----- Original Message -----
From: "Witan" <[EMAIL PROTECTED]>


> Teman2
> Saya punya pertanyaan basic nih, pada presentasi pak Haryono ttg Dongi
> discovery ada istilah "thief zone", ada yg bisa menerangkan ?
>

Dari kamus saya ....

Dalam engineering yg disebut Thief zone --> A very porous formation downhole
into which drilling mud is lost. Thief zones, which also include crevices
and caverns, must be sealed off with a liner or plugged with special cements
or fibrous clogging agents before drilling can resume.

Namun di dalam bidang geoscience eksplorasi (trap) ada yg juga memakai
istilah 'thief zone' ini yaitu adanya lapisan tipis sandstone atau porous
rock yang menyebabkan minyak/gas 'merembes' sehingga trap-nya bocor ...
sering dipakai atau dianalisa kalau menghadapi onlap trap (stratigraphic
trap).

rdp




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Indonesian Association of Geologists [IAGI] - 31st Annual Convention
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