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Use of Molecular
Parameters
of Source Rock Extracts to Constrain 3-D Hydrocarbon Migration
Models: A Case Study from
Goncharov, Ivan V.1,
Alexander N. Gagarin1, Vadim Samoilenko1, Nikolai Oblasov1,
Benoit Erout2, Maria Saint-Germes2 (1) Tomsk Petroleum
Institute,
3D petroleum
system modeling was carried out to evaluate the processes of migration and
trapping of expelled hydrocarbon from Bazhenov formation. A case study from
central area of West-Siberian basin covering an area of 120x120 km2 is
presented. The dynamic evolution of the basin, including compaction, pressure,
temperature and HC generation was calculated through time and properties
calibrated against observed well data. In addition to the parameters usually
used like vitrinite reflectance and Tmax, different molecular parameters (MPI,
DNR, Ts\Tm, TAS, 4\1-MDBT) of source-rocks have been used to calibrate the
source-rocks thermal evolution history. These parameters allow to determinate
more precisely the heat flow lateral variations and thus the hydrocarbon
kitchen’s locations. Moreover the comparison between molecular parameters of
oils and extracts allows to define the direction of HC migration flows and
moreover to estimate the distance of migration. Results from the study show
that the local structures are filled by HC generated into various kitchens. The
qualitative and quantitative evaluation of primary and secondary hydrocarbon
migration
and entrapment led to estimations of hydrocarbon charge volume in
local trap. The results obtained were compared with resource volumes of
discovered fields. This comparison shows a good agreement between the modeled
results and real HC volumes. This analysis enhanced the understanding of the
mechanism of HC accumulation and provides a strategy for optimizing the
exploration in studied area. It also highlights the benefit of using advanced
geochemical data the calibration of petroleum system model.