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The AAPG/Datapages Combined Publications Database

Indonesian Petroleum Association


26th Annual Convention Proceedings (Volume 2), 1998
Pages 49-57

Radial Distribution of Previous HitApparentNext Hit Fluid Resistivities in Water Drive Reservoirs

Suparman, P. Fox, Djoko Sulistio, P. Sitorus


Previous HitResistivityNext Hit logging across carbonate reservoirs which have relatively homogeneous porosity will generally show a gradually increasing Previous HitresistivityNext Hit profile from bottom to top. If the reservoir has high permeability and the mud filtrate has a contrasting Previous HitresistivityNext Hit with respect to the formation water, the invasion of mud filtrate will induce a lateral differential Previous HitresistivityNext Hit response. In some instances the oil water contact is not clearly evident directly from the log responses. Generally we interpret the water contact level as being located in the Previous HitresistivityNext Hit response transition zone.

The High Resolution Induction (HRI#) has three Previous HitresistivityNext Hit measurements with different depths of investigation. Based on geometrical factor modeling it is possible to compute five resistivities which have average depths of investigation radially at 24 inches, 30 inches, 40 inches, 60 inches and 90 inches. By processed interpolation of the Previous HitresistivityNext Hit responses and mapping in color format, a Previous HitresistivityNext Hit image (HRIMAP#) can be created. The HRIMAP# provides characterization of the gross matrix and fluids Previous HitresistivityNext Hit responses. This is useful for graphically showing the mud filtrate invasion profile around the borehole.

These Previous HitresistivityNext Hit images can be further enhanced to provide an Previous HitapparentNext Hit fluid Previous HitresistivityNext Hit image (RWAMAP#). This is accomplished by incorporating factors which are dependent on porosity, mineral and shale contributions to the measured log responses. If this can be accurately modeled, the enhanced Previous HitresistivityNext Hit image will allow correlation to in situ fluid Previous HitresistivityNext Hit. This leads to a more precise definition of the reservoir behavior including fluid typing.

It is proposed that by studying the patterns of the Previous HitapparentNext Hit fluid Previous HitresistivityTop images a more detailed understanding of reservoir characteristics can be achieved. From response environmental correction and mud filtrate invasion effects the images may give an improved fluid type identification.

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