobalite and tridymite) in biosiliceous sediment causes increased rates of water expulsion because of the reduction in sediment porosity and dehydration of the amorphous opal-A phase. This re... Read More about Fluid flow due to the advance of basin-scale silica reaction zones.

Tectonic structure of Central-Western Attica (Greece)based on geophysical invesigations - preliminary results (2007)
Journal Article
Papadopoulos, T., Goulty, N., Voulgaris, N., Alexopoulos, J., Fountoulis, I., Kambouris, P., …Lagios, E. (2007). Tectonic structure of Central-Western Attica (Greece)based on geophysical invesigations - preliminary results. Deltio tīs Ellīnikīs Geōlogikīs Etaireias Δελτίο της Ελληνικής Γεωλογικής Εταιρείας (online), 40(3), 1207-1218

In an effort to investigate the deep geological structure in the broader area of central-western Attica, that suffered severe damage during the destructive Athens earthquake of September 7th, 1999, the Department of Geophysics-Geothermics of the Facu... Read More about Tectonic structure of Central-Western Attica (Greece)based on geophysical invesigations - preliminary results.

Improved static corrections over sand dunes for seismic line NC151-V532, western Libya (2007)
Journal Article
Ushah, A., & Goulty, N. (2007). Improved static corrections over sand dunes for seismic line NC151-V532, western Libya

Concession NC151 is located in the northwestern part of the Murzuq Basin (Libya), which is covered by linear sand dunes that reach heights of ~100 m above the gravel plain. The sand dunes cause large increases in the travel times of reflected events... Read More about Improved static corrections over sand dunes for seismic line NC151-V532, western Libya.

Dependence of sonic velocity on effective stress in North Sea Mesozoic mudstones (2006)
Journal Article
Lubanzadio, M., Goulty, N., & Swarbrick, R. (2006). Dependence of sonic velocity on effective stress in North Sea Mesozoic mudstones. Marine and Petroleum Geology, 23(6), 647-653. https://doi.org/10.1016/j.marpetgeo.2006.06.002

Overpressure estimation methods that use sonic velocity as a proxy for porosity only account for excess pressure due to undercompaction, so the influence of unloading processes in generating overpressure is ignored. We have used wireline log data and... Read More about Dependence of sonic velocity on effective stress in North Sea Mesozoic mudstones.