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downhole geochemical
logging
Downhole Geochemical Logging
This application uses proprietary
Amplified Geochemical ImagingSM
technology to directly characterize
the composition of hydrocarbons
vertically through various prospective
sections by analyzing well cuttings.
This technology is unique in that
it has the ability to look at a broad
compound range from C2 to C20
at part per billion (PPB) levels
and may be the only technique to
deliver hydrocarbon data on cutting
samples from C6 – C15. The C2 to C20
hydrocarbon range is significantly
more expansive than the limited
traditional ranges of C1 – C5 from
mud logs or C1 – C9 from alternate
techniques. It also separates
and quantifies approximately 80
individual compounds as opposed to
the traditional nine. The result is a
broad characterization of petroleum
phase contained in the stratigraphic
intervals down the well.
Hydrocarbon Phase IdentificationThe extensive compound list not only makes it easy to differentiate between gas, gas condensate, and oil signatures, but also provides the ability to differentiate between multiple oil signatures in fields with stacked zones in which multiple oil or gas signatures are present (e.g. the Bakken, Eagleford, or Barnett).
Compartmentalization & Seal Rock IntegrityAdditionally, the ability to differentiate between multiple hydrocarbon signatures through various vertical sections, as well as the extreme method sensitivity, provides the ability to infer compartmentalization that may not be detected by traditional well logs. As seen in this example, the unique oil signatures in these three formations imply potential compartmentalization between the three oil bearing zones.
De
pth of Sam
ple (ft from
surface)
2000 1000
Mass (ng) Mass (ng)
Gas Range Oil Range
500
1,000
1,500
2,000
2,500
Dep
th (f
eet)
Reservoir
3000 4000 8000 12000 16000
Oil
Oil
Oil
Gas
C2
C3
C4
C5 C12
Total Mass >C5
Downhole survey in Wayne County, New York State. 20 samples taken at 300 to 2,300 feet.
C2 C5
Gas Well
C7 C10 C15
Res
pons
e
C2 C5
Oil Well
C7 C10 C15
Res
pons
e
Tolu
ene
/ nC
7
3.25
3
2.75
2.5
2.25
2
1.75
1.5
1.25
1
0.75
0.5
0.25
00 0.5
nC7 / Methycyclohexane
1 1.5 2 2.5 3 3.5 4
A
B
C
D
E
A = Evaporation fractiontion B = Maturation C = Water washing D = Original oils E = Biodegradation
A = Terrestrial source B = Peat / Coal source C = Mixed source D = Marine source
Pris
tane
/ n
C17
Phytane / nC18
Biodegradation
Maturation
Reduction
Oxydation
A B CD
10
1.0
0.1
0.1 1.0 100.01
mar
ine
terrestriallacustrine
5RP
3RP 6RP
Stratigraphic CorrelationsIn areas of a field where there is little well control or where the stratigraphy may be uncertain, this technology can be used to identify the hydrocarbon fingerprint of cuttings from unknown stratigraphic sections by comparing the hydrocarbon signatures to cuttings signatures on previous wells.
For example, it is possible to differentiate oil from Bakken formation cuttings as compared to oil from Three Forks cuttings due to their different oil chemistry. This differentiation can be invaluable for completion schemes and horizontal drilling efforts when one formation is known to be more productive and
more economic than another.
Reservoir QualityThe extensive compound list, C2 to C20, also allows the data to be incorporated into geochemical interpretive charts to evaluate various reservoir or hydrocarbon properties such as thermal maturity, depositional environment, oxidation, water washing, proximity-to-pay, and biodegradation.
Bypassed PaysDue to its extreme sensitivity, PPB level detection, this application can detect bypassed zones that may be missed by conventional logging techniques and other geochemical methods. This can be particularly true in under-pressured tight sands where traditional well logs do not detect gas shows.
OverviewDrill cuttings are collected from the mud pit and placed into a module jar as the well is drilled. Cutting sampling locations can be chosen at regular intervals or more closely spaced intervals whenever a section of interest is reached. Once the collection jars are received by AGI’s laboratory, the cutting samples will be analyzed using thermal desorption followed by gas chromatography and mass spectroscopy (GC/MS). Since thermal desorption is used instead of solvent/chemical extraction techniques, the resulting chromatogram more closely resembles traditional oil fingerprints. Results are typically provided within two weeks from the time the samples arrive in the laboratory.
Top: Cuttings sample collection at the shaker table
Bottom: Controlled module exposure to cuttings (Courtesy of Merty Energy)
Amplified Geochemical Imaging, LLC210 Executive Drive, Suite 1, Newark, DE 19702, USA Phone: +1.302.266.2428, Fax: +1.302.266.2429 E-mail: info@agisurveys.net
www.agisurveys.net
Sales OfficesHouston, TX, USA: Phone: +1.281.782.8914 Germany: Phone: +49.89.638.7927.12
downhole geochemical
logging
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