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→Macroscopic techniques
===Macroscopic techniques===
===Macroscopic techniques===
Modern three-dimensional seismic data<ref name=pt06r17>Brown, A. R., 1986 Interpretation of three-dimensional seismic data: AAPG Memoir 42, 194 p.</ref> can sometimes assist in predicting reservoir quality away from well control. Careful processing of seismic data allows a conversion of the seismic reflection amplitudes to estimates of acoustic impedance. Because lithology, porosity, and fluid saturations affect the acoustic impedance of a rock, a relationship can then be established between the seismic estimates of impedance and the rock properties determined from the logs or in the laboratory. (For information on comparing seismic data to rock properties, see [[Seismic inversion]].)
Modern three-dimensional seismic data<ref name=pt06r17>Brown, A. R., 1986 Interpretation of three-dimensional seismic data: [http://store.aapg.org/detail.aspx?id=1025 AAPG Memoir 42], 194 p.</ref> can sometimes assist in predicting reservoir quality away from well control. Careful processing of seismic data allows a conversion of the seismic reflection amplitudes to estimates of acoustic impedance. Because lithology, porosity, and fluid saturations affect the acoustic impedance of a rock, a relationship can then be established between the seismic estimates of impedance and the rock properties determined from the logs or in the laboratory. (For information on comparing seismic data to rock properties, see [[Seismic inversion]].)
Wireline logs can be classified into three different groups based on the information they provide: (1) lithology indicators—gamma ray, sonic, density, and neutron logs, (2) porosity logs—sonic, density, and neutron logs, and (3) fluid saturation logs—resistivity logs.<ref name=pt06r6>Asquith, G., Gibson, C. 1982, Basic well log analysis for geologists: AAPG Methods in Exploration Series, 216 p.</ref> (For more on the information that wireline logs can provide, see [[Standard interpretation]].)
Wireline logs can be classified into three different groups based on the information they provide: (1) lithology indicators—gamma ray, sonic, density, and neutron logs, (2) porosity logs—sonic, density, and neutron logs, and (3) fluid saturation logs—resistivity logs.<ref name=pt06r6>Asquith, G., Gibson, C. 1982, Basic well log analysis for geologists: AAPG Methods in Exploration Series, 216 p.</ref> (For more on the information that wireline logs can provide, see [[Standard interpretation]].)