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E-150 - Wellsite Geology (Geological Logging)

  • Geologists, technicians involved with geological well-site control and/or supervision
  • Geoscientists using well geological reports
  • To provide a comprehensive understanding of how to monitor and use geological data acquired while drilling in order to characterize geological formations and reservoirs
Learning Objectives
  • To understand the role of a well site geologist
  • To grasp various techniques applied in wellsite geology and coring operations
  • To learn about various aspects of geological logging
Ways and means
  • Interactive presentations, applications on case studies, team work

Drilling parameters
  • Quick review of mechanical parameters (WOH, WOB, RPM, ROP) & hydraulic parameters (SPP, MFR, MPL, MWin & out, etc.)
Geological parameters
  • Cuttings: sampling, cleaning, analysis, description, calcimetry, lagtime, XRD, fluorescence
  • Quality and representativeness of cuttings
  • Hints on how to fill in the cutting description sheet; Main minerals and accessory minerals
  • Paleontological observations
Hydrocarbon gases
  • Physics and chemistry of gases
  • Detection & evaluation of gas shows while drilling - Chromatography - Type of dissolved gases in the mud
  • Importance of gas control on quality of measurements - Gas while drilling
Geological logging
  • Role of well site geologist: analysis and decision
  • Depth control: depth, deviation surveys, (MD, TVD, TVDSS) and stratigraphic column
  • Gathering geological and drilling information
  • Geological log: header and track presentation; main software programs
  • Drilling parameters for a geological log
  • Calcimetry, gas, gain and losses
  • Composite log: Interpretation of geological observations and descriptions for the lithology
  • Integration of other data: well tests results and logging information
  • Supervision and quality control of logging operations
  • Coring operations: core recovery, cleaning, splicing, description, fracture identification, sampling, photos
  • Final report
  • Case studies
Workshop session: case study
  • Quality control
  • Quality control of mud logs in clastics and carbonate environments
  • Practical session
  • Realization of a mud log from analysis and description of cuttings