Geologica Belgica

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Noël VANDENBERGHE, Michiel DUSAR, Paul Boonen, Lie Sun Fan, Rudy Voets & Jos Bouckaert

THE MERKSPLAS-BEERSE GEOTHERMAL WELL (17W265) AND THE DINANTIAN RESERVOIR

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Mots-clés : KEYWORDS: Lower Carboniferous, Dinantian, geothermics, karst reservoir, natural gas, North Belgium

Abstract

Abstract. The Merksplas-Beerse well (North Belgium) is a low-enthalpy geothermal production well targeting the Dinantian karstic limestones to a total depth of 1761 m. The presence of methane gas in these limestones generated a particular interest in this well. This paper describes the geological profile of this well and the Dinantian reservoir. The Namurian-Visean boundary at 1630 m is determined by the base of the dipmeter draping pattern in the radioactive Chokier shales (base of the Namurian) on top of the karstified Dinantian limestone. The stratigraphie composition of the transitional interval from Dinantian to Silesian correlates closely to the nearby Turnhout well. The two fractured intervals at 1630-1656 and 1739-1747 m respectively were identified in the Dinantian limestones. They are associated with siliciclastic sections in between pure limestones.

The reservoir water is a sodium chloride brine of about 74°C and at a pressure below the hydrostatic. The water is slightly radioactive because of the contact with the Chokier hot shales. A carbon dioxide gas with methane and nitrogen admixture is dissolved in the water. The gas liquid ratio at standard conditions is about one and the bubble point is around 200-400 psi at reservoir temperature. A long duration pumping test shows a high fracture permeability and a productivity index of 5.4 m3/h/bar with a productivity to injectivity ratio of 1.45.

To cite this article

Noël VANDENBERGHE, Michiel DUSAR, Paul Boonen, Lie Sun Fan, Rudy Voets & Jos Bouckaert, «THE MERKSPLAS-BEERSE GEOTHERMAL WELL (17W265) AND THE DINANTIAN RESERVOIR», Geologica Belgica [En ligne], volume 3 (2000), number 3-4, 349-367 URL : http://popups.ulg.ac.be/1374-8505/index.php?id=2236.

About: Michiel DUSAR

Geological Survey of Belgium, Jennerstraat 13, B-1000 Brussel

About: Noël VANDENBERGHE

Historische Geologie, KU Leuven, Redingenstraat 16, B-3000 Leuven

About: Paul Boonen

PathFinder Energy Services

About: Lie Sun Fan

Faninbel

About: Rudy Voets

Total FinaElf

About: Jos Bouckaert

Geological Survey of Belgium, Jennerstraat 13, B-1000 Brussel