6

KARAKTERISTIK RESERVOAR BATUAN KARBONAT

PADA FORMASI KAIS, CEKUNGAN SALAWATI, PAPUA

BARAT BEDASARKAN DATA SEISMIK DAN DATA LOG

SUMUR

SARIOLEH :

DEVINA RIZKY TRIMENDA

111.090.101

Lokasi penelitian merupakan salah satu daerah operasi JOB

Pertamina-PetroChina, terletak pada Cekungan Salawati, Papua Barat.

Daerah penelitian secara geografis termasuk dalam Kabupaten Sorong.

Penelitian ini difokuskan pada Formasi Kais. Secara regional, umur formasi

ini adalah Miosen Awal-Miosen Akhir.

Berdasarkan hasil analisis dan interpretasi data seismik dan log sumur

daerah telitian, didapatkan fasies Build-up dan Platform serta beberapa satuan

litofasies batuan karbonat yang berkembang, yakni wackestone, packestone

dan grainstone. Lingkungan pengendapan Formasi Kais yaitu Shallow

Marine. Nilai petrofisik yang didapat pada nilai rata-rata porositas efektif

minimum 7.09% maksimum 30.46%, pada nilai rata-rata permeabilitas

minimum 577.42 mD dan maksimum 868.36 mD. Porositas dan

peremeabilitas terbesar berada pada fasies Build-up. Nilai rata-rata saturasi

air minimum 24.55% pada fasies Build-up dan maksimum 31.64% pada

fasies Platform. Berdasarkan hasil pemetaan bawah permukaan diperkirakan

struktur sesar yang berkembang berarah timurlaut-baratdaya.

7

CARBONATE RESERVOIR CHARACTERIZATION OF

KAIS FORMATION, SALAWATI BASIN, WEST PAPUA

BASED ON SEISMIC DATA AND WIRELINE LOG DATA

ABSTRACT

By:

DEVINA RIZKY TRIMENDA

111.090.101

This research one of the areas of research operations JOB Pertamina-

PetroChina Salawati, located at Salawati Basin, West Papua. Based on

geograhically this area include in Sorong Regency. This study is focused on

Kais Formation. Regionally age of Kais Formation is Early Miocene-Late

Miocene.

Based on the analysis and interpretation of seismic data and wireline

log, research area obtained Build-up facies and Platform. And it has several

litofacies which grow up at research area like wackestone, packestone and

grainstone. Depositional environment of Kais Formation in Shallow Marine.

Petrophysical values obtained the average of effective porosity minimum

7.09% and maximum 30.46%, and the average of permeability have

minimum value 577.42 mD and maximum value 868.36 mD. The highest

values of porosity and permeabilty in Build-up facies. And the average of

saturation water minimum 24.55% in Build-up facies and maximum 31.64%

in Platform Fasies. Based on subsurface map, estimate the fault structure is

trending northeast-southwest.