(PESIA) Weg naar Zee 2D Seismic - Staatsolie

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P-all consultants Figure 5 Geology of the study area Legend Figure 5 Era – Deposition Date Material Formation phase Holocene – Wanica phase 6,000-3,500 yrs BP* Marine clay and fine sand Coronie Moleson phase 2,500-1,300 yrs BP Marine clay and fine to Formation medium (shell) sand Comowine phase 1,000 – present Marine clay and fine (shell) sand BP: Before Present The recent deposits of the Comowine phase are found to the north, those of the Moleson phase in the middle and the ones of the Wanica phase in the south of the study area. The seismic lines are projected in the Comowine and Moleson phase. 4.2.5 GEO-HYDROLOGY Staatsolie Maatschappij Suriname N.V. PESIA Weg naar Zee 2D Seismic 2012 The Coastal Plain of Suriname is formed on sediments that have been deposited since the Late Cretaceous. The sediments are known as the Corantijn Group. Drinking water is withdrawn from three major aquifers within this Corantijn Group: the AA-Sand A aquifer, the Coesewijne aquifer and the Zanderij aquifer, found in the formations of th the th same respective names (note: the A-Sand Sand Formation in which the aquifer is found has been renamed Burnside Formation; Wong, 1989). 38
P-all consultants Staatsolie Maatschappij Suriname N.V. PESIA Weg naar Zee 2D Seismic 2012 Table 5 Stratigraphy of the Corantijn Group According to Noordam and Teunissen the Zanderij aquifer, at 30-70 m, is not being used for drinking water supply in the Weg naar Zee area, because the water is brackish. They also state that the Coesewijne and A-Sand aquifers consist of non-consolidated and consolidated clastic sediments of clay, sandy clay, and coarse-grained sandstone. Depth to the Coesewijne aquifer ranges from 70 to 110 meters and depth to the A-Sand aquifers ranges up to 180 meters. For the study area fresh water is only available in the southwestern part. Drinking water stations withdraw water from the Coesewijne and A-Sand aquifers south of the study area (Former Landsboerderij-Leysweg, Uitkijk and Zorg en Hoop). Saline water zones underlie the fresh water zones in the coastal area and caution should be exercised while pumping to prevent saline water intrusion. 39
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(PESIA) Weg naar Zee 2D Seismic - Staatsolie

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