TITLE:
An Integrated Rock Typing Approach for Unraveling the Reservoir Heterogeneity of Tight Sands in the Whicher Range Field of Perth Basin, Western Australia
AUTHORS:
Rahim Kadkhodaie Ilkhchi, Reza Rezaee, Reza Moussavi Harami, Henrik Friis, Ali Kadkhodaie Ilkhchi
KEYWORDS:
Tight Sands, Electorofacies, Hydraulic Flow Unit, Rock Type, Reservoir Characteristics
JOURNAL NAME:
Open Journal of Geology,
Vol.4 No.8,
August
20,
2014
ABSTRACT: Tight gas sands in Whicher
Range Field of Perth Basin show large heterogeneity in reservoir
characteristics and production behavior related to depositional and diagenetic
features. Diagenetic events (compaction and cementation) have severely affected
the pore system. In order to investigate the petrophysical characteristics,
reservoir sandstone facies were correlated with core porosity and permeability
and their equivalent well log responses to describe hydraulic flow units and
electrofacies, respectively. Thus, very tight, tight, and sub-tight sands were
differentiated. To reveal the relationship between pore system properties and
depositional and diagenetic characteristics in each sand type, reservoir rock
types were extracted. The identified reservoir rock types are in fact a
reflection of internal reservoir heterogeneity related to pore system
properties. All reservoir rock types are characterized by a compacted fabric
and cemented framework. But distribution and dominance of diagenetic products
in each of them depend on primary depositional composition and texture. The
results show that reservoir rock typing based on three aspects of reservoir
sandstones (depositional properties, diagenetic features and petrophysical
characteristics) is a suitable technique for depiction of reservoir
heterogeneity, recognition of reservoir units and identifying factors
controlling reservoir quality of tight sandstones. This methodology can be used
for the other tight reservoirs.