Abstract: Applications of a 3D multilithologic stratigraphic model to the reservoir appraisal
JOSEPH, PHILIPPE, MARTINE BEZ, REMI ESCHARD, MARINA RABINEAU, DIDIER GRANJEON, and JEAN-CHRISTOPHE NAVARRE
A three dimensional stratigraphic forward model has been developed in IFP to simulate sedimentation processes in continental to marine environments (coastal plain, delta, shoreface and upper offshore). The model is based on an improved diffusion equation which simulates the average fluvial and marine transport of sand, shale and carbonate at a basin scale (tens to hundreds kilometers, hundreds of thousand to tens of million years).
The model predicts the geometry of depositional units and their internal facies distribution. It enables to quantify the evolution through time of the water depth, the thickness of the deposited and eroded sediments, and their relative content in basic lithologies (sand, shale and carbonate).
In subsurface field studies,
a first estimation of the modeling
parameters (accommodation i.e. subsidence
and eustasy, sediment supply, transport coefficients) is derived from a
quantitative analysis of well logs and
seismic
data. Then an inverse method
is used to calibrate precisely these parameters in order to fit the simulation
to the available well logs and
seismic
maps. When this match is achieved,
the
modeling
provides a full 3D distribution of facies between two
seismic
markers, taking into account the high resolution stratigraphic information
coming from the few available wells. In exploration and field appraisal,
it helps to validate the geologist's correlation sketch and to predict
the extension of reservoir units in areas far away from the wells.
The modeling
methodology will
be demonstrated on different field studies (Niger Delta, Paris and San
Juan Basins).
AAPG Search and Discovery Article #90942©1997 AAPG International Conference and Exhibition, Vienna, Austria