Aquifers. Offshore aquifers have been identified as interesting prospects for CO2 storage with a sizeable storage potential in different parts of the Netherlands offshore sector (see Figure 4-1). These water saturated permeable rocks are present in the deep subsurface of the North Sea just to the West on the provinces of Noord- and Zuid-Holland and in the far northern part of the Netherlands North Sea sector. In many cases gas or oil reservoirs are present within these aquifers, which have been and are still being exploited. In the Independent Storage Assessment 5 high-capacity aquifers were identified (see Table 4-2; Xxxxx et al., 2012) with a total storage potential of 1,370 to 1,485 Mt. In earlier studies (Xxxxxxx et al., 2007) a few more aquifer prospects were identified (see Table 4-1) with a total estimated potential of 170 Mt; no well data are available which confirm the presence of these aquifer storage prospects. Compared to gas reservoirs, the development of aquifer stores is less advanced: • Pre-feasibility stage: A pre-feasibility study of the Lower Cretaceous Q1-aquifer has been performed during the ISA3 phase (ref.). Its CO2 storage potential is estimated at 110 to 225 Mt. • Screening stage: The larger part of the identified storage prospects is still in the screening stage. These are the Lower Cretaceous P/Q aquifer, the Upper Rotliegend L10/L13 aquifer and the Triassic Step Graben and F15/F18 aquifers with a total estimated storage potential of 1,260 Mt.
Aquifers. An aquifer is best described as an underground reservoir that is capable of providing enough water to support a well, also having the ability to transmit, store, and receive water. Auglaize, Darke and Mercer Counties are atop several layers of dolomite and limestone creating a vast carbonate aquifer. These formations can be as old as 450 million years and are covered by a glacial till layer which may date back 20,000 years. All three counties have an extensive reach of the ancestral Teays Valley, a pre- glaciation drainage pattern cut into the underlying limestone. Screened xxxxx in these areas can produce a sufficient domestic water supply of 10-25 gallons per minute (gpm). Yields in the limestone and dolomite areas can produce water supplies well over 400 gpm at depths ranging below 300 ft. At depths of 150 ft and above adequate supplies for farm and domestic use can be obtained. The Ohio Department of Natural Resources, Division of Water monitors one well in each county. The figures below depict the locations and specific information for each of those xxxxx.
