During the water injection development process of highly deviated wells in low-permeability
reservoirs, the water flooding distance between different layers of the same oil and water …

Borehole nuclear measurements are fundamental for the geosciences in general, and the
petroleum industry in particular. They provide a variety of well logs from which …

The fuzzy membership function is used to model the volume of investigation of well logs
geometrically. We discuss the fact that the spacing of a transmitter–receiver is not a precise …

A critical component of Formation Evaluation is the estimation of in situ petrophysical
properties and solid/fluid composition of rocks from multiple well logs and core laboratory …

Forward-modeling algorithms based on flux sensitivity functions are commonly recognized
as fast, reliable, and the most efficient way to implement inversion-based interpretation …

Neutron-activated gamma-ray (neutron-gamma) logging-while-drilling (LWD) measurements
deliver bulk density estimates without using a chemical source. The assessment of bulk …

High-angle (HA) and horizontal (HZ) wells are drilled to maximize reservoir exposure, hence
improve hydrocarbon production. Because attaining the desired well-placement targets …

Nuclear borehole instruments are ubiquitous in well logging—from bare-bones logging-
while-drilling (LWD) gamma to conventional triple-combo and more exotic neutron-gamma …

Although radioactive chemical sources have long been used in borehole nuclear tools for in-
situ porosity estimation, they pose non-negligible health, safety, and environmental risks …