Abstract
Formation depiction is the progression that describes both physical and chemical properties of rocks and fluids through the exploitation of available log or core data. Geologic formations are generally heterogeneous in nature. Different types of well logs like caliper, SP, resistivity, gamma, sonic, neutron, and density logs are used to characterize formations. Formation temperature (Tf), porosity (Φ), permeability (k), formation water resistivity (Rwf), formation water saturation (Sw), etc. are the main characteristics of a reservoir. In this study, a gas field located in Brahmanbaria district, Bangladesh, with latitude 24° 00′ 58.6″ N and longitude 91° 07′ 14.4″ E is examined. The geothermal temperature gradient was 0.00735 °C/m with a temperature of 43.33 °C at depth of 3535 m. Four sand zones (identified as B, D, F, and H), four shale zones (identified as A, C, E, and G), and four sand mixed with shale zones (specified as I, J, K, and L) were mapped between depth 2800 and 3557 m. The average porosities (combining sonic, neutron, and density porosities) of zones B, D, F, and H were 25.5%, 26.2%, 23.95%, and 20.65%, respectively, with permeabilities of 84.26 mD, 49.64 mD, 35.01 mD, and 296.38 mD. Considering all the parameters (porosity, permeability, resistivity, and formation water saturation), it is shown that zone H (3036–3186 m) is a more effective gas production zone.
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