Rock Typing and Generalization of Permeability- Porosity Relationship for an Iranian Carbonate Gas Reservoir

Abstract

Reservoir characterization methods are very important as they provide a better description of the storage and flow capacities of a hydrocarbon reservoir; moreover it plays crucial role in reservoir simulation models. Carbonate reservoirs show challenges to engineers and geologists to characterize because of their tendency to be tight and generally heterogeneous due to depositional and diagenetic processes. Among the various quantitative rock-typing techniques presented in the literature, the hydraulic flow unit method (RQI/FZI) is more widely used. 'D' is a main carbonate formation for one of the giant gas reservoir in Iran. In this study, available routine core data from four wells are assembled to develop improved generalized permeability porosity relationship for characterize 'D' formation by (HFU) concept.For this purpose, three wells are considered to develop HFU transforms for 'D' formation. Correlation accuracy of each discrete rock type (DRT) was very good (R2>0.9) for horizontal permeability. Then all data from different wells were combined to determine generalized porosity permeability relationship for 'D' formation. This transform was tested for its accuracy on available core data of fourth well which exist in the same formation. Calculated permeability data by HFU technique matched very well with the routine core data which confirm the accuracy of generalized HFU transform. In the same manner, generalized vertical permeability relationship was developed for 'D' formation and tested for its accuracy

Identification of Barriers and Productive Zones Using Reservoir Characterization

“…In the figure, unit (1,2,4,8) shows to be the speed zones that happen to have the highest flow unit speed (FUS) as shown in table 1. Unit (3,5,6,7,15,12,13,14,11,10,9) illustrates to be baffles, which happen to have high storage capacity and lower flow capacity. This well does not have a seal.…”

Characterizing Facies and Porosity-Permeability Heterogeneity in a Geothermal Carbonate Reservoir with the Use of Nmr-Wireline Logging Data

“…In the hydrocarbon industry, rock-typing is common practice in reservoir characterization in terms of predicting petrophysical and flow properties (Osorio Peralta, 2009;Shabaninejad and Bagheripour Haghighi, 2011). For many years, a number of publications have suggested carbonate rock-typing workflows (Chandra et al, 2015;Hollis et al, 2010;Kadkhodaie-Ilkhchi et al, 2013;Mathisen et al, 2001;van der Land et al, 2013) as it remains highly challenging to predict heterogeneities in such reservoirs, primarily as a result of the major influence exerted by diagenetic processes on pore network structures, and thus on the resulting petrophysical properties.…”

Rock typing based on hydraulic and electric flow units for reservoir characterization of Nubia Sandstone, southwest Sinai, Egypt

“…Flow unit concept is defined to shape the description of reservoir zones as a function of storage capacity and fluid flow capacity, which are resulted from diagenetic processes and depositional conditions. Most common use for this concept is to predict the permeability of each rock quality as can be shown in Hassan et al (2014), Shabaninejad and Bagheripour Haghighi (2011) and Al-Ajmi and Holditch (2000).…”