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downhole geochemical logging Downhole Geochemical Logging This application uses proprietary Amplified Geochemical Imaging SM 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 C 2 to C 20 at part per billion (PPB) levels and may be the only technique to deliver hydrocarbon data on cutting samples from C 6 – C 15 . The C 2 to C 20 hydrocarbon range is significantly more expansive than the limited traditional ranges of C 1 – C 5 from mud logs or C 1 – C 9 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 Identification The 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 Integrity Additionally, 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. Depth of Sample (ft from surface) 2000 1000 Mass (ng) Mass (ng) Gas Range Oil Range 500 1,000 1,500 2,000 2,500 Depth (feet) 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 Response C2 C5 Oil Well C7 C10 C15 Response

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Page 1: Downhole Geochemical Logging · downhole geochemical logging Downhole Geochemical Logging This application uses proprietary Amplified Geochemical Imaging SM technology to directly

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

Page 2: Downhole Geochemical Logging · downhole geochemical logging Downhole Geochemical Logging This application uses proprietary Amplified Geochemical Imaging SM technology to directly

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: [email protected]

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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