Clay minerals diagenesis and vitrinite reflectance analysis in Hamzeh-4 well, Azraq Basin, Jordan

Conference · Tue May 01 04:00:00 EDT 1990 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:6797205

Basim, F J ^[1]

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1. Natural Resources Authority, Suweilch (Jordan)

One hundred and ten cutting samples and ten core chips were selected for this study. The samples were chosen from the shaley and argillaceous parts of Hamzeh-4 well, Azraq basin, Jordan. This well, compared to other wells in the Hamzeh oil field is the deepest (3984 m), and contain the most complete stratigraphic section. Thin section petrography, x-ray diffraction vitrinite reflectance, scanning electron microscopy, and chemical analyses were used to investigate clay minerals diagenesis and its relationship to kerogen maturation. The main diagenetic events observed are the illitization of smectite through an intermediate stage with mixed layering of illite/smectite to illite phase. The maturity of organic matter is observed through the vitrinite reflectance. Both events correlate well beyond the onset of oil generation (0.5 %R{sub 0}) at 33,600 m depth. Weaver Index and vitrinite reflectance shows a positive correlation coefficient of 0.5933 at 90% confidence level. Expandability of mixed-layers illite/smectite decrease from approximately 90% at 200 m, to a pure illite phase at peak oil generation of 0.8 %R{sub 0} at 3,800 m depth. Vitrinite reflectance revealed the existence of a higher paleogeothermal gradient (5{degree}C/100 m) during the Ordovician to the Jurassic. A lower geothermal gradient did exist from the Early Cretaceous onward (present geothermal gradient is 2.2{degree}C/100 m). The geothermal gradient was calculated by the thermal modeling of the Hamzeh-4 well using the MATOIL computer program. Furthermore, two major unconformities were shown to exist: (1) between the Triassic and Ordovician with 2,000 m of eroded sections and (2) between the Jurassic and Lower Cretaceous, with 650 m of eroded section.

• OSTI ID: 6797205
• Report Number(s): CONF-900605--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 74:5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580000 -- Geosciences
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
ASIA
CLAYS
COHERENT SCATTERING
COMPUTER CODES
CRETACEOUS PERIOD
DEVELOPING COUNTRIES
DIFFRACTION
ELECTRON MICROSCOPY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOTHERMAL GRADIENTS
ILLITE
JORDAN
JURASSIC PERIOD
MACERALS
MATURATION
MESOZOIC ERA
MICROSCOPY
MINERAL RESOURCES
MINERALS
ORDOVICIAN PERIOD
ORGANIC MATTER
OXYGEN COMPOUNDS
PALEOZOIC ERA
PETROLEUM DEPOSITS
RESOURCES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SEDIMENTARY BASINS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SMECTITE
SOURCE ROCKS
TEMPERATURE GRADIENTS
TRIASSIC PERIOD
VITRINITE
X-RAY DIFFRACTION