What is reservoir fracture?
A fractured reservoir is one in which naturally occurring fractures either have or are predicted to have a significant effect on reservoir fluid flow in the form of (1) increased reservoir permeability, (2) increased porosity, and/or (3) increased permeability anisotropy.
What is a fractured basement reservoir?
Introduction. Fractured basement reservoirs are most commonly defined as metamorphic and igneous rocks unconformably overlain by a sedimentary sequence, where faulting has led to the creation of a natural fracture network where hydrocarbons can accumulate.
What is naturally fractured reservoirs?
Naturally fractured reservoirs are different from conventional (unfractured) reservoirs. They are heterogeneous in type and consist of matrix blocks separated from one another by the fracture system as shown in Figure 7–1. The matrix blocks are made of the original rock that was present before fracturing took place.
What is a dual porosity reservoir?
1. n. [Well Testing] A rock characterized by primary porosity from original deposition and secondary porosity from some other mechanism, and in which all flow to the well effectively occurs in one porosity system, and most of the fluid is stored in the other.
What is basement reservoir?
402. Views. Fractured basement reservoir developed within the fresh basement. The fresh basement usually comprised of crystalline rocks, either metamorphic or igneous rock. This reservoir generally has fractures as its porosity to contain hydrocarbons.
What is dual porosity model?
The underlying idea of a dual-porosity model is that a fractured porous medium contains two regions with opposite characteristics, namely the fractures and the material itself.
What is dual permeability?
Dual-permeability models assume that the complete porous media system can be represented by two different interacting subsystems: the matrix and the fracture pore domain. For some soils like fractured clays, the fracture domain may be empty, which makes its physical behavior differ significantly from capillary flow.
What is basement in oil and gas?
Most workers consider basement as any metamorphic or igneous rock (regardless of age) which is unconformably overlain by a sedimentary sequence. Oil or gas may have migrated into older porous metamorphic or igneous rocks, thereby forming a basement reservoir.
Which of the following rocks is a common form of basement rock?
granite
Basement rock is the thick foundation of ancient, and oldest, metamorphic and igneous rock that forms the crust of continents, often in the form of granite.
What is dual porosity reservoir?
What are the 4 types of sedimentary rocks?
The accumulation of plant matter, such as at the bottom of a swamp, is referred to as organic sedimentation. Thus, there are 4 major types of sedimentary rocks: Clastic Sedimentary Rocks, Chemical Sedimentary Rocks, Biochemical Sedimentary Rocks, and Organic Sedimentary Rocks.
What is fractured reservoir in AAPG?
AAPG Store. A fractured reservoir is one in which naturally occurring fractures either have or are predicted to have a significant effect on reservoir fluid flow in the form of (1) increased reservoir permeability, (2) increased porosity, and/or (3) increased permeability anisotropy.
How are fractures formed in a natural reservoir?
Such fractures are formed naturally during specific geological circumstances of the reservoir history. • The presence of dispersed fractures induced by engineering stimulations does not transform a reservoir into a naturally “fractured reservoir”.
What is the best way to identify fractured reservoirs?
Determine the degree of fluid flow interaction or crossflow in either a qualitative or quantitative manner. Classify the fractured reservoir on the basis of what the fracture system provides to overall reservoir quality.
Are fractured reservoirs sensitive to changes in stress?
Naturally Fractured Reservoir Naturally fractured reservoirs are in general more sensitive to changes in stress or geomechanical behavior when fracture aperture or permeability is strongly influenced by rock deformation in fractured rock (Bagheri and Settari, 2008). From: Multiphase Fluid Flow in Porous and Fractured Reservoirs, 2016