Ann E. Cook
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View article: Evidence for gas hydrate-filled fractures forming at the sulfate-methane transition zone, Hikurangi subduction margin, New Zealand
Evidence for gas hydrate-filled fractures forming at the sulfate-methane transition zone, Hikurangi subduction margin, New Zealand Open
Using high-resolution X-ray computed tomography (X-CT) of sediment cores from International Ocean Discovery Program Expedition 372 offshore New Zealand, we identify a network of near-vertical, low-density structures interpreted as relics o…
View article: Data report: gas hydrate assessment in Baffin Bay at IODP Expedition 400 drill sites
Data report: gas hydrate assessment in Baffin Bay at IODP Expedition 400 drill sites Open
International audience
View article: Dissociating Gas Hydrate Beneath the Hydrate Stability Zone
Dissociating Gas Hydrate Beneath the Hydrate Stability Zone Open
Vast amounts of carbon are stored beneath the seafloor in the form of methane hydrate. Hydrate is stable at moderate pressure and low temperature at a depth extending several hundred meters beneath the seafloor to the base of gas hydrate s…
View article: Unlocking the Style and Timing of Submarine Landslides: Insights From the Tuaheni North Slide, Hikurangi Margin
Unlocking the Style and Timing of Submarine Landslides: Insights From the Tuaheni North Slide, Hikurangi Margin Open
We investigate the morphology and timing of Tuaheni North, a large submarine landslide within the Tuaheni Landslide Complex on Aotearoa New Zealand's Hikurangi Margin. We show a clear correlation between two major source volumes from Tuahe…
View article: Pockmark Occurrence in the Northern Gulf of Mexico Influenced by Glacial Cycles and Hydrate Stability
Pockmark Occurrence in the Northern Gulf of Mexico Influenced by Glacial Cycles and Hydrate Stability Open
On the continental slope of the northern Gulf of Mexico, pockmarks concentrate near the estimated updip edge of the hydrate stability zone (HSZ). We identified 5,691 pockmarks in the northern Gulf of Mexico by combining existing records wi…
View article: Style and timing of the Tuaheni North landslide off the Hikurangi Margin
Style and timing of the Tuaheni North landslide off the Hikurangi Margin Open
Submarine landslides are hazardous events capable of triggering deadly tsunamis and destroying costly seafloor infrastructure worldwide. Accurate landslide dating provides insights into their origins, recurrence patterns, and potential lin…
View article: UT-GOM2-2 Preliminary Report Terrebonne Basin Northern Gulf of Mexico
UT-GOM2-2 Preliminary Report Terrebonne Basin Northern Gulf of Mexico Open
In the summer and fall of 2023, the Gulf of Mexico Deepwater Hydrate Coring Expedition (UT-GOM2-2) drilled, cored, made downhole measurements, and analyzed samples from the seafloor to the base of the gas hydrate stability zone in one loca…
View article: Bottom simulating reflections across the northern Gulf of Mexico slope
Bottom simulating reflections across the northern Gulf of Mexico slope Open
Bottom simulating reflections (BSRs) are widely used indicators for natural gas hydrate in reflection seismic data. BSRs, however, are typically studied on a local scale at a single site and less frequently on a large, regional scale. Here…
View article: Gas hydrate in the North Carnarvon Basin, offshore Western Australia
Gas hydrate in the North Carnarvon Basin, offshore Western Australia Open
of hydrate systems across basins is not common, as most studies are focused on smaller sites. Using petroleum industry well and seismic data, we identify natural gas hydrate accumulations across the entire North Carnarvon Basin, offshore W…
View article: Widespread gas hydrate on Earth’s continental margins
Widespread gas hydrate on Earth’s continental margins Open
Over the last decade, our research team at Ohio State University has analyzed geophysical well logs in over 1000 petroleum industry wells for natural gas hydrate. This is the largest well log assessment for gas hydrate and includes a numbe…
View article: A diminishing stabilizer? Studies on the influence of ice and gas hydrates on the geo-mechanical properties of sediments.
