AWWA ACE54520

Accurate evaluation of formation characteristics is a critical first step in any project that involves aquifer storage and recovery or groundwater resource development because these characteristics typically determine project viability. High-technology measurements commonly used to evaluate characteristics of hydrocarbon-bearing formations were used to assess water quality and hydraulic properties of U.S. Gulf Coast aquifers. Geophysical logging measurements, such as nuclear magnetic resonance (NMR), elemental capture spectroscopy and natural gamma ray spectrometry, were added to the standard well logging suite of induction, density, neutron and gamma ray. Combining the measurements in a petrophysical model based on published works and local knowledge provided a more accurate evaluation of permeability, pore size distribution, clay percentages, clay types and water quality. Confirmation of the results by extensive groundwater and formation sampling validated the new hydrogeological assessment technique. These expanded geophysical logging suites make it possible to assign definitive quantitative numbers to water quality and hydraulic properties. Permeability and pore size distribution are determined from the NMR log data, whereas clay types, clay percentages and water quality are determined from a combination of the other log data. Case studies for both an aquifer storage and recovery project and a groundwater resource development project are presented. Includes 20 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2001

Number of Pages:

20

File Size:

1 file , 610 KB