CHAPTER 1 NOTES Flashcards
(32 cards)
Petroleum System
Source Rock
Reservoir Rock
Seal Rock
Migration
Proper Timing
Movement of hydrocarbons from source rock to reservoir rock
Primary Migration
Movement of hydrocarbon within the reservoir rock
Secondary Migration
The _________mainly measures hydrogen concentration in a formation. The logging device
is a noncontact tool that emits neutrons from a source.
A __________ is a well logging tool that measures the bulk density of a formation, such as a
rock or coal reservoir. It’s a continuous record of the density along a borehole
neutron log
density log
Unconventional reservoir rock, porous but not permeable
Shale
Good indicator of hydrocarbon entrapment/ Good cap or seal rock
Salt dome
ratio of the pore volume to the bulk volume
vp/vb
Porosity
Formed during the rock formation. Original pore space during deposition
and compaction
Primary or integranular porosity
Formed after the post depositional processes. (Fracturing, dissolution, dolomitization)
Secondary or vuggy porosity
Limestones have low porosity but high permeabikity because tectonic forces creates ___ and ____
Fissures and fractures
There is clay content but does not affect the rock properties.
Clean sandstone
original pore spaces or void spaces formed during rock deposition (inter-granular porosity)
Primary porosity
Refers to the fraction of pore volume within a rock occupied by a specific fluid.
Saturation
There are Capillary forces acting on the water; held in place by
capillary forces connected to the grain surfaces; Can be found in smaller pore throats; This
water type is immobile.; It does not flow under normal reservoir conditions; Reduces effective
porosity and permeability of the reservoir.
Capillary bound water
Considered as movable water, not bound to the rock matrix. They are free to
move in the pore space. Low resistivity of formation when it is saline free water.
Free water
Due to the strong adherence of clay to water; significantly affects the
electric properties of the reservoir.
Clay bound water
Used to compute for permeability
Darcy equation
Proposed darcy’s law
Henry darcy
transmissibility of the fluid
*The smaller the grain size, the lower the permeability.
Fluid transmission
Presence of connected pore space
Pore throat Connectivity
Permeability types:
____ saturated with a single or those non reactive fluid
_______ fluid with the presence of ther fluids
________ ratio of effective to absolute
Absolute
Effective
Relative
