GEOCLASTICA Ltd

Dr ROGER HIGGS
rogerhiggs@geoclastica.com

Consulting in Petroleum Sedimentology
& Sequence Stratigraphy

Bude, Cornwall, UK +44 7880 515748


PETROLEUM SEDIMENTOLOGY &
SEQUENCE STRATIGRAPHY FOR:


-reducing exploration & development dry-hole risk

-assessing economic viability of fields and basins


Vital economic importance

In petroleum exploration and development, incorrect interpretation of sequence stratigraphy (prediction of reservoir distribution) and depositional environment (reservoir geometry) risks huge economic losses in (A) misplaced wells, (B) missed oil and gas, and (C) phantom resources.

Techniques

  • Facies- & sequence analysis of cores, outcrops, image logs & correlation panels

  • Thin-section analysis of sandstone composition & diagenesis

Objectives

  • Interpret environments, sequence stratigraphy & depo-tectonic setting

  • Predict sand distribution at the basin scale

  • Predict undiscovered stratigraphic plays, e.g. incised valleys, lowstand fans

  • Predict sand-body geometry, size & orientation, for better placement of exploration & development wells

  • Improve basin-history models by using thin-section analysis of sandstone diagenesis to interpret number/timing of uplift events & oil charges

  • Determine sandstone porosity type & evolution, for better subsurface porosity prediction

  • Assess reservoir damage risk (swelling clays, etc.)

  • Thin-section determination of porosity & bitumen volume (immobile oil), for improved reserves calculations

  • Obtain more realistic reservoir parameters for production simulation models (geometry, dimensions, facies, porosity)

Pitfalls

Facies- or sequence analysis is not a straightforward observation or calculation, like petrophysics for example. On the contrary, it is highly interpretive and depends utterly on the sedimentologist's experience -

"The best sedimentologist is he or she who has seen the most rocks (and studied the most literature)".

For example, turbidites can easily be misinterpreted as deep-sea fan instead of shelfal if the subtle differences between unidirectional- and combined-flow cross lamination are missed in core, with profound implications for the predicted geographic distribution and volume of oil or gas.

Similarly, misinterpretation of in situ seismites as far-travelled debrites or slumps can lead to highly erroneous interpretations of depositional environment and tectonic setting, with potentially drastic financial repercussions.

Choose your sedimentologist carefully.


GEOCLASTICA LTD
Reg'd office address: 5 Breakwater Road, Bude, Cornwall EX23 8LQ, UK. Reg'd in England No 3540967

Homepage en español CV & Publications
Bude Turbidite Research Centre Facies Analysis Course
Turbidite Reservoir Analogues Lecture Outcrop Analogues Field Trips
Core & Outcrop Facies Logging Sandstone Porosity Prediction
South America Consulting Bude Geological Walks & Talks
Non-Exclusive Exploration Reports for Sale:
Trinidad Venezuela