Itulah menariknya limestone. Adanya karsifikasi atau informasi kemungkinan
adanya karsifikasi juga membuat driller untuk menyiapkan mud lebih banyak.
Salam, mandhiri
"Indra Sumbodo"
<[EMAIL PROTECTED] To: <[email protected]>
hina.co.id>
cc:
06/03/2005 11:10 AM
Please respond to Subject: Re: [iagi-net-l]
Paleo soil di carbonate build-up
iagi-net
Tergantung kedalaman dan data dari seismic-nya. 150 ft ranging dari 30-50
ms
dan kalau bukan High Res Seismic sangat susah untuk dilihat.
Seperti Disebutkan Kars Topographic limestone sangat umum terjadi, yang
gampang dilihat seperti di Maros Sulawesi, Jawa Tengah dan Timur dll.
Untuk reefal carbonate (ataupun Carbonate) Velocity sangat variatif berbeda
dengan clastic yang lebih homogen dan predictable.
dd
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, June 03, 2005 10:49 AM
Subject: RE: [iagi-net-l] Paleo soil di carbonate build-up
>
> Mas Bambang,
> Apa dari seismic section gak kelihatan sinkhole-nya ?
> 150 ft kan lumayan ...
>
> -sw-
>
>
>
> "Bambang Murti"
> <[EMAIL PROTECTED]> To:
> <[email protected]>
>
> 06/03/2005 10:11 cc:
> AM
> Please respond to Subject: RE: [iagi-net-l]
> Paleo soil di carbonate build-up
> iagi-net
>
>
>
>
>
>
> Q,
> Depth discrepancy-nya justru terukur dari log-nya, jadi mestinya valid.
> BSM
>
> -----Original Message-----
> From: o - musakti [mailto:[EMAIL PROTECTED]
> Sent: Friday, June 03, 2005 9:50 AM
> To: [email protected]
> Subject: Re: [iagi-net-l] Paleo soil di carbonate build-up
>
> Mbang,
> Just curious, berapa tebal sih si paleosoil yang
> mengisi paleo-dolina dan paleo-sinkhole serta berapa
> besar velocity differences nya dengan si host
> carbonate sampai bisa menghasilkan depth discrepancy
> sampai 150 kaki itu....?
>
> Oki
> --- Bambang Murti <[EMAIL PROTECTED]> wrote:
>
>> Just to share.
>>
>> Salah satu client-nya kantorku (Landmark) pernah
>> meminta bantuan untuk
>> memeriksa ulang velocity model yang dipergunakan
>> oleh geophysicistnya
>> untuk melakukan time-depth conversion pada reservoir
>> yang berupa
>> carbonate build-up. Beberapa well yang dijadikan
>> acuan menunjukkan pick
>> top carbonate envelope yang konsisten tetapi begitu
>> dipergunakan sebagai
>> model velocity justru menunjukkan discrepancy hingga
>> 150 kaki, terlalu
>> banyak.
>>
>> Ketika dipetakan lebih lanjut, ternyata keduanya
>> sama-sama betul.
>>
>> Geophysicistnya memetakan top dari carbonate
>> envelope
>>
>> Geologistnya melakukan pick pada top carbonate dari
>> log yang dicirikan
>> oleh perubahan drastic baik di GR, resistivity,
>> travel time maupun
>> density-neutron-nya), jadi betul-betul pick top
>> carbonate envelope at
>> the well.
>>
>> Bermain-main dengan atribut yang diturunkan dari
>> picking si geophysicist
>> (ndak usah lah disebutkan, nanti dikata dagangan
>> lagi), kita melihat
>> adanya pola-pola ellipsoid atupun rounded yang
>> terorientasi dengan baik,
>> yang ternyata searah dengan tegasan-tegasan tektonik
>> setempat.
>>
>> Ternyata, sumur-sumur yang menimbulkan discrepancy
>> time-depth tersebut
>> berada pada pada zona-zona yang dibatasi oleh
>> ellipsoid tersebut, dan
>> ketika dilakukan cross check (ini kebetulan ada
>> sidewallcore-nya),
>> sample yang berada diatas carbonate envelope
>> tersebut (dideskripsi
>> sebagai calcareous shale) lebih tepat jika
>> dideskripsi sebagai paleo
>> soil.
>>
>> Jadi, besar kemungkinan zone-zone yang berupa
>> ellipsoid tersebut adalah
>> paleo doline / sinkhole, hal yang sangat lumrah
>> dijumpai pada karst
>> topography.
>>
>> Kadang-kadang kalau sudah kecanggihan memang suka
>> lupa back to basic.
>>
>> Bambang
>>
>>
>
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