What is petrophysical evaluation?

What is petrophysical evaluation?

The petrophysical evaluation consists of estimation of the volumes of minerals and fluids present in the invaded and virgin zones. The volume of clay is first estimated using a combination of Gamma ray (GR) and Neutron-density logs.

What is reservoir evaluation?

Reservoir evaluation is a method for classifying reservoirs and the description of heterogeneity quantitatively.

What are petrophysical logs?

Petrophysical analysis of well logs is one of the most useful and important tools for reservoir rock characterization. The productivity of wells in hydrocarbon-bearing reservoirs depends on petrophysical properties which include lithology, porosity, water saturation, permeability, and saturation [1].

What are the petrophysical properties of reservoir rocks?

The most prominent features of reservoir rock are porosity, permeability, and fluid saturations. These properties related to the pore media system and its fluid distribution and flow forms.

What is reservoir evaluation in oil and gas?

Reservoir evaluation seeks to describe the spatial distribution characteristics of shale reservoir both qualitatively and quantitatively and to simulate the storage and production status of gas in shale.

What are the reservoir parameters?

Information on essential reservoir parameters – permeability, current reservoir pressure and skin factor – is vital for new wells introduction, optimization planning and field development control. Steady state regime is associated with constant rate, bottom hole pressure and productivity index.

What are the petrophysical parameters?

The petrophysical parameters mainly include total organic carbon (TOC) content, mineral components, porosity and hydrocarbon saturation, etc. So far, the estimation of water saturation in organic-rich shale gas and tight oil reservoirs is still a challenge.

What is petrophysical engineering?

The petrophysical engineer measures the acoustic, radioactive, and electrical properties of the rock-fluid system and takes samples of the rocks and well fluids to determine porosity, permeability, and fluid content in the reservoir.

What are petrophysical data?

A process or procedure used to interpret petrophysical (usually wireline log) data. Usually representing a set of equations, algorithms, or other mathematical processes, petrophysical models often have multiple routines. For example, a deterministic model might include routines that calculate. shale volume. porosity.

What are the petrophysical properties?

Petrophysics (from the Greek πέτρα, petra, “rock” and φύσις, physis, “nature”) is the study of physical and chemical rock properties and their interactions with fluids. Some of the key properties studied in petrophysics are lithology, porosity, water saturation, permeability and density.

What is the steps of reservoir rock evaluation?

Five major steps are included in the evaluation flow (Jiang et al., 2009): (1) Carry out analysis on the physical properties of cores, basic parameters of geochemistry, rock mineral composition, and the like in key wells; (2) carry out gas desorption and adsorption tests of cores in the field and calculate the …

What are the factors affecting the reservoir fluid properties?

Petroleum reservoirs may contain any of the three fluid phases—water (brine), oil, or gas. The initial distribution of phases depends on depth, temperature, pressure, composition, historical migration, type of geological trap, and reservoir heterogeneity (that is, varying rock properties).