A diminishing stabilizer? Studies on the influence of ice and gas hydrates on the geo-mechanical properties of sediments. Open
Natural gas hydrates form at elevated pressure and low temperatures in the presence of sufficient quantities of gas and water and have therefore been discovered on all continental margins and in permafrost regions. In the marine hydrate-be…
View article: Small fractures in marine muds indicating nascent hydrate formation
Small fractures in marine muds indicating nascent hydrate formation Open
On many marine continental slopes, gas hydrate has been observed filling fractures in marine muds.  Fracture filling hydrate likely forms because the pore size of clays is small, and therefore, hydrate can only form in secondary poros…
View article: A Flat‐Lying Transitional Free Gas to Gas Hydrate System in a Sand Layer in the Qiongdongnan Basin of the South China Sea
A Flat‐Lying Transitional Free Gas to Gas Hydrate System in a Sand Layer in the Qiongdongnan Basin of the South China Sea Open
Most marine gas hydrate systems follow a vertical pattern with hydrate overlying free gas. Here we document the discovery of a gas to hydrate system in a horizontal sand layer in the Qiongdongnan Basin of the South China Sea. Eight wells w…
View article: Estimating Compressional Velocity and Bulk Density Logs in Marine Gas Hydrates Using Machine Learning
Estimating Compressional Velocity and Bulk Density Logs in Marine Gas Hydrates Using Machine Learning Open
Compressional velocity (Vp) and bulk density (ρb) logs are essential for characterizing gas hydrates and near-seafloor sediments; however, it is sometimes difficult to acquire these logs due to poor borehole conditions, safety concerns, or…
View article: A Flat-lying Transitional Free Gas to Gas Hydrate System in a Sand Layer in the Qiongdongnan Basin of the South China Sea
A Flat-lying Transitional Free Gas to Gas Hydrate System in a Sand Layer in the Qiongdongnan Basin of the South China Sea Open
Most marine gas hydrate systems follow a vertical pattern with gas hydrate overlying free gas. Here we document the discovery of a novel flat-lying transitional gas to hydrate system in a horizontal sand layer in the Qiongdongnan Basin of …
View article: A Flat-lying Transitional Free Gas to Gas Hydrate System in a Sand Layer in the Qiongdongnan Basin of the South China Sea
A Flat-lying Transitional Free Gas to Gas Hydrate System in a Sand Layer in the Qiongdongnan Basin of the South China Sea Open
Most marine gas hydrate systems follow a vertical pattern with gas hydrate overlying free gas. Here we document the discovery of a novel flat-lying transitional gas to hydrate system in a horizontal sand layer in the Qiongdongnan Basin of …
View article: Dating submarine landslides using the transient response of gas hydrate stability
Dating submarine landslides using the transient response of gas hydrate stability Open
Submarine landslides are prevalent on the modern-day seafloor, yet an elusive problem is constraining the timing of past slope failure. We present a novel age-dating technique based on perturbations to underlying gas hydrate stability caus…
View article: Investigating the Basal Shear Zone of the Submarine Tuaheni Landslide Complex, New Zealand: A Core‐Log‐Seismic Integration Study
Investigating the Basal Shear Zone of the Submarine Tuaheni Landslide Complex, New Zealand: A Core‐Log‐Seismic Integration Study Open
Although submarine landslides have been studied for decades, a persistent challenge is the integration of diverse geoscientific datasets to characterize failure processes. We present a core‐log‐seismic integration study of the Tuaheni Land…
View article: Dating submarine landslides using the transient response of gas hydrate stability
Dating submarine landslides using the transient response of gas hydrate stability Open
Submarine landslides are prevalent on the modern-day seafloor, yet an elusive problem is constraining the timing of slope failure. Herein, we present a novel technique for constraining the age of submarine landslides without sediment core …
View article: UT-GOM2-2 Prospectus: Science and Sample Distribution Plan
UT-GOM2-2 Prospectus: Science and Sample Distribution Plan Open
The University of Texas (UT), Genesis of Methane Hydrate in Coarse-Grained Systems: Northern Gulf of Mexico Slope Project (GOM2), will perform the UT-GOM2-2 drilling and coring expedition in the Terrebonne Basin, Gulf of Mexico outer conti…
View article: Diverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexico
Diverse gas composition controls the Moby-Dick gas hydrate system in the Gulf of Mexico Open
In marine basins, gas hydrate systems are usually identified by a bottom simulating reflection (BSR) that parallels the seafloor and coincides with the base of the gas hydrate stability zone (GHSZ). We present a newly discovered gas hydrat…
View article: IODP Expedition 372, Hole U1519A - Well Logging Data
IODP Expedition 372, Hole U1519A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1518B - Well Logging Data
IODP Expedition 372, Hole U1518B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1517A - Well Logging Data
IODP Expedition 372, Hole U1517A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1518B - Well Logging Data
IODP Expedition 372, Hole U1518B - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 372, Hole U1520A - Well Logging Data
IODP Expedition 372, Hole U1520A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …