The Ngatoro Field in Taranaki, New Zealand has been producing for (9) nine years. Currently the field is producing 1000 bopd from 7 wells at 3 surface locations down from a peak of over 1500 bopd. The field has been analysed using new techniques in 3D seismic imaging to locate by-passed oil, and identify undrained pools. Three questions define the objectives of the study:

  1. Can we image reservoir pools in a complex stratigraphic and structural environment where conventional grid-based interpretation is not applicable due to lack of lateral continuity in reservoir properties?

  2. Can we distinguish fluids within each reservoir pools?

  3. Can extrapolate reservoir parameters observed at drilled locations to the entire field using 3D seismic data to build a 3D reservoir model?

This case study illustrates how 3D generalised inversion of seismic facies for reservoir parameters can be successfully applied to image and laterally predict reservoir parameters in laterally discontinuous turbidite depositional environment where hydrocarbon pools are located in complex combined stratigraphic-structural traps. Such conditions mean that structural mapping is inadequate to define traps and to estimate reserves in place. Conventional seismic amplitude analysis has been used to aid definition but is not sufficient to guarantee presence of economic hydrocarbons in potential reservoir pools.

Using new 3D seismic attributes such as bright spot indicators, attenuation and edge enhancing volumes coupled with 6 AVO (Amplitude Versus Offset) volumes integrated into a single class cube of reservoir properties, made the mapping of reservoir pools possible over the entire data set. In addition, 4 fluid types, as observed in more than 20 reservoir pools were validated by final inverted results to allow lateral prediction of fluid contents in un-drilled reservoir targets.

Well production data and 3D seismic inverted volume were later integrated to build a 3D reservoir model to support updated volumetrics reserves computation and to define additional targets for exploration drilling.

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