Integrated
Reservoir Characterization of A Carbonate Reservoir, Lumanda Field, China
Zhang, Ran1, Xiangguang Su2 (1) University of Houston, Houston, TX (2) Daqing Oil Company, Daqig, HLJ, China
Lumanda field is a
Carboniferous carbonate buildup in China where the reservoir is
formed in a variety of marine environments ranging from tidal flats to reefs.
The original texture and porosity of the reservoir carbonates are highly
variable depending on the depositional environments. Vuggy
porosity, caused by acidic hydrothermal fluids that migrated upward along the
fractures and were baffled beneath overlying shales,
constitutes the primary reservoir. Data used in the study include logs, cores,
and 3-D acoustic impedance values from inversion of seismic data. Outcrop
studies have also been used to understand the performance of this reservoir,
which can provide stratigraphic and sedimentologic information at much higher resolution. The
sequence-stratigraphic interpretation served as input
for multiple iterative seismic inversions and provided the framework for the
integrated 3-D geologic model.
Reservoir modeling demonstrated that the
potential lateral barriers to flow are present as a result of petrophysical differences. The reservoir pressure
differential that exists in the field is attributed to the presence of the
faults. The 3-D geologic model was used as a stratigraphic
framework for reservoir simulation and in the design of an improved hydrocarbon
production strategy.