The Evolution of the Kharyaga Carbonate Platform During the Devonian - Carbonate Response to the Structural Heritage

Spina, Vincenzo; Borgomano, Jean; Nely, Georges; Щукина, Н.В.; Irving, Alan; Neumann, Catherine; Neillo, V.

doi:10.3997/2214-4609.20140800

Cited by 2 publications

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“…Reservoir productivity cannot be simply attributed to fast communication along faults cutting the top of the reservoir. However, faults are a structural element that can be reliably detected through reflection seismic before drilling while diagenetic and depositional heterogeneities can only be identified after drilling and extensive well log -core analysisseismic data correlation of a minimum of 20 wells in a 20 km 2 reservoir block (Spina et al 2014). Before the 3D stratigraphic and sequential architecture of a carbonate platform can be simulated from information of a number of wells and 3D seismic data, identifiable seismic-scale faults may play a primary role in targeting of geothermal wells in a new prospect (e.g.…”

Section: Implication For Geothermal Explorationmentioning

confidence: 99%

Multiphase fossil normal faults as geothermal exploration targets in the Western Bavarian Molasse Basin: Case study Mauerstetten

Mraz¹,

Moeck²,

Bißmann³

et al. 2018

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The Bavarian Molasse Basin represents a peripheral foreland basin hosting abundant hydrothermal resources in 3-5 km deep Upper Jurassic carbonate rocks. Faults and facies play a major role in targeting production wells; however the kinematic evolution of fault zones and the classification of carbonate facies of the Upper Jurassic are still debated. At the geothermal prospect Mauerstetten in the Western Bavarian Molasse Basin, a geothermal well and a side track are drilled along and about 650 m off an ENE-WSW striking normal fault. A stratigraphy related fault throw analysis of six 2D seismic sections crossing this fault evidences multiphase normal faulting from Cretaceous to Upper Miocene with a major activity phase in the Oligocene. This fault, inactive since Upper Miocene, is presumably a fossil normal fault in the present-day stress field that has a maximum horizontal stress direction in N-S. Analysis of carbonate facies by thin section petrography of drill cuttings and geophysical borehole logs lead to two major conclusions: (i) the reservoir rock represents low permeable platform limestones, reef detritus and dolostones of the Franconian facies, and (ii) the fault consists of multiple normal faulting steps with higher permeability than in intact rock. This observation suggests a fracture controlled reservoir with permeable damage zones in a tight rock mass along reactivated normal faults.

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Section: Implication For Geothermal Explorationmentioning

confidence: 99%

Multiphase fossil normal faults as geothermal exploration targets in the Western Bavarian Molasse Basin: Case study Mauerstetten

Mraz¹,

Moeck²,

Bißmann³

et al. 2018

zdgg

View full text Add to dashboard Cite

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Integrated Workflow To Tackle Heterogeneous Karst Dominated Reservoirs: Kharyaga Example

2014

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Kharyaga Upper Devonian oil reservoir, developed through water injection, is part of a highly heterogeneous carbonate platform. Three sedimentary domains can be identified from South to North: a microbial reef-flat, back-barrier grainy shoals and a non-reservoir lagoon. Static and dynamic data gathered since production start-up revealed that the barrier is extensively fractured and karstified and shows a dual permeability behavior. Understanding the distribution of the dual medium is key to successful development of such a complex reservoir.To capture the relative weight on the flow network of each type of heterogeneity, a new workflow to characterize the dual medium has been developed, including the following steps: karst facies identification from cores and borehole images, comparison of the karst facies over a detailed flow analysis including detailed PLT interpretation; analysis of the facies spatial distribution using various diagenetic scenarios. As a result a new integrated vision of the reservoir and flow system has been consolidated and 3 main emersions followed by a hydrothermal phase have been identified. Each individual emersion generated a complex karst system composed of several components linked to the paleo-topography.Representing properly such a heterogeneous system was coped with by iterating in order to match the dynamic data. A two-stage modeling workflow was used: (1) fast iteration process using a dedicated stochastic tool which generates karst conduits, constrained by infiltration zone, paleo-water-table and paleo-topography; (2) once the right inputs are captured, the forward modeling workflow simulated the process of dissolution and generated at very fine scale a more complex and more consistent system.Finally, this work allowed to model different representations of this complex reservoir capturing the range of remaining subsurface uncertainties and consistent with the integrated interpretation of static and dynamic data. It allows to highlight and evaluate quantitatively the stakes of current and potential new development.

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The Evolution of the Kharyaga Carbonate Platform During the Devonian - Carbonate Response to the Structural Heritage

Cited by 2 publications

References 0 publications

Multiphase fossil normal faults as geothermal exploration targets in the Western Bavarian Molasse Basin: Case study Mauerstetten

Multiphase fossil normal faults as geothermal exploration targets in the Western Bavarian Molasse Basin: Case study Mauerstetten

Integrated Workflow To Tackle Heterogeneous Karst Dominated Reservoirs: Kharyaga Example

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