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Papers by Qase Dizayee
structure have hydrocarbon accumulations in Tertiary and cretaceous reservoir strata. Fractures are thought to
provide the most important permeability in the field, and the lack of oriented fracture data hampers the ability to
model fracture permeability within the reservoirs. To west of Bai Hassan is the Qara Chauq structure. There are
strong similarities between Qara Chauq and Bai Hassan, including
(i) The exposed strata at Qara Chauq are thought to be the same as the reservoir units at Bai Hassan, and
(ii) Both are elongate sigmoidal anticlines.
The lack of available subsurface data to constrain the fracture patterns at Bai Hassan led to the idea that analysis
of the surface exposure of reservoir analog strata at Qara Chauq might provide insight into the fractures present at
reservoir depths in Bai Hassan field. The purpose of the project described here is to generate a conceptual fracture
model applicable to the Bai Hassan field using the most appropriate available data. Having generated this model, the
goal is to provide a protocol for applying numerical results from the analysis to reservoir simulations of Bai Hassan
field. Fieldwork and aerial photo data sets that been used as an interpretation base for fractures exposed around
Qara Chauq. Although time constraints precluded mapping the entire visible fracture population, representative
structural positions were targeted to produce an interpretable data set in a timely fashion.
field occupies a stratigraphically complex area comprising multiple facies developments of a complicated digenetic
history. Abundant and variable porosity and permeability exist which, although primarily lithology dependent, are
enormously enhanced by the development of intensive faults, fractures and joints, this combination ofuncommonly
high porosity and permeability gives rise to enormously high and continuous production.
The initial petrophysical interpretation consisted of a two-phase workflow. The first interpretation phase consisted
of calculating both the dry mineral volumes such as calcite and dolomite and the total porosity using a matrix solution
procedure. For a full suite of lithology and porosity, measurements (gamma ray, sonic, density, and neutron) up to four
mineral components plus porosity were calculated. If fewer measurements were available, simpler lithology models
were employed. Standard lithology models were set up for the observed assemblages of rock types. For example,
models for the calcite-dolomite-anhydrite-porosity assemblage and the dolomite-calcite-clay-porosity assemblage
were set up. When available, core data were used to check the interpretation model results and to adjust the model.
The second interpretation phase calculated the water saturation using the Archie water saturation equation.
Drafts by Qase Dizayee
structure have hydrocarbon accumulations in Tertiary and cretaceous reservoir strata. Fractures are thought to
provide the most important permeability in the field, and the lack of oriented fracture data hampers the ability to
model fracture permeability within the reservoirs. To west of Bai Hassan is the Qara Chauq structure. There are
strong similarities between Qara Chauq and Bai Hassan, including
(i) The exposed strata at Qara Chauq are thought to be the same as the reservoir units at Bai Hassan, and
(ii) Both are elongate sigmoidal anticlines.
The lack of available subsurface data to constrain the fracture patterns at Bai Hassan led to the idea that analysis
of the surface exposure of reservoir analog strata at Qara Chauq might provide insight into the fractures present at
reservoir depths in Bai Hassan field. The purpose of the project described here is to generate a conceptual fracture
model applicable to the Bai Hassan field using the most appropriate available data. Having generated this model, the
goal is to provide a protocol for applying numerical results from the analysis to reservoir simulations of Bai Hassan
field. Fieldwork and aerial photo data sets that been used as an interpretation base for fractures exposed around
Qara Chauq. Although time constraints precluded mapping the entire visible fracture population, representative
structural positions were targeted to produce an interpretable data set in a timely fashion.
field occupies a stratigraphically complex area comprising multiple facies developments of a complicated digenetic
history. Abundant and variable porosity and permeability exist which, although primarily lithology dependent, are
enormously enhanced by the development of intensive faults, fractures and joints, this combination ofuncommonly
high porosity and permeability gives rise to enormously high and continuous production.
The initial petrophysical interpretation consisted of a two-phase workflow. The first interpretation phase consisted
of calculating both the dry mineral volumes such as calcite and dolomite and the total porosity using a matrix solution
procedure. For a full suite of lithology and porosity, measurements (gamma ray, sonic, density, and neutron) up to four
mineral components plus porosity were calculated. If fewer measurements were available, simpler lithology models
were employed. Standard lithology models were set up for the observed assemblages of rock types. For example,
models for the calcite-dolomite-anhydrite-porosity assemblage and the dolomite-calcite-clay-porosity assemblage
were set up. When available, core data were used to check the interpretation model results and to adjust the model.
The second interpretation phase calculated the water saturation using the Archie water saturation equation.