--> ABSTRACT: Cenomanian-Turonian Carbonate Reservoirs of Guerguett-El-Kihal, A New Discovery in the Southeast Constantine Basin, Algeria, by A. M. Dokka, N. Guellati, A. Hamel; #91003 (1990).

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ABSTRACT: Cenomanian-Turonian Carbonate Reservoirs of Guerguett-El-Kihal, A New Discovery in the Southeast Constantine Basin, Algeria

A. M. Dokka, N. Guellati, A. Hamel

Guerguett-el-Kihal is located on the marginal zone of the Saharian flexure in the Southeast Constantine basin. Recent discovery of oil in the carbonate reservoirs is of great importance to the explorationist in view of its depositional setting.

With a net pay thickness of 115 m, the reservoirs have been considered Cenomanian-Turonian in age. Sedimentological studies have been done using well cuttings, cores, and the relevant data on this and adjacent wells.

The Cenomanian reservoir that forms a major part of the Southeast Constantine basin is represented by biomicrites ranging from mudstone to packstone with peloidal structure.

Planktonic and rarely benthic and agglutinated foraminifers, fragments of echinoderms, inocerams, oysters, and rudists represent the common faunal assemblages. Vertical and lateral lithologic variations in the sequence indicate that these carbonates may be attributed to rudistid reef-outer platform depositional belt.

The Turonian carbonates, showing depositional textures similar to the Cenomanian, contain predominating planktonic foraminifers, caldispheres, filaments, and no rudists. The carbonates might have been deposited in the outer platform belt.

Results of the geochemical analyses show the presence of a number of layers capable of generating hydrocarbons in this stratigraphic sequence.

The reservoir characteristics of these carbonates appear to be due mainly to interparticle (matrix) porespaces and fractures. However, dissolution phenomena may be noted, and some layers show dolomitization with intercrystalline organic matter.

This new discovery, along with those of the Djebel Onk in the Conaisian rudistic carbonates and Ras-Toumb in the Turonian rudistid dolomitized carbonates, make this basin very attractive for petroleum exploration.

AAPG Search and Discovery Article #91003©1990 AAPG Annual Convention, San Francisco, California, June 3-6, 1990