What does a neutron density log measure?
In density logs, which measure electron density and transform it into bulk density, porosity is calculated by assuming the matrix density and fluid density. Neutron log measures the ratio of count rate from the rock, which is equivalent to how much hydrogen index it has.
What is bulk density log?
The density log is based on gamma ray scattering as a function of the bulk density of the irradiated matrix. The bulk density is the overall density of the matrix and the fluids (water, oil, gas) within the pores.
How does formation density log works?
A density-logging tool sends gamma rays into a formation and detects those that are scattered back. Typical logging sondes use a Cesium-137 source, which emits gamma rays of 0.66MeV. At this high energy level, Compton scattering dominates.
What is the density of a neutron?
=2.90×1017⋅kg⋅m−3 , which is fairly dense…….but then we expected it to be for a fundamental massive particle.
What is formation bulk density?
The formation bulk density is an essential parameter required for geomechanical analysis and reservoir characterization. Accurate knowledge of formation bulk density is required in planning the position of a new producing or injecting well.
Why double detector is used in density log?
To overcome the problems of mudcake and hole irregularities, the new compensated formation density logging device employs two detectors spaced at different intervals from the source. The detector at the shorter spacing is particularly sensitive to the density of material immediately adjacent to the face of the pad.
Which type of tools can be used to measure the density of the formation fluid at different depths?
Clarification: Nuclear Fluid Densimeter can be used to measure the density of the formation fluid. This Nuclear Fluid Densimeter logging tool uses a radioactive source and a detector.
What does a well log tell you?
Well logs present a concise, detailed plot of formation parameters versus depth. From these plots, interpreters can identify lithologies, differentiate between porous and nonporous rock and quickly recognize pay zones in subsurface formations.
What is a lithology log?
1. An example lithologic log is included in Attachment A. Name of Sediment or Rock – In naming unconsolidated sediments, the logger shall describe the grain size, distribution, color, and moisture content, and determine the presence of fill materials.
What is lithology in oil and gas?
Lithology is different, indicating the differences in the mineral composition, organic matter content, brittleness index and other relevant parameters. These parameters play a crucial role in the prediction and calculation of the amount of resources in the late shale oil and gas favorable area.