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.