The density log measures the electron density of a formation. General ... the log porosity is less than the actual porosity. This course assumes no knowledge of petrophysical measurements and interpretation and considers the common openhole logs that are used to determine porosity, lithology, and fluid saturation.

If the actual lithology is dolomite, the log porosity … 22.5 PTTC Instructional Hours. The flow charts included in this chapter (Figures 7.1 and 7.2) will help you review the steps used in log interpretation and will also provide an index of where different pieces of information are located. The most common methods for estimating shale volumes from gamma ray and SP logs are outlined here. Log-derived data can be used to estimate permeability of a formation, but only if the formation is at irreducible water saturation.

Romeo M. Flores, in Coal and Coalbed Gas, 2014.

• Interpretation goals – Porosity – Lithology identification (from PEF and/or with Sonic and/or ... calibrated in basic physical units.

before proceeding with a study of log interpretation. Emitted gamma rays collide with formation electrons and scatter. BASIC OPENHOLE LOG INTERPRETATION (BOLI) April 20, 21, & 22. Density Log.

The Defining Series: Basic Well Log Interpretation ... Neutron porosity tools measure the HI, which is then converted to neutron porosity. Therefore, specific logs need to be interpreted with specific charts.

The sonic log may be used to determine porosity by charting the speed of a compressional sound wave as it travels through the formation. The number of returning gamma rays is an indicator of formation bulk density. The logging device is a contact tool that emits gamma rays from a source. It is represented as a decimal fraction or as a percentage and is usually represented by the Greek letter phi,φ. The volume of shale (Vsh) is best estimated by logging measurements that respond primarily to shale, in particular, gamma ray and spontaneous potential (SP). A detector, located a fixed distance from the tool source, counts the number of returning gamma rays. Porosity Porosity can be defined as the ratio of voids to the total volume of rock. $975 USD.