Sequence Stratigraphy

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Understanding basin chronostratigraphy

Since its conception in the mid-1970s, sequence stratigraphy has become an important technique in understanding basin chronostratigraphy. The recognition of sequences on seismic data leads to a better understanding of facies distribution which in turn leads to more accurate basin models, making the prediction of criteria required for hydrocarbon entrapment, such as reservoir, seal, source and migration pathway, more realistic and dependable.

Robertson biostratigraphy specialists have applied the principles of sequence stratigraphy to many sedimentary basins worldwide with the following objectives:

  • Identification of regional sequence boundaries from seismic data and well logs in conjunction with biostratigraphic calibrations
  • Integration of quantitative biodata to enable recognition of systems tracts and maximum flooding surfaces within sequences/parasequences
  • Biostratigraphic definition of the age range of each sequence identified

This is combined with expertise in other Robertson specialists to determine:

  • Definition of systems tracts from detailed seismic interpretation and well log analysis
  • Palaeo-water depth interpretation within each sequence, to provide detailed rock-based models of sediment distribution patterns within each given sequence
  • Identification of the interplay of eustasy, subsidence rate, uplift rate in source terrain and sediment supply to account for sediment 'accommodation rates' within the basin
  • Presentation of integrated play concepts which allow the identification of exploration play fairways, including type, geometry and spatial distribution.

While biostratigraphy plays a key role in this procedure, Robertson's facility to conduct detailed seismic interpretation and reservoir geology/sedimentology enables a fully integrated multidisciplinary approach to basin modelling.

GeoConsulting - Biostratigraphy

Biostratigraphy

Wellsite and routine stratigraphic services (micropalaeontology, palynology and nannofossils), high resolution reservoir stratigraphy, sequence stratigraphic evaluation and more.

GeoConsulting - Biosteering

Biosteering

Assisting in the positioning of the well at the optimum reservoir level and enabling recognition of (and correction for) faulting and/or unanticipated changes in stratal dip.

GeoConsulting - Wellsite Biostratigraphy

Wellsite Biostratigraphy

Monitoring the stratigraphic progress of wells, assisting in setting casing points and monitoring coring programmes.