Lecture 6 Density Log Pdf Gamma Ray Electron In this lecture, i explain how density logs work and how porosity can be derived when the lithology and formation fluid properties are known. The formation density log measures the bulk density of the formation. its main use is to derive a value for the total porosity of the formation. it s also useful in the detection of gas bearing formations and in the recognition of evaporites. the formation density tools are induced radiation tools.
Lecture 7 Density Log Pdf Porosity Sandstone The density of a formation is one of the most important pieces of data in formation evaluation. in the majority of the wells drilled, it is used as the primary indicator of porosity. Principles of density log returning gamma rays are measured at two different energy levels: high energy gamma rays (compton scattering) determine bulk density and therefore porosity. low energy gamma rays (due to photoelectric effect) are used to determine formation lithology. The formation density tool provides a continuous record of a formation's bulk density along the length of a borehole. it works by emitting gamma rays into the formation, which are scattered via compton scattering. · this can be demonstrated for a sandstone with a matrix density of 2.65 g cm3 and a bulk density of 2.3 g cm3. if the fluid content is incorrectly judged to be oil instead of gas, the porosity will change from about 13 to 19%, an overestimation of around 6%. [link], department of petroleum engineering, curtin university 46 f Ø density log.
Mathematical Derivation Of Density Log F Pdf Porosity Shale The formation density tool provides a continuous record of a formation's bulk density along the length of a borehole. it works by emitting gamma rays into the formation, which are scattered via compton scattering. · this can be demonstrated for a sandstone with a matrix density of 2.65 g cm3 and a bulk density of 2.3 g cm3. if the fluid content is incorrectly judged to be oil instead of gas, the porosity will change from about 13 to 19%, an overestimation of around 6%. [link], department of petroleum engineering, curtin university 46 f Ø density log. Density log with sonic log together, can be use to recognize fractures. the density tool records bulk density, and as such will include intergranular and fracture porosity. for the sonic measurement, however, the sound waves will take the quickest path from emitter to receiver. this path should avoid the fracture. source rock evaluation:. Learn advanced techniques for interpreting density logs and improving the accuracy of formation evaluation. The shallow depth of investigation characteristic of density logging tools is highlighted, along with the implications of different geological materials like shales and hydrocarbons on density readings. Formation evaluation (fe) is the process of interpreting a combination of measurements taken inside a wellbore to detect and quantify oil and gas reserves in the rock adjacent to the well. fe data can be gathered with wireline logging instruments or logging while drilling tools .
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