--> Abstract: Computerized Texture Analysis of Borehole Electrical Images from Middle East Carbonate Reservoirs: A Contribution to Porosity Characterization, by J-P. Delhomme and R. Nurmi; #91004 (1991)
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Computerized Texture Analysis of Borehole Electrical Images from Middle East Carbonate Reservoirs: A Contribution to Previous HitPorosityNext Hit Characterization

DELHOMME, JEAN-PIERRE, Etudes et Productions Schlumberger, Clamart, France, and ROY NURMI, Schlumberger, Dubai, United Arab Emirates

Previous HitPorosityNext Hit heterogeneities have been found to be common in carbonate reservoirs and are a major factor affecting fluid flow and recovery efficiency. A review of Middle East and Indian reservoirs reveals that there are four types of heterogeneous fabrics: layered Previous HitporosityNext Hit, interwoven Previous HitporosityNext Hit, isolated Previous HitporosityNext Hit, and isolated nonporous within reservoir zones. Their presence can adversely affect the interpretation, testing, and completion of a well. Electrical imagery is a key to defining the spatial arrangement and orientation of the Previous HitporosityNext Hit distribution, or Previous HitporosityNext Hit fabric.

To assist in the interpretation and quantification of heterogeneous Previous HitporosityNext Hit, specialized image analysis techniques have been developed. Although mathematical morphology concepts developed for medical imagery are used, geological imagery has necessitated the development of some original approaches. The initial focus of the computer image analysis is of isolated Previous HitporosityNext Hit and also thin Previous HitporosityNext Hit layers alternating with nonporous carbonate rock.

The computer analysis of carbonate textures and fabrics includes the calculation of the percentage of porous and nonporous rock fractions as well as their size, arrangement, or orientation parameters specific to a given fabric. This Previous HitporosityNext Hit characterization includes the size of vugs, or patches of Previous HitporosityNext Hit, and the thickness and planarity of Previous HitporosityNext Hit layers. These results are plotted in a "Previous HitporosityNext Hit typing" summary log that facilitates comparisons and integration with other Previous HitporosityNext Hit logs, well test data, and production logging surveys.

The "Previous HitporosityNext Hit typing" summary log of the textural analysis of reservoir Previous HitporosityTop has a variety of applications, but it is an immediate input for well testing and well completion design. Moreover, as carbonate image fabrics are generally related to depositional and/or diagenetic facies, a fabric summary and zonation is also valuable for well-to-well correlation in either reservoir or exploration studies.

 

AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)