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.
Where is oil and gas reservoir developed?
Petroleum reservoirs are normally found in sedimentary rocks. Rarely, petroleum is found in fractured igneous or metamorphic rocks. Igneous and metamorphic rocks originate in high pressure and temperature conditions that do not favor the formation of petroleum reservoirs.
What are the methods of formation evaluation?
Formation evaluation techniques:
- Mud logging.
- Wireline logging.
- Coring.
- Drill stem testing.
- Measurement-while-drilling and logging-while-drilling.
What is the purpose of formation evaluation?
The principal objectives of formation evaluation are to evaluate the presence or absence of commercial quantities of hydrocarbons in formations penetrated by, or lying near, the wellbore and to determine the static and dynamic characteristics of productive reservoirs.
What is reservoir evaluation?
Reservoir evaluation is a method for classifying reservoirs and the description of heterogeneity quantitatively.
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.
How is an oil reservoir formed?
For a reservoir to exist, oil and gas from the source rock must migrate into the reservoir rock, which takes millions of years. This migration occurs because oil and gas are less dense than water. The rock formation must be formed or deformed in such a way to create a trap for the oil and gas.
What is an oil reservoir called?
A petroleum reservoir or oil and gas reservoir is a subsurface pool of hydrocarbons contained in porous or fractured rock formations. Petroleum reservoirs are broadly classified as conventional and unconventional reservoirs.
What do you mean by formation evaluation?
Formation evaluation is performed to assess the quantity and producibility of fluids from a reservoir. Formation evaluation guides wellsite decisions, such as placement of perforations and hydraulic fracture stages, and reservoir development and production planning.
What is unconventional reservoir?
An unconventional reservoir consists of an ultra tight source rock, trap and seal containing organic rich matter that has reached thermal maturity without migration.
What is the function of oil reservoir?
The reservoir is a place where the hydraulic oil goes to rest for a while. Contaminants that the oil has picked up settle to the bottom of the tank and form sludge, so one of the purposes of the reservoir is to help clean the oil.
What are the types of oil reservoir?
Types of Oil and Gas Reservoirs
- Porous reservoir. The storage space and percolation channels are the intergranular pores.
- Fractured reservoir. Natural fractures are not only the main storage space, but also the flow channels.
- Fracture porosity reservoir.
- Porous fractured reservoir.
- Combined fracture–vug–pore reservoir.
How are oil and gas reservoirs formed and how are they formed?
Oil and gas reservoir An oil and gas reservoiris a formation of rock in which oiland natural gashas accumulated. The oil and gas collected in small, connected pore spaces of rock and are trapped within the reservoir by adjacent and overlying, impermeable layers of rock.[1]
What are the parameters for shale gas reservoir evaluation?
Lacustrine shale gas reservoir evaluation is carried out using the following parameters: 1. The depth of marine shale gas developed by petroleum industry in the USA is generally less than 3000 m.
How are rock types used in reservoir evaluation?
Fundamental to the process of reservoir evaluation is the identification and comparison of three different rock types: (1) depositional rock types, (2) petrographic rock types, and (3) hydraulic rock types ( Rushing et al., 2008 ).
How are geological formations used in petroleum production?
Advances in technology have occurred in well logging and the evaluation of geological formations more than in any other area of petroleum production.
