Geophysical Wireline Well Logging
Hydrogeological units have the ability to store and transmit incredible amounts of fluids form both confined and unconfined aquifers regionally. This makes it essential to understand that a borehole represents an access point to our ground-water system. Creating a critical need to learn what we can of the construction and condition of boreholes regardless if the intended use is for supply, monitoring, or remediation. Due to the highly variable sedimentological sequences within the Mississippi Embayment, observations indicate a related variability of ground-water quality and transmission rates of contaminants, further demonstrating the need to acquire borehole data.
Borehole-geophysical logging provides a highly efficient means to determine the character and thickness of the different geologic materials penetrated by wells and test holes. This information is essential for proper placement of casing and screens in water-supply wells and for characterizing and remediating ground-water contamination.
Borehole-geophysical logging can provide a wealth of information that is critical in gaining a better understanding of subsurface conditions needed for ground-water and environmental studies of open and cased boreholes. It is beneficial to the engineer to know that geophysical logs provide unbiased continuous and in-situ data and generally sample a larger volume than drilling samples, with tremendous vertical resolution.
When combined with driller’s logs and geological sampling, the integration of borehole-geophysical logging along with water-quality sampling will provide a more complete picture, whether the objective is to develop a water-supply well or remediate a contaminated aquifer.