Sedimentological and Stratigraphic Characterisation of the Lower Miocene Reservoirs in the Matzen Field

Hernan Javier Perez Perdomo

Research output: ThesisDoctoral Thesis

Abstract

Lower Miocene sediments in the Matzen field in the Vienna basin have produced and shown good hydrocarbon potential for the past several years. The different conjugations of structural features and stratigraphic intervals, together with correspondent oil water contact(s) have been defined as individual production units; however knowledge of sediments architecture and distribution of reservoir facies in each of these production units remained challenging. This study aims to provide a three dimensional characterisation of these stratigraphic reservoir units, by incorporating available geophysical and geological data including a 3D seismic, 57 wells with log records and core data into the development of an integrated sedimentological model following a sequence stratigraphy approach. Individual environments of deposition in the Lower Miocene, from deltaic Ottnangian sediments of the Bockfliess Formation to Karpatian braided channels of the Gaenserndorf Formation were identified on core and well log data for each production unit. These depositional environments were integrated with sequence stratigraphy interpretations in order to generate a sedimentological model that explains the evolution of these sediments according to the sea level cycles. All in all, the Bockfliess Formation was deposited during a transgressive stage, shifting the coastline landwards to the southeast, resulting on fewer and thinner prograding sand packages upwards. In contrast, the overlying Gaenserndorf Formation, deposited unconformably, is represented by a braided channel system with rivers flowing from south to north. The newly developed sequence stratigraphic setting acquired an important meaning for this particular field. For instance, it shows if one or more production units are included in one single system tract or if each production unit corresponds to a separate compartment in individual system tracts; additionally defines seal stratigraphic intervals represented on transgressive system tracts. Additionally, stratigraphic surfaces interpreted on seismic data were used as trends to generate structural top and base surfaces for each production unit; which was a main achievement since seismic resolution did not allow to obtain structural surfaces to delimitate each one of these production units before. Sedimentological and stratigraphic findings determined the facies distribution of the Lower Miocene production units, determining net pay reservoir used to calculate volumes of hydrocarbon in place characterising the hydrocarbon potential on each production unit.
Translated title of the contributionSedimentologische and Stratigraphische Charakterisierung der unteren Miozän-Sedimente im Matzen Feld
Original languageEnglish
QualificationDr.mont.
Supervisors/Advisors
  • Millahn, Karl, Assessor B (internal)
  • Sachsenhofer, Reinhard, Assessor A (internal)
Publication statusPublished - 2010

Bibliographical note

no embargo

Keywords

  • Sedimentology
  • Stratigraphy

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