Log Interpretation In The Malay Basin Available to Purchase

The reservoirs of the Malay Basin consist of very fine grained sediments with fresh to brackish formation waters. Standard shaly sand log analysis methods yield pessimistic values of porosity and water saturation when applied to these rocks. A new technique is presented for the determination of these parameters which is more consistent with core and production data. Grain size analysis of the reservoirs shows that the clay content is generally low although the silt content may be significant. Core data and log responses indicate that the porosity distribution and solids conductivity are controlled largely by the silt size particles. Under the conditions that existin the Malay Basin these silt size particles appear to behave as a specific mineral type. A sand-silt-clay-water model has been developed from the Density-Neutron crossplot and this model is used to determine the porosity and volumes of the matrix components of the rocks. The resistivity of water bearing reservoirs, Ro, is effectively constant even though the porosity can vary significantly, This constant Ro. allows the use of the Waxman-Smits saturation equation to obtain a value of solids conductivity and hence water saturation.