gimana ya kalau misalnya saya punya tabung ...terus saya isi dengan
gas.....kemudian saya ukur neutronnya...
kemudian saya isi gas terus dan terus dan terus sampai penuh (sampai gasnya
terkompres dan jadi liquid )
ada enggak ya posibility bahwa pembacaan neutronnya akan seperti water
walaupun sebenarnya isinya gas yang termampatkan....
Regards
Kartiko-Samodro
Telp : 3852
|---------+---------------------------->
| | Shofiyuddin |
| | <[EMAIL PROTECTED]|
| | l.com> |
| | |
| | 17/12/2005 01:33 |
| | AM |
| | Please respond to|
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| Subject: Re: [iagi-net-l] kalau gas kenapa ke kanan ya...?
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Mohon hati hati juga pak Bambang dengan neutron ini. Kalau formasinya
clean,
reservoir yang mengandung gas akan memperlihatkan adanya cross over
density-neutron, semakin besar cross overnya semakin "dry" gas nya. Tapi
kalo formasinya shaley, neutron tidak harus lari ke kanan banget dan
seringkali tidak ada cross overnya, cuma saling mendekat saja (asumsi
skalanya limestone compatible). Kalo case yang terakhir ini seringkali
sulit
membedakan apakah minyak atawa gas.
On 12/13/05, Bambang Murti <[EMAIL PROTECTED]> wrote:
>
> Ferdi,
> Yang dibaca oleh tool "neutron" kan jumlah kerapatan / konsentrasi H+.
> Dalam gas (misalnya metana) memang buanyak H+ nya, tetapi masih juauhhhh
> lebih banyak di air dan di minyak, makanya di zona gas, pembacaan
> neutron akan bergeser kekanan, alias mengecil.
> Ini artian relatif lho....relatif "dong" dan relatif "kurang dong"....
> he he he ...
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, December 13, 2005 4:14 PM
> To: [email protected]
> Subject: [iagi-net-l] kalau gas kenapa ke kanan ya...?
>
> Kalau formasi terisi gas kenapa neutronnya malah mengecil ya alias
> bergeser
> ke kanan bergeser ke kanan...?
> padahal gas kan juga banyak mengandung gugus hidrogen mis : ch4
>
> Regards
>
> Kartiko-Samodro
> Telp : 3852
> ------------------------------------------------------------------------
> ------------------------------------------------------------------------
> -----------------------
>
> Arief Budiman
> Mon, 12 Dec 2005 17:49:17 -0800
>
>
> Prinsip utama yg harus difahami :
> - Neutron logging tool mengukur jumlah gugus hidrogen (hidrogen dalam
> - Density tool mengukur jumlah elektron
>
> NPHI besar karena :
> bentuk/ikatan kimia apapun, termasuk hidroksil)
> - coal memiliki gugus hidrogen banyak dari CH4
> - gugus hidrogen juga berasal dari fracture/cleat (banyak terbentuk di
> coal) yg terisi air (H2O)
>
> Rhob kecil karena :
> - Rhob sebanding dg Rhoe
> Untuk single element : Rhoe = Rhob (2*NA/BA)
> Untuk molekul : Rhoe = Rhob (2*sum NA/BM)
> Coba aja hitung Rhob nya dg memasukkan BA & NA nya coal
>
> Rhob = bulk density
> Rhoe = elektron density
> NA = Nomor atom
> BA = Berat atom
> BM = Berat molekul
>
> Umumnya (2*NA/BA) dan (2*sum NA/BM) mendekati nilai 1.0
> Jadi Rhoe mendekati Rhob
>
>
> Selamat mengulik
>
>
>
> ARIEF BUDIMAN
> Pertamina - Eksplorasi Sumatra
> Phone : (021) 350 2150 ext.1782
> Mobile : 0813 1770 4257 / (021) 70 23 73 63
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--
Salam hangat
Shofi
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