DHA-7
from Geometrics

The DHA-7 downhole hydrophone array is designed for high-resolution seismic borehole imaging. Unique proprietary polymer hydrophones (no ceramics) are in-line molded to a fully integrated, triple-sealed multi-conductor cable. Non-shattering polymer material provides superior performance and durability under the rigors of borehole applications and a stable signal response up to 10 kHz.

The Model DHA-7 is suited for use in cased and uncased, water-filled, narrow-diameter boreholes. The standard configurations include a group interval of 0.5 to 5 m and a total cable length of up to 400 m (1,312 ft). The cable is terminated topside with suitable connectors to mate with the seismograph and a 12VDC rechargeable power supply. Custom group intervals and multiborehole configurations are also available to tailor the system to meet your needs. The array is easily deployed by hand.

Applications

• Image faults and fractures, stratigraphy, voids, mineral deposits, underground structures; determine soil, rock and reservoir properties
• Ideal for shallow gas and mining investigations, earthquake engineering and foundation studies, teaching and research
• Suited for high-resolution uphole, VSP, and crosshole surveys

  Features

• State-of-the-art polymer hydrophones provide superior, stable response
• Unique design isolates vibration and suppresses cable-related noise
• Small diameter and light weight make for easy deployment
• Reliably performs under the rigors of borehole applications