Development of Sediment Overpressure and Its Effect on Thermal Maturation: Application to the Gulf of Mexico Basin

Mello, Garry D. Karn Ulisses T.

doi:10.1306/64ed9a42-1724-11d7-8645000102c1865d

Cited by 20 publications

(3 citation statements)

References 50 publications

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“…Sedimentation rates are compatible with observations constraining facies assignment, described above, as well as work suggesting that the Cenozoic sedimentation rate in the northern Gulf of Mexico has ranged anywhere from 30 m/Myr to 1 km/Myr (Kennett & Shackleton, 1975; Mello & Karner, 1996; Santschi & Rowe, 2008).…”

Section: Methodssupporting

confidence: 83%

“…(2017), Portnov et al. (2020) (for model geometries, namely salt diapir geometry); Athy (1930), Horai (1971), Kennett and Shackleton (1975), Keen and Lewis (1982), Mello and Karner (1996), McKenna and Sharp (1998), Prather et al. (1998), Revil (2000), Santschi and Rowe (2008), Hantschel and Kauerauf (2009), Boswell, Collett, et al.…”

Section: Data Availability Statementmentioning

confidence: 99%

“…suggesting that the Cenozoic sedimentation rate in the northern Gulf of Mexico has ranged anywhere from 30 m/Myr to 1 km/Myr (Kennett & Shackleton, 1975;Mello & Karner, 1996;Santschi & Rowe, 2008). l Horai (1971), Revil (2000), Burwicz et al (2017), andPortnov et al (2020).…”

Section: Saltmentioning

confidence: 99%

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Salt Diapir‐Driven Recycling of Gas Hydrate

Burton

Dafov

2023

Geochem Geophys Geosyst

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By harnessing both hypothetical, synthetic basin and gas hydrate (GH) system models and real‐world models of well‐studied salt diapir‐associated GH sites at Green Canyon (Gulf of Mexico) and Blake Ridge (U.S. Atlantic coast), we propose and demonstrate salt movement (and in particular, diapirism) to be a new mechanism for the recycling of marine GH. At Green Canyon, for example, we show that by considering this newly proposed diapir‐driven recycling mechanism in conjunction with previously proposed lithological control on sandy‐reservoir‐hosted hydrate at the base of the GH stability zone (BGHSZ; ∼bottom‐simulating reflector, BSR), modeled GH saturations match drilling data. Overall, salt diapir movement‐induced GH recycling provides a temperature‐driven mechanism by which GH saturations at the BGHSZ may reach >90 vol. % and by which GH volumes near and free gas volumes beneath the BGHSZ may be increased significantly through time. Interestingly, comparison of salt diapir‐driven recycling and sediment burial‐driven recycling scenarios suggests notably higher rates of recycling via diapir‐driven versus burial‐driven processes. Our results suggest that GH and associated free gas accumulations above salt diapir crests represent particularly attractive targets for unconventional and conventional hydrocarbon resource exploration and for scientific and academic drilling expeditions aimed at exploiting GH systems. Salt basins containing GH systems—including passive margin basins of the Gulf of Mexico, southeastern Brazil, and southwestern Africa—are therefore compelling localities for studying salt‐driven GH recycling and for salt diapir‐associated natural gas exploration.

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Section: Methodssupporting

confidence: 83%

Section: Data Availability Statementmentioning

confidence: 99%

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Salt Diapir‐Driven Recycling of Gas Hydrate

Burton

Dafov

2023

Geochem Geophys Geosyst

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Mud Volcanoes, Geodynamics and Seismicity

Martinelli¹,

Panahi²

2005

NATO Science Series

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Caractérisation des eaux souterraines profondes à l’aide de données provenant de puits d’exploration pétrolière et gazière dans le bassin inférieur de Kutai, en Indonésie

Arifin,

Shamsudduha,

Ramdhan

et al. 2024

Hydrogeol J

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Groundwater at depths exceeding 500 m can be an important source of freshwater. However, the characteristics of deep groundwater in many regions of the world, including Indonesia’s sedimentary basins, remain vaguely defined. This study investigates the pressure regimes, hydraulic head distributions, salinity, and hydrochemical facies of deep groundwater using available evidence from oil and gas exploration wells in the Lower Kutai Basin of Indonesia. Pressure measurements and wireline log data reveal three pressure regimes within the basin: hydrostatic, overpressure, and underpressure. The top of the overpressure varies, from close to the surface onshore to depths of ~4.5 and ~3.8 km in the Mahakam Delta and offshore, respectively. Computed hydraulic heads at the top of the overpressure range from ~191 m above sea level onshore to ~71 m below sea level offshore, and are indicative of regional groundwater flow. The observed salinity of deep groundwater within the basin indicates predominantly brackish or saline conditions. Fresh (total dissolved solids < 1 g/L) groundwater to a depth of ~2 km is found at a small minority of wells onshore and in the delta; no fresh groundwater is found offshore. Four hydrochemical facies are observed: Na+/Cl–, Ca2+/Cl–, Na+/HCO3–, and Na+–Ca2+/HCO3–. This study indicates that deep fresh groundwater in the Lower Kutai Basin is of localized occurrence. Recharge from meteoric water may replenish deep fresh groundwater within the hydrostatic zone and sustain water supplies, whether brackish or fresh. Water produced from clay diagenesis is also cited as a possible process of freshening deep groundwater.

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Development of Sediment Overpressure and Its Effect on Thermal Maturation: Application to the Gulf of Mexico Basin

Cited by 20 publications

References 50 publications

Salt Diapir‐Driven Recycling of Gas Hydrate

Salt Diapir‐Driven Recycling of Gas Hydrate

Mud Volcanoes, Geodynamics and Seismicity

Caractérisation des eaux souterraines profondes à l’aide de données provenant de puits d’exploration pétrolière et gazière dans le bassin inférieur de Kutai, en Indonésie

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