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The consequence of measured porosities and clay contents on P-wave AVO for shaly sandstone
The modified AVO (amplitude versus offset) equations presented in Othman (2003 Tecnologia de la Intrusión de Agua de Mar en Acuifros Costeros: Paises Mediterráneos—Coastal Acquifer Intrusion Technology: Mediterranean Countries (Madrid: IGME) pp 295–302) are confirmed by application of our data. About 26 layers composed mainly of shales and sandstones encountered in an oil well in the Gulf of Suez are utilized in the present study. P-wave velocity, density, porosity and the clay content of these rocks are principal feedback parameters in this investigation. The attributes of the assessed AVO coefficient (Ra) are studied with reference to several parameter ratios in the AVO case. These ratios include the porosity ratio (1/
2), Poisson's ratio (σ1/σ2), density ratio (ρ1/ρ2), clay content ratio (C1/C2) and P-wave velocity ratio (α1/α2). Subscripts 1 and 2 respectively refer to the upper and lower layers relative to the interface. The applied data reveal linear relationships between the velocity ratio, α1/α2, and the porosity ratio,
1/
2. α1/α2 is found to decrease with increasing
1/
2. The clay content ratio C1/C2 increases linearly with increasing
1/
2 as well as with increasing Poisson's ratio, σ1/σ2. The density ratio, ρ1/ρ2, demonstrates a weak decrease proportional to
1/
2. Ra generally increases with increasing
1/
2, C1/C2 and σ1/σ2. On the other hand, Ra decreases with increasing ρ1/ρ2 and α1/α2. These relations are valid for the offset condition according to our data.
The consequence of measured porosities and clay contents on P-wave AVO for shaly sandstone
The modified AVO (amplitude versus offset) equations presented in Othman (2003 Tecnologia de la Intrusión de Agua de Mar en Acuifros Costeros: Paises Mediterráneos—Coastal Acquifer Intrusion Technology: Mediterranean Countries (Madrid: IGME) pp 295–302) are confirmed by application of our data. About 26 layers composed mainly of shales and sandstones encountered in an oil well in the Gulf of Suez are utilized in the present study. P-wave velocity, density, porosity and the clay content of these rocks are principal feedback parameters in this investigation. The attributes of the assessed AVO coefficient (Ra) are studied with reference to several parameter ratios in the AVO case. These ratios include the porosity ratio (1/
2), Poisson's ratio (σ1/σ2), density ratio (ρ1/ρ2), clay content ratio (C1/C2) and P-wave velocity ratio (α1/α2). Subscripts 1 and 2 respectively refer to the upper and lower layers relative to the interface. The applied data reveal linear relationships between the velocity ratio, α1/α2, and the porosity ratio,
1/
2. α1/α2 is found to decrease with increasing
1/
2. The clay content ratio C1/C2 increases linearly with increasing
1/
2 as well as with increasing Poisson's ratio, σ1/σ2. The density ratio, ρ1/ρ2, demonstrates a weak decrease proportional to
1/
2. Ra generally increases with increasing
1/
2, C1/C2 and σ1/σ2. On the other hand, Ra decreases with increasing ρ1/ρ2 and α1/α2. These relations are valid for the offset condition according to our data.
The consequence of measured porosities and clay contents on P-wave AVO for shaly sandstone
The modified AVO (amplitude versus offset) equations presented in Othman (2003 Tecnologia de la Intrusión de Agua de Mar en Acuifros Costeros: Paises Mediterráneos—Coastal Acquifer Intrusion Technology: Mediterranean Countries (Madrid: IGME) pp 295–302) are confirmed by application of our data. About 26 layers composed mainly of shales and sandstones encountered in an oil well in the Gulf of Suez are utilized in the present study. P-wave velocity, density, porosity and the clay content of these rocks are principal feedback parameters in this investigation. The attributes of the assessed AVO coefficient (Ra) are studied with reference to several parameter ratios in the AVO case. These ratios include the porosity ratio (1/
2), Poisson's ratio (σ1/σ2), density ratio (ρ1/ρ2), clay content ratio (C1/C2) and P-wave velocity ratio (α1/α2). Subscripts 1 and 2 respectively refer to the upper and lower layers relative to the interface. The applied data reveal linear relationships between the velocity ratio, α1/α2, and the porosity ratio,
1/
2. α1/α2 is found to decrease with increasing
1/
2. The clay content ratio C1/C2 increases linearly with increasing
1/
2 as well as with increasing Poisson's ratio, σ1/σ2. The density ratio, ρ1/ρ2, demonstrates a weak decrease proportional to
1/
2. Ra generally increases with increasing
1/
2, C1/C2 and σ1/σ2. On the other hand, Ra decreases with increasing ρ1/ρ2 and α1/α2. These relations are valid for the offset condition according to our data.
The consequence of measured porosities and clay contents on P-wave AVO for shaly sandstone
Consequence of measured porosities and clay contents on P-wave AVO for shaly sandstone
Adel A A Othman (author)
Journal of Geophysics and Engineering ; 1 ; 287-294
2004-12-01
8 pages
Article (Journal)
Electronic Resource
English
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