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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2014. The American Association of Petroleum Geologists. All rights reserved.
DOI: 10.1306/01131412157
Integrated charge and seal assessment in the Monagas fold and thrust belt of Venezuela
Martin Neumaier,1 Ralf Littke,2 Thomas Hantschel,3 Laurent Maerten,4 Jean-Pierre Joonnekindt,5 and Peter Kukla6
1Institute of Geology and Geochemistry of Petroleum and Coal, Energy and Mineral Resources (EMR), RWTH Aachen University, Lochnerstr. 4-20, 52056 Aachen, Germany; Schlumberger, Ritterstr. 23, 52072 Aachen, Germany; [email protected]
2Institute of Geology and Geochemistry of Petroleum and Coal, Energy and Mineral Resources (EMR), RWTH Aachen University, Lochnerstr. 4-20, 52056 Aachen, Germany; [email protected]
3Schlumberger, Ritterstr. 23, 52072 Aachen, Germany; [email protected]
4Schlumberger, 340 rue Louis Pasteur, Grabels, France; [email protected]
5Schlumberger, 340 rue Louis Pasteur, Grabels, France; [email protected]
6Geological Institute, Energy and Mineral Resources (EMR), RWTH Aachen University, Wuellnerstr. 2, 52062 Aachen, Germany; [email protected]
ABSTRACT
Conventional basin and petroleum systems modeling uses the vertical backstripping approach to describe the structural
evolution of a basin. In structurally complex regions, this is not sufficient. If lateral rock movement and faulting are inputs, the basin and petroleum systems modeling should be performed using structurally restored models. This requires a specific methodology to simulate rock stress, pore pressure, and compaction, followed by the modeling of the thermal history and the petroleum systems. We demonstrate the strength of this approach in a case study from the Monagas fold and thrust belt (Eastern Venezuela Basin). The different petroleum systems have been evaluated through geologic time within a pressure and temperature framework. Particular emphasis has been given to investigating
structural
dependencies of the petroleum systems such as the relationship between thrusting and hydrocarbon generation, dynamic structure-related migration pathways, and the general impact of deformation. We also focus on seal integrity through geologic time by using two independent methods: forward rock stress simulation and fault activity analysis. We describe the uncertainty that is introduced by replacing backstripped paleogeometry with
structural
restoration, and discuss decompaction adequacy. We have built two end-member scenarios using
structural
restoration, one assuming hydrostatic decompaction, and one neglecting it. We have quantified the impact through geologic time of both scenarios by analyzing important parameters such as rock matrix mass balance, source rock burial depth, temperature, and transformation ratio.
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