TITLE:
Porosity and Rock-Typing in Hydrocarbon Reservoirs Case Study in Upper Member of Dalan Formation in Kish Gas Field, South of Zagros, Iran
AUTHORS:
Ali-Akbar Irajian, Kamaladdin Bazargani-Guilani, Rahim Mahari, Ali Solgi
KEYWORDS:
Porosity, Rock-Typing, Hydrocarbon Reservoirs, Dalan Formation, Zagros
JOURNAL NAME:
Open Journal of Geology,
Vol.6 No.6,
June
24,
2016
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.