Building Conceptual Geologic Models for Complex Turbidite Reservoirs Without The Benefit of Seismic Report



The Wiriagar Deep Field in the Tangguh area — Papua has potential gas resources of up to 2 Tcf in stratigraphically complex Paleocene turbidites that are currently beyond seismic resolution. The complexity of this succession requires a robust understanding of its geology in order to appraise and develop those resources. This study was initiated to generate a range of probable conceptual geological models from the Paleocene interval; however, the inherent stratigraphic complexity, limited data base, and lack of a seismic image, all mean that a good deal of uncertainty will be inherent in the range of static and dynamic models.
In this paper we discuss the integrated approach we used to define the geological conceptual models and overcome the absence of key data, especially seismic. Our approach was based on extracting maximum information from well and core data (i.e. limited dynamic data from short well tests, high resolution biostratigraphy, ichnology, geochemistry and sedimentology) by iteratively reviewing both large and small scale information, and exploiting internal and external analogues data bases. This integrated work-flow is helping us understand and define a realistic range of geological models, and the major uncertainties associated with our model due to significant gaps in our current data base and appraisal programs to reduce the uncertainties.


Authors : Setiyo Pamungkas, Joaquin Naar & May Sari Hendrawati