Methods and apparatus for processing well logging data

Abstract

Abstract IN ACCORDANCE WITH ILLUSTRATIVE EMBODIMENTS OF THE PRESENT INVENTION, THE PARAMETERS PRESENT IN ANY FORMATION CAN BE DETERMINED AND THEIR PERCENTAGES COMPUTED. TO ACCOMPLISH THIS, MEASUREMENTS OF THE ACOUSTIC TRAVEL TIME, HYDROGEN INDEX, AND BULK OF A FORMATION ARE OBTAINED AND USED IN A FOUR-BY-FOUR MATRIX TO DETERMINE THE PERCENTAGES OF FOUR FORMATION PARAMETERS IN A GIVEN FORMATION. SINCE THERE ARE A GREAT MANY POSSIBLE FORMATION PARAMETERS, THESE FORMATION PARAMETERS ARE ARRANGED IN MATRIX SETS WHERE EACH MATRIX SET CAN HAVE ANY POSSIBLE COMBINATION OF FOUR PARAMETERS. THESE MATRIX SETS ARE ORDERED IN ACCORDANCE WITH THEIR PROBABILITY OF OCCURRENCE IN A GIVEN FORMATION. THE PERCENT OF THE FORMATION BULK VOLUME CONTRIBUTED BY EACH PARAMETER IN THE FIRST ORDERED SET IS COMPUTED AND THESE COMPUTATIONS TESTED FOR FEASIBILITY. IF NOT FEASIBLE, THE SECOND MOST PROBABLE SET IS CONSIDERED. THIS PROCESS CONTINUES UNTIL FEASIBLE COMPUTATIONS ARE OBTAINED WHEREUPON THE COMPUTATIONS ARE RECORDED AND THE NEXT FORMATION DEPTH LEVEL IS CONSIDERED. AS AN AID IN DETERMINING THE PROBABILITY OF OCCURRENCE AND THUS THE ORDER WITH WHICH THE SETS ARE CONSIDERED, MEASUREMENTS OF ONE OR MORE FORMATION CHARACTERISTICS, INCLUDING COMPUTATIONS MADE FROM ONE OR MORE DERIVED MEASUREMENTS, CAN BE USED. D R A W I N G

Inventors

• 👤 D Tinch
• 👤 R Campbell
• 👤 E Eliahou
• 👤 A Schmidt

Bibliographic Details