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| Reservoir Rock |
PRELIMINARY
Petroleum = è Petro = rock, Oleum =
oil = è existing oil in the rock (the reservoir rock)
Petroleum (crude oil) is hydrocarbons (HK) compound that occurs in nature can be solid, liquid or gas
depending on the composition, pressure and temperature influence.
How / processes occurrence / gas
formation can be divided into two theories:
1) Theory of Organic
2) Theory of
Inorganic
Organic Theory: Petroleum derived
from organic remains
plants and animals that lived
millions of years ago, is deposited and the pressure
temperature and length of time then
turned into
crude oil (petroleum)
Inorganic Theory: Petroleum derived
from compounds
inorganic.
Oil and gas reservoirs is the
accumulation of oil and or gas. 1.Elemennya are: a. Parent rocks (source) b. Migration
Paths c. Reservoir rock (porous & amp; permeable) d. Hood rocks
(impermeable) e. Trap 2. The process is: a. Generation b. Migration c.
Accumulation d. preservation
Various traps oil / gas:
Physical Properties of Rocks
Reservoir
1.-Porosity
2.-Saturation
3.-Permeability
4 -.- Compresibilitas
5.-Wettabilitas
6.-Pressure Capillary
7.-D .L.L
Porosity
Definition: Porosity is the ratio
between the pore volume to the total volume of rock, symbol (φ), the units (%
or fraction)
Porosity indicates how much space the
pore / cavity in the rock that can be occupied by the fluid (oil / gas / water)
Rock porosity can be obtained from:
1.Analisa core (rock samples)
laboratory
2.Analisa logs from the logging == è
Ratings formation
Porosity measurements in the laboratory
Measurements carried out on samples
of rock (core sample)
Were measured: 1. Bulk volume (total
rock volume) === è Vb 2. Matrix Volume (grain volume) ===== è Vg 3. Pore Volume
(pore volume) ========= è Vp To calculate the porosity, the second of the above
three parameters must be known
DETERMINATION OF TOTAL VOLUME ROCK
1.Pengukuran directly (Direct
calculation)
2.Fluid displacement methods: *
Gravimetric * Volumetric
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