Unconventional Energy Resources: Making the Unconventional Conventional: 29th Annual

Carr, Tim; D’Agostino, Tony; Ambrose, William A.; Pashin, Jack C.; Rosen, Norman C.

doi:10.5724/gcs.09.29

Cited by 2 publications

(1 citation statement)

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“…They are mainly affected by the host rock composition, deformation mechanisms, and stress history (Knipe et al, 1998). Although challenging, structural diagenesis is becoming increasingly essential for a broad range of applications, including extracting hydrocarbon resources (Lander et al, 2008;Laubach et al, 2009) and predicting the behavior of injected fluids in the subsurface (Tsang et al, 2000;Tsang, 2005;Dockrill and Shipton, 2010). In particular, the movement of fluids through open fracture systems in the rift basin setting is of significance due to the combination of episodic fluid flow and fracturing events.…”

Section: Introductionmentioning

confidence: 99%

Structural diagenesis and dolomitization of Cenozoic post-rift carbonates in the Red Sea rift basin: A multiproxy approach

Herlambang

Koeshidayatullah²,

Amao³

et al. 2022

Front. Earth Sci.

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Middle Miocene post-rift sediments are considered prolific subsurface reservoirs, representing one of the thickest sequences in the Red Sea rift basin. In the Umm Luj Basin of the eastern Red Sea, post-rift sediments are well exposed and represented by a carbonate-dominated system of the Raghama Formation. This formation was intensely fractured, following the rifting trend of the Red Sea. Such fractures and their associated diagenetic products could provide a significant archive of past tectonic fluid evolution. However, little is known about the origin and timing of the different fluid flows and diagenetic processes in the area. This study aims to resolve this issue by integrating fracture and multiproxy geochemical analyses of calcite precipitated in veins, fault breccia, and dolomitized host rock. The δ18O and δ13C isotopic compositions of calcite veins show tight clustering, varying between −10.6 and −9.5‰ and between −7.9 and −7.2‰, respectively. Meanwhile, the precipitated calcite along the fault breccia exhibited a closer to host rock isotopic composition (δ18O = −6.8‰; δ13C = −4.8‰). The δ18OVPDB of the dolomitized host rock shows a heavier average value, closer to the expected range of Miocene seawater. X-ray diffraction analysis shows that the veins have a high magnesium calcite content (up to 79.5%). In contrast, all the host rock samples, except samples 1-1BH, have dolomite contents of up to 94.3%, as well as breccia fragments. Thus, we argue that the structural diagenesis history of the study area comprises two distinct fluid members and tectonic events. The first member is the deposition of heavier isotopic composition related to dolomitization at slightly higher temperatures of up to 42.2°C. The second fluid flow member corresponded to a depleted isotopic calcite member with a temperature of 33°C. Compared with the Midyan Peninsula, the study area shares the same regional tectonic events, but the local tectonic and depositional settings could act as the determining factors of the dolomitization mechanism and meteoric alteration in each location. Hence, our results provide a new understanding of paleo-fluid circulation related to the evolution of tectonic events and highlights the value of integrating fracture and multiproxy geochemical analysis for structural diagenetic studies.

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Section: Introductionmentioning

confidence: 99%

Structural diagenesis and dolomitization of Cenozoic post-rift carbonates in the Red Sea rift basin: A multiproxy approach

Herlambang

Koeshidayatullah²,

Amao³

et al. 2022

Front. Earth Sci.

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Testing the basin-centered gas accumulation model using fluid inclusion observations: Southern Piceance Basin, Colorado

Fall¹,

Eichhubl²,

Cumella³

et al. 2012

Bulletin

109

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The Upper Cretaceous Mesaverde Group in the Piceance Basin, Colorado, is considered a continuous basin-centered gas accumulation in which gas charge of the low-permeability sandstone occurs under high pore-fluid pressure in response to gas generation. High gas pressure favors formation of pervasive systems of opening-mode fractures. This view contrasts with that of other models of low-permeability gas reservoirs in which gas migrates by buoyant drive and accumulates in conventional traps, with fractures an incidental attribute of these reservoirs. We tested the aspects of the basin-centered gas accumulation model as it applies to the Piceance Basin by determining the timing of fracture growth and associated temperature, pressure, and fluid-composition conditions using microthermometry and Raman microspectrometry of fluid inclusions trapped in fracture cement that formed during fracture growth. Trapping temperatures of methane-saturated aqueous fluid inclusions record systematic temperature trends that increase from approximately 140 to 185°C and then decrease to approximately 158°C over time, which indicates fracture growth during maximum burial conditions. Calculated pore-fluid pressures for methanerich aqueous inclusions of 55 to 110 MPa (7977-15,954 psi) indicate fracture growth under near-lithostatic pressure conditions consistent with fracture growth during active gas maturation and charge. Lack of systematic pore-fluid-pressure trends

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Unconventional Energy Resources: Making the Unconventional Conventional: 29th Annual

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Cited by 2 publications

References 0 publications

Structural diagenesis and dolomitization of Cenozoic post-rift carbonates in the Red Sea rift basin: A multiproxy approach

Structural diagenesis and dolomitization of Cenozoic post-rift carbonates in the Red Sea rift basin: A multiproxy approach

Testing the basin-centered gas accumulation model using fluid inclusion observations: Southern Piceance Basin, Colorado

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