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E-220 - Seismic & Sequence Stratigraphy for Oil & Gas Exploration

10 days BAS/STRATADV
Level
Advanced
Audience
  • Geologists, geophysicists, production managers and engineers involved in exploration or reservoir characterization
Purpose
  • To provide, through daily practical exercises and an integrated project, a thorough and very practical understanding of seismic and sequence stratigraphy for oil and gas exploration
Learning Objectives
  • To understand the use of sequence stratigraphy as a tool in basin exploration, and describe related workflow structure
  • To ensure accurate stratigraphic breakdown of well data
  • To manipulate and use a full dataset in an integrated project: well logs, biostrat information, and 2D lines
Ways and means
  • The most important elements in this process are: accurate stratigraphic breakdown of well database and stratigraphic data loading both into the well and the seismic databases

Sequence stratigraphy concepts and method
  • Shelfal accommodation space. Tectonic, eustatic and sediment control on the stratal and facies stacking pattern of depositional sequences
  • Practical palaeontology
  • Establishment of a chronostratigraphic framework to support well and seismic correlation
  • Precise definitions of palaeo-environments and water depths in order to predict reservoir facies
Well log and seismic responses of lowstand systems tracts
  • LST sequence boundaries, slope fans, basin floor fans and prograding complexes
  • TST & HST basin starvation, source rock and reservoir seal
  • Biostratigraphic signature of lowstand versus transgressive / highstand systems tracts
  • Hierarchy of stratigraphic cycles
Well log/seismic responses of neritic systems tracts
  • LST sequence boundaries, incised valley and lowstand prograding complex
  • TST & HST stratal and facies stacking pattern
  • HST alluvial, deltaic, shoreline complexes and shelf sands
  • Biostratigraphic signature of transgressive and highstand systems tracts
  • Relationship of stratigraphic patterns to changes in subsidence rates as driven by regional and earth scale tectonic processes
Well log/seismic responses of neritic systems tracts (alluvial plain to delta front)
  • LST sequence boundaries, incised valleys, major unconformities and prograding complexes
  • TST incised valley fill, shelfal aggradation
  • HST alluvial, deltaic, shoreline complexes
  • Stratal and facies stacking pattern in the alluvial plain
  • Forestepping sequences and major unconformities as driven by regional and earth scale tectonic processes
Well log/seismic responses of neritic systems tracts (siliciclastic shelf)
  • LST sequence boundaries, incised valleys, major unconformities and prograding complexes
  • TST in shelfal environment (log-to-core scale)
  • HST in shelfal environment (log-to-core scale)
  • Stratal and facies stacking pattern in a siliciclastic shelfal system
  • Biostratigraphic signature
  • Hierarchy of stratigraphic cycles
  • Exploration & production consequences and related strategies
Data integration
  • Interpretation of a set of wire line logs covering the Mesozoic-Cenozoic succession to tie
  • Transgressive / regressive facies cycles and unconformity surfaces. A quantitative paleontological datasets is used to aid in determining maximum flooding surfaces, peak transgression and unconformities
  • Interpretation of a regional basin-scale seismic lines tied to the wells. Mapping of various potential reservoir intervals
  • Data integration: Exploration & Production consequences and related strategies