Abstract: As Aleisi Oilfield features in complex structure, complicated oil-water relationship, and difficult development, research is conduct on fine reservoir description, based on reinterpretation of 3D seismic data. This helps to clearly show structure and sequence of formations and deepen understandings of faults, which enables structure of major reservoirs to be completely determined. Fluid distribution model is established. Low resistivity reservoirs are discovered on the basis of new understandings of structure, deposits, and reservoirs and it enables the geological reserves of the oilfield to be determined and offers a solid basis for development plans design and scientific and reasonable development. Meanwhile, distribution of reservoir sand bodies is predicted based on reservoir inversion, providing sound foundation for the optimization of well location and drilling design. Seven vertical wells and three horizontal wells are deployed in the whole year of 2007, which leads to remarkable results. Practice shows that it is significant to conduct fine reservoir description, which can provide necessary and reliable geological bases for reasonable development of hydrocarbon reservoirs and the establishment of development strategies and technical measures.

Key words: fine reservoir description, Aleisi Oilfield, low resistivity reservoir, lower-normal and upper-reverted fracture system, borehole-seismmodulus integration technique