Seismic lithostratigraphy of deep subsalt Permo‐Carboniferous gas reservoirs, Northwest German Basin

Mathisen, Mark E.; Budny, M.

doi:10.1190/1.1442783

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…8). The seismic tuning effect caused by the presence of the An-2 anhydrite layer overlying the Ca-2 carbonate layer has been noted by Mathisen & Budny (1990). From the seismic modelling results, 5 reflection patterns (Table 1) diagnostic of the Ca-2 carbonate layer are defined below the prominent black peak reflection (Fig.…”

Section: Ca-2 Carbonate Layermentioning

confidence: 84%

“…Porous Zechstein carbonate deposits of the Southern Zechstein Basin have for many years been the target of intense investigation, which has resulted in commercial hydrocarbon production in Great Britain, the Netherlands, Germany and Poland (Clark 1986;Maureau & van Wijhe 1979;Mathisen & Budny 1990;Antonowicz & Knieszner 1984). The present study focuses on the Danish part of the Southern Zechstein Basin situated in Southern Jutland using a database consisting of 10 wells (excluding the confidential Løgumkloster-2a/b well drilled in 19931.1 km southsouthwest of the Løgumkloster-1 well), and more than 2000 km of 2D seismic data acquired by various contractors (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Seismically detected porous Zechstein carbonates in Southern Jutland, Denmark

Maver¹

1995

bgsd

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Zechstein carbonates in Southern Jutland, Denmark, have been explored by 10 wells since 1952, and a total of more than 2000 km of 2D seismic data has been acquired by various contractors. Seismic modelling, based on all the well data, is used as an aid to predict the lateral distribution of porous Zechstein carbonate intervals from the seismic data. ID seismic modelling is used to define the maximum number of intervals detected by the seismic sections at well locations. The ID seismic modelling results are also used to derive 2D acoustic impedance models and corresponding synthetic seismograms. The seismic modelling results illustrate a number of diagnostic reflection patterns associated with the porous carbonate intervals. The predicted distribution of porous carbonate intervals is, however, found to be uncertain, as thickness and porosity variations of each interval cannot be distinguished. Furthermore, thin porous carbonate intervals are not detected by the seismic sections, and the seismic reflection patterns indicating the presence of porous carbonate intervals can be associated with other lithologies. Porous Ca-la, Ca-lb, Ca-2 and Ca-3 carbonate intervals are found to be detected by the seismic sections only in the Zechstein platform area, and only the porous Ca-2 carbonate interval can be mapped

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Section: Ca-2 Carbonate Layermentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Seismically detected porous Zechstein carbonates in Southern Jutland, Denmark

Maver¹

1995

bgsd

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“…Seismic exploration of porous Zechstein carbonates has previously been described by Maureau and van Wijhe (1979), Antonowicz and Knieszner (1984), and Mathisen and Budny (1990) in the Netherlands, Poland and Germany, respectively. These Authors describe seismic reflection patterns associated especially with carbonate layers.…”

Section: Introductionmentioning

confidence: 99%

POROSITY EVALUATION OF SEISMICALLY‐RESOLVED ZECHSTEIN CARBONATE LAYERS, LøGUMKLOSTER‐1 WELL, DENMARK

Maver

1995

Journal of Petroleum Geology

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Seismic modelling has been applied to define the porous carbonate intervals and lithologic boundaries resolved in the seismic section at the Løgumkloster‐ 1 Well, southern Jylland, Denmark, This well encountered a 14‐m thick, porous Zechstein carbonate interval (Ca‐2) with an oil show, but the well was plugged and abandoned. Band‐pass filtering and blocking of the acoustic‐impedance log in the time domain have been used to define a number of successive acoustic‐impedance models. The simplest of these, from which a synthetic seismogram correlates with the synthetic seismogram derived from the original acoustic‐impedance log, is assumed to define the maximum number of intervals resolved in the seismic section at the well location. As the well data was acquired in an area represented by a variable seismic reflection pattern, a new optimal seismic section CMP location was found, to optimise the correlation between the synthetic seismogram and the seismic section. Fifteen acoustic‐impedance intervals could be resolved in the seismic section at the Løgumkloster‐1 Well location, including the porous Ca‐2 carbonate interval. A close relationship was found between the Ca‐lb, Ca‐2 and Ca‐3 carbonate layers and lateral variations in the seismic reflection pattern, which indicates significant porosity variations.

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Geothermal potential of the Tubbergen Formation in the Twente region of east Netherlands

Veenstra¹,

Groot²,

Lange³

et al. 2020

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Here we report the potential geothermal prospectivity of clean sandstones in the Tubbergen Formation (Late Carboniferous) of the Twente area (eastern Netherlands). We were motivated by the prevailing paradigm that in The Netherlands geothermal power can only be harvested economically through large, expensive installations producing high-volumes from high-quality aquifers located between ca 1500 and 2500 m. No such aquifers are present in Twente. Our study shows that heat production is economically feasible from the Tubbergen Formation sandstones by producing smaller volumes from smaller, highly efficient installations that can be developed at considerably lower cost. Our reinterpretation of publicly available seismic and well data shows that potentially suitable sandstones occur over the whole area with thicknesses of up to 50 m, porosities reaching 20% and permeabilities reaching 300 mD. The Tubbergen Formation is ca 400-700 m thick in the study area and contains ca 60% sandstone. The top reservoir reaches ca 1500 m depth in the SW and the base reaches some 4300 m in the NE of the study area. The temperature is expected to range between 60-140 °C depending on depth. The Carboniferous is densely faulted with a block size of ca 3x4 km, each block being a potential target for geothermal development. To determine the economic feasibility, we performed an economic screening for a hypothetical location north of the city of Enschede and backed this up by reservoir simulations. The geologic risks of the Tubbergen Formation are: lack of permeability, reservoir thickness, and lateral extent of reservoirs. In our judgment the chance of economic success for this site is 50% or more. Upside potential is present in numerous fault blocks in the study area, and in adjacent areas where suitable sandstones with similar porosity and permeability at greater depth and higher temperatures are expected.

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Seismic lithostratigraphy of deep subsalt Permo‐Carboniferous gas reservoirs, Northwest German Basin

Cited by 5 publications

References 6 publications

Seismically detected porous Zechstein carbonates in Southern Jutland, Denmark

Seismically detected porous Zechstein carbonates in Southern Jutland, Denmark

POROSITY EVALUATION OF SEISMICALLY‐RESOLVED ZECHSTEIN CARBONATE LAYERS, LøGUMKLOSTER‐1 WELL, DENMARK

Geothermal potential of the Tubbergen Formation in the Twente region of east Netherlands

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