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Title: Multiple channel coincidence detector and controller for microseismic data analysis

Abstract

A multiple channel coincidence detector circuit is provided for analyzing data either in real time or recorded data on a magnetic tape during an experiment for determining location and progression of fractures in an oil field or the like while water is being injected at high pressure in wells located in the field. The circuit is based upon the utilization of a set of parity generator trees combined with monostable multivibrators to detect the occurrence of two events at any pair of channel input terminals that are within a preselected time frame and have an amplitude above a preselected magnitude. The parity generators perform an exclusive OR function in a timing circuit composed of monostable multivibrators that serve to yield an output when two events are present in the preselected time frame. Any coincidences falling outside this time frame are considered either noise or not otherwise useful in the analysis of the recorded data. Input pulses of absolute magnitude below the low-level threshold setting of a bipolar low-level threshold detector are unwanted and therefore rejected. A control output is provided for a utilization device from a coincidence hold circuit that may be used to halt a tape search unit atmore » the time of coincidence or perform other useful control functions.« less

Inventors:
 [1]
  1. (Morgantown, WV)
Publication Date:
Research Org.:
MERC
OSTI Identifier:
862702
Patent Number(s):
US 3992672
Application Number:
05/620,460
Assignee:
United States of America as represented by United States Energy (Washington, DC) NETL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
multiple; channel; coincidence; detector; controller; microseismic; data; analysis; circuit; provided; analyzing; time; recorded; magnetic; tape; experiment; determining; location; progression; fractures; oil; field; water; injected; pressure; located; based; utilization; set; parity; generator; trees; combined; monostable; multivibrators; detect; occurrence; events; pair; input; terminals; preselected; frame; amplitude; magnitude; generators; perform; exclusive; function; timing; composed; serve; yield; output; coincidences; falling; outside; considered; noise; otherwise; useful; pulses; absolute; below; low-level; threshold; setting; bipolar; unwanted; rejected; control; device; hold; halt; unit; functions; seismic data; oil field; input terminal; input terminals; data analysis; selected time; detector circuit; multiple channel; input pulse; timing circuit; time frame; hold circuit; utilization device; preselected magnitude; control functions; control function; input pulses; preselected time; magnetic tape; channel coincidence; coincidence detector; determining location; threshold detector; monostable multivibrator; level threshold; analyzing data; /327/324/

Citation Formats

Fasching, George E. Multiple channel coincidence detector and controller for microseismic data analysis. United States: N. p., 1976. Web.
Fasching, George E. Multiple channel coincidence detector and controller for microseismic data analysis. United States.
Fasching, George E. Tue . "Multiple channel coincidence detector and controller for microseismic data analysis". United States. https://www.osti.gov/servlets/purl/862702.
@article{osti_862702,
title = {Multiple channel coincidence detector and controller for microseismic data analysis},
author = {Fasching, George E.},
abstractNote = {A multiple channel coincidence detector circuit is provided for analyzing data either in real time or recorded data on a magnetic tape during an experiment for determining location and progression of fractures in an oil field or the like while water is being injected at high pressure in wells located in the field. The circuit is based upon the utilization of a set of parity generator trees combined with monostable multivibrators to detect the occurrence of two events at any pair of channel input terminals that are within a preselected time frame and have an amplitude above a preselected magnitude. The parity generators perform an exclusive OR function in a timing circuit composed of monostable multivibrators that serve to yield an output when two events are present in the preselected time frame. Any coincidences falling outside this time frame are considered either noise or not otherwise useful in the analysis of the recorded data. Input pulses of absolute magnitude below the low-level threshold setting of a bipolar low-level threshold detector are unwanted and therefore rejected. A control output is provided for a utilization device from a coincidence hold circuit that may be used to halt a tape search unit at the time of coincidence or perform other useful control functions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 16 00:00:00 EST 1976},
month = {Tue Nov 16 00:00:00 EST 1976}
}

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