Lower Behariya formation in the Khalda field-sedimentation, diagenesis, and reservoir properties
Khalda field is located in the northern portion of the Khalda west concession in the western desert of Egypt. Production is from the upper Cenomanian lower Bahariya Formation. The trap is established by a north-south-trending, oval, domal anticline dissected by east-west faulting. A major northeast-southwest-trending fault zone bounds the feature to the east. The lower Behariya comprises a sequence of tidal flats at the base, which pass upward through mixed flats and terminate in mud-rich flats. These are overlain by shallow marine sands and capped by the marine shales and limestones of the upper Bahariya. The whole sequence represents the action of a progressive, yet punctuated, marine transgression across a tidal flat. Facies associations, recognized from core and wireline-log data include inner shelf and mud-rich tidal-flat claystones, tidal heterolithic deposits, rippled sand-sheet/shoal complexes, cross-bedded sands, bioturbated shoal/bar complexes, lag deposits, tidal and storm channel fills, and shallow marine-shelf sheet-sand deposits. From facies correlations, an 11 zone reservoir modeling scheme has been defined. Reservoir quality, dependent on facies type, grain size, and distribution of authigenic cements, is best where rippled sand-sheet/shoal complexes and shallow-marine sheet-sands are abundant. Diagenetic modeling indicates that much of the observed porosity is secondary following carbonate dissolution and that quartz cement is the only major factor causing porosity reduction. Authigenic glauconite, found in large concentrations, together with fine laminations, controls effective permeability.
- Research Organization:
- Khalda Petroleum Co., Cairo (Egypt)
- OSTI ID:
- 5718659
- Report Number(s):
- CONF-8809346-
- Journal Information:
- AAPG Bull.; (United States), Journal Name: AAPG Bull.; (United States) Vol. 72:8; ISSN AABUD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
AFRICA
CARBONATE ROCKS
CLAYS
DEVELOPING COUNTRIES
DIAGENESIS
EGYPTIAN ARAB REPUBLIC
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC MODELS
MINERAL RESOURCES
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEDIMENTATION
SHALES