05.gamma ray log

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5MT - Oil & Gas Business Course.

Gamma Ray Log.

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Jenis NGT.

Data; Count rates, tetapi dibedakan dalam setiap energi

yang berbeda untuk mendeteksi radiasi dari K, Th dan U.

Catridge dan sonde menjadi satu.

Transmitter; tidak ada dialat. Ada di formasi, dating dari

rad ias i s inar Gamma yang ada pada batuan formas i

)K,Th dan U)

Receiver; Detektor sinar Gamma.

Hasil; rekaman Gamma Ray Total, Gamma Ray

terkoreksi, porsi K, Th dan U.

ALAT GAMMA RAY ALAT GAMMA RAY


Gamma Ray Log.

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KEGUNAAN LOG GAMMA RAY.

Mendeteksi dan mengevaluasi kandungan radioaktif.

Bisa digunakan didalam casing.

Untuk Korelasi. Menentukan kandungan clay.

MEMBACA LOG GAMMA RAY.

Ditampilkan pada lajur-1.

Skala yang dipakai adalah linier, 0-100 atau 0-150 API

Kegunaan Kegunaan Log Gamma ray.Log Gamma ray.


Gamma Ray Log.

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GR min

GR max

GR (API) 1000

50%

shale

0%

shale

100%

shale

GAMMA RAY LOG Identifikasi Batuan Reservoir

Vsh

=

minmax

min

GRGR

GRGR

−

−

Vsh = Shale volume

GR = GR log terbaca

GRmax = GR log di shale zone

GRmin = GR log di clean sand zone

GR Log:

Identifikasi Lithology

(Reservoir, Non-reservoir)

Evaluasi kandungan Vshale

Korelasi Antar sumur


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LOG GAMMA RAY (NGS).

Untuk membedakan jenis lempung yaitu Illit,

Montmorilonit dan kaolinit disamping mineral lainnya.

KOREKSI TERHADAP GR.

Chart GR-1

GAMMA RAY GAMMA RAY


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GAMMA VOLUME OF SHALE PARAMETERS GAMMA VOLUME OF SHALE PARAMETERS

For Laminated Shales*

= IGR


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What are the requirements of a caliper? What are the requirements of a caliper?

1. The Caliper should open and close when the

Engineer wishes so (by applying electrical Power

from Surface

2. When the Caliper has been opened Electrically, the

arms should b e able to close and follow the

Borehole Shape while applying sufficient pressureto the borehole wall

3. The actual mechanical position of the Arms opening

should always be converted to an Electrical signal

that can be communicated uphole to give us a

Caliper Log calibrated in inches

4. Some Safety feature should be available that will

automatically cut the Electrical Power to the Caliper

in case the arms reach their Mechanical Limits

5. A Pressure compensation mechanism should

ensure that Mud Pressure should NOT force theCaliper Open or Close


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Caliper Caliper

KEGUNAAN CALIPER.

Untuk memudahkan mel ihat apakah lubang bornya “cantikdan mulus”.

Bila cal iper menunjukkan lebih kecil dar i ukuran mata bor,berarti ada “ Mud cake” .

Bila caliper menunjukkan lebih besar dari ukuran mata bor,berati terdapat gerowong (Rugose) pada dinding lubang bor.

CALIPER LOG.

Disajikan pada track-1.

Berskala l inier dari 6” sampai 16” , bi la ukuran mata bor 8 ½”atau 10” sampai 20” ,

bila ukuran mata bor 12 ¼” sampai 17 ½” skalanya 15”samapai 25” .


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Gamma Ray Log.

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CALIPER LOGS CALIPER LOGS

• Boreholes are irregular

in shape and have

washouts

• Calipers quantify those

irregularities and therefore

help us apply suitable

corrections.

• Help calculate Borehole

Volume or (BHV)

• Hole Volume in cubic

feet/foot can be calculated

using: 0.00545 X d2

(d is in inches)


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Mud Cake

Bit Size

Caliper

The Caliper can also be usedThe Caliper can also be used

for Formation Evaluation for Formation Evaluation

Mudcake or permeability

Indicator. As in porous and

permeable sandstone

Washout indicator. As in

most Shales

When 4 arm or 6 arm

calipers are used then they

can also indicate

differences in mechanical

properties of rocks alongdifferent axes


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BHV

AHV = BHV – Casing Volume• The volume between two ti cs on the log represents 10 ft3.

A major one is 100 ft 3

• The annular hole volume is calculated based on the engineer’s

input for the casing size to be run.

BHV AHV


Gamma Ray Log.

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Gamma ray LogGamma ray Log

By Ir. Mustoto Moehadi. MM


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37.GR Log 37.GR Log


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37.GR Log 37.GR Log


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38.GR 38.GR


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38.GR 38.GR


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05.gamma ray log

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