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Abstract
To estimate the volume of oil and gas in the hydrocarbon reservoirs, the rock-typing must be considered. The volume and type of available space in the reservoir rocks (porosity) and the ease of hydrocarbons flow (permeability) are important in the classification of rock-types. In the field study, touching-vug Porosities (intergranular, intercrystalline and brecciate) increase the total porosity and form high quality rock-types, on the other side, separated-vug porosities (such as moldic, intraparticle and vuggy) increase the total porosity but do not play a large role in the production of hydrocarbon. In this paper, based on the SCAL data (Special Core Analysis) and according to amount of irreducible water saturation (Swir) and capillary pressure, the reservoir rocks are divided into 4 classes including Reservoir Rock-Types 1 to Reservoir Rock-Types 4 (RRTs-1 to RRTs-4). By study of the prepared thin sections, we investigated the role of porosity in the rock-typing. Among the rock-types, category 1 is the best type-reservoir and category 4 is non-reservoir. Probably, the latest diagenetic process determines the quality rocks, not sedimentary environments.
Highlights
Materials and Methods554 thin sections (approximately one thin section per 30 cm.) gamma and sonic logs have been studied
Depositional and diagenetic processes control the fluid movement and its saturation behavior by forming pores and changing them in the reservoir rocks [1]
It seems that study of reservoir rock type helps for more hydrocarbons production in oil and gas fields
Summary
554 thin sections (approximately one thin section per 30 cm.) gamma and sonic logs have been studied. All thin sections were examined by Alizarin Red-s for separation of dolomite from calcite. For petrophysical study have been used from Special Core Analysis (SCAL data) including irreducible water saturation (Swir), capillary pressure, and permeability data. Log-plot (version 6) was utilized for drawing the litho-stratigraphic column
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