Methods of band-equalizing seismograms

• US 3,274,542 A
• Filed: 03/25/1963
• Issued: 09/20/1966
• Est. Priority Date: 03/25/1963
• Status: Expired due to Term

• Current Assignee: Ruehle, William H.
• Original Assignee: Ruehle, William H.
• Inventors: Ruehle, William H.
• Application Number:
  US04/267,592
• Time in Patent Office: 1,275 Days
• US Class Current: 367/46
• CPC Class Codes: G01V 1/364 Seismic filtering G01V1/37 takes precedence
• CPC Class Codes: G01V 2210/20 Trace signal pre-filtering to select, remove or transform specific events or signal components, i.e. trace-in/trace-out removing noise G01V2210/32
• CPC Class Codes: G06G 7/1914 using a magnetic medium, a linear filter

Claims

4. A METHOD PRODUCING FROM SEISMIC SIGNALS GENERATED IN RESPONSE TO SEPARATE INPUT SEISMIC ENERGIES APPLIED AT DIFFERENT SHOP POINTS IMPROVED SEISMIC SIGNALS THAT WOULD BE GENERATED IF ALL WERE PRODUCED FROM A REFERENCE INPUT SEISMIC ENERGY, COMPRISING THE SEPTS OF:

(A) A GENERATING A FIST SIGNAL HAVING AN AMPLITUDE-FREQUENCY SPECTRUM BA(W) REPRESENTATIVE OF THE AMPLITUDE-FREQUENCY SPECTRUM OF ONE OF THE INPUT SEISMIC ENERGIES, (B) GENERATING A SECOND SIGNAL HAVING AN AMPLITUDE FREQUENCY SPECTRUM B'"'"''"'"'(W) REPRESENTATIVE OF THE REFERENCE INPUT SEISMIC ENERGY, (C) COMPARING SAID FIRST AND SECOND SIGNALS TO PRODUCE A FILTER WHOSE IMPULSE RESPONSE IN THE FREQUENCY DOMAIN IS CHARACTERIZED BY AN AMPLITUDE-FREQUENCY SPECTRUM OF B'"'"''"'"'(W)/BA(W), AND (D) APPLYING TO SAID FILTER THE SEISMIC SIGNAL GENERATED IN RESPONSE TO SAID ONE OF SAID INPUT SEISMIC ENERGIES TO PRODUCE AN IMPROVED SEISMIC SIGNAL.