دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a hand tool that is powered pneumatically. 2. a chamber filled with compressed air, often used offshore in seismic exploration. As the gun is trailed behind a boat, air is released, making a low frequency popping noise, which penetrates the subsurface rock layers and is reflected by the layers. Sensitive hydrophones receive the reflections and transmit them to recording equipment on the boat.

seismic source for ocean seismic work.

n: a seismic phenomenon that shows up on a seismic, or record, section as a sound reflection that is much stronger than usual. A bright spot sometimes directly indicates natural gas in a trap. See record section.

a specific seismic reflection that may indicate gas.

n: a device trailed in an array behind a boat in offshore seismic exploration that is used to detect sound reflections, convert them to electric current. and send them through a cable to recording equipment on the boat.

a pressure sensitive receiver that transforms sound to electrical signals that may be recorded.

a computation applied to seismic data that returns reflection events (signals) to their origin in the subsurface.

a survey conducted using 3-component geophones for sensing seismic reflections in the vertical, horizontal, and crossline directions (3-C). In the marine environment, a hydrophone is included to acquire 4-component (4-C) data.

seismic energy that has traveled partly as a P-wave and then as an S-wave;having been converted on reflection at an interface.

n: the process of shortwave radiations being sent back from the earth into space in the form of long-wave radiation. The process occurs when shortwave radiation meets light-colored areas that lack absorptive qualities.