WebJul 15, 1991 · This log compares core porosity, core transform porosity, and pseudocore transform porosity (with maximum and mean log10 neutron deflection vs. 0.015 and mean porosity of the core data to generate ... The density–neutron log is a combination log that simultaneously records neutron and density porosity. In some zones, porosities recorded on the logs differ for three reasons: 1. The matrix density used by the logging program to calculate porosity is different from the actual formation matrix density. 2. … See more The density log measures the electron density of a formation. The logging device is a contact tool that emits gamma rays from a source. Emitted gamma rays collide with formation … See more Lithology, porosity, fluid type, and tool type affect neutron log response. When interpreting neutron logs, use the specific log for the specific … See more Formation bulk density is a function of matrix density, porosity, and fluids contained in the pore space. Formation bulk density … See more The neutron logmainly measures hydrogen concentration in a formation. The logging device is a noncontact tool that emits neutrons from a source. Emitted neutrons collide with nuclei of the formation and lose … See more
KGS--Geological Log Analysis--Nuclear Porosity Logs
WebIn this method, it is assumed that the sonic log provides matrix porosity. The difference between neutron (or density or the combination neutron-density) and sonic porosity is interpreted as fracture porosity, if it is known that there is no other kind of secondary porosity. Figure 3 11 shows sonic, neutron, and density logs of a well in the ... WebJan 18, 2024 · Compared to oil- or water-filled sandstone, the neutron log for a gas-filled sandstone reads as much as 10–15 porosity units too low, and the density log may … drivers of asus x54c window 7 32 bit
Density Log - an overview ScienceDirect Topics
WebFor clean, shale-free formations, in which the porosity is filled with water or oil, the neutron log measures the fluid-filled porosity. Because gas has a much lower hydrogen density than oil or water, gas-filled porosity appears as low porosity. Webelastic scattering involving the neutrally charged neutron and a stationary positively charged nucleus. At each interaction (collision) the neutron looses some energy and slows down, … WebThe neutron porosity log is strongly affected by clay and gas. Hydrogen occurs in clays and hydrated minerals as well as pore fluids. Gas has a low hydrogen density, so that gas zones have a very low apparent porosity. The measurement is based on either thermal or epithermal neutron detection. Thermal neutrons have about the same energy as the ... episcopal divinity school