Agus Priyantoro
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ANALISIS PROVENANCE, DIAGENESIS DAN LINGKUNGAN PENGENDAPAN SERTA PENGARUH TERHADAP KUALITAS RESERVOIR BATUPASIR FORMASI TALANG AKAR, SUMUR FA-21, CEKUNGAN JAWA BARAT UTARA Abdillah, Fahmi; Nugroho, Hadi; Fahrudin, Fahrudin; Priyantoro, Agus
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

The necessary of technology at this time resulted the necessary of energy resources will increasing, and it also result the scarcity of energy resources. One of the energy resources that is still used as a major energy resource is oil and gas. To overcome these problems, exploration activities at this time needs to be further improved. In the field of exploration, one of the most important things to know is reservoir. Reservoir quality is important for us to know so that we can determine whether an area has hydrocarbon potential to be developed or not. The main parameters of reservoir quality are porosity and permeability.In this study discussed the analysis of provenance, diagenetic and depositional environment of the sandstone reservoir of Talang Akar Formation, North West Java Basin and from the results of the analysis will be associated with the effect on reservoir quality. To determine the reservoir quality based on these parameters, can be done by several methods such as petrographic, cores, SEM and XRD analysis. From the analysis that has been done can be seen that the provenance of Talang Akar sandstone is Granite. So it can be seen that the Talang Akar sandstone which the provenance is Granite has good reservoir quality, with porosity values ranging from 19.04% to 24.28% and permeability ranging between 30-674 mD or belonging to the class good - very good (Koesoemadinata, 1980). Then the diagenetic process that occurs is compaction, cementation, replacement and dissolution. The process of compaction, cementation and replacement leads to reduced rock porosity values ranging from 2.25 to 11.5%, while the dissolution process resulting in increased rock porosity is about 1.5 - 2%. The depositional environment of the Talang Akar Sandstone is Upper Delta front. Rock facies in the upper delta front has good reservoir quality, with porosity values range from 19.04% to 24.28% and permeability range between 30-674 mD or belonging to the class is good - very good (Koesoemadinata, 1980). 
ANALISIS SIKUENSTRATIGRAFI UNTUK IDENTIFIKASI KOMPARTEMENTALISASI RESERVOIR KARBONAT FORMASI NGIMBANG BLOK SUCI, CEKUNGAN JAWA TIMUR UTARA (Sequence Stratigraphic Analysis for Identification of Carbonate Reservoir Compatementalization of Ngimbang Formation in Suci Block, North East Java Basin) Panuju, Panuju; Rahmat, Ginanjar; Priyantoro, Agus; Wijaksono, Egie; Wicaksono, Bambang
Lembaran Publikasi Minyak dan Gas Bumi Vol 51, No 3 (2017)
Publisher : Lembaran Publikasi Minyak dan Gas Bumi

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Abstract

Analisis sikuenstratigrafi telah dilakukan pada penampang sedimen Formasi Ngimbang di Blok Suci, Cekungan Jawa Timur Utara. Analisis ini dilakukan dengan tujuan untuk mengetahui suksesi vertikal dan perubahan fasies secara lateral dari unit sikuen reservoir karbonat pada Formasi tersebut sehingga kompartementalisasi fasies dari reservoir karbonat dapat dipahami secara rinci. Data yang digunakan dalam penelitian ini meliputi tiga well logs, biostratigrafi, lingkungan pengendapan dan petrografi dari sumur SUCI-1, SUCI-2 dan KMI-1 yang didukung penampang seismik. Penelitian ini dilakukan dengan mengintegrasikan semua data G & G dalam kerangka kronostratigrafi dan model pengendapan karbonat sehingga kompartementalisasi yang mengontrol konektifitas dan sifat fisik unit-unit reservoir karbonat dapat dipahami dengan baik. Hasil analisis menunjukkan bahwa reservoir karbonat Formasi Ngimbang di Blok Suci diendapkan selama Eosen Akhir sampai Oligosen Awal pada lingkungan neritik pinggir sampai batial atas. Secara kronostratigrafi, penampang karbonat Formasi Ngimbang dapat dibagi ke dalam tiga unit sikuen yang dipisahkan oleh bidang keidakselarasan, yaitu unit facies karbonat platform berumur Eosen Akhir di sekitar lokasi sumur SUCI-2, unit fasies karbonat platform berumur Oligosen Awal bagian bawah di sekitar lokasi sumur KMI-1 dan SUCI-2 dan unit fasies core reef berumur Oligosen Awal bagian atas di lokasi sekitar sumur SUCI-1. Hasil analisis tersebut dapat digunakan untuk menjelaskan fenomena akumulasi gas yang hanya dijumpai pada lokasi sumur SUCI-1, dan hanya gas show dan oil trace yang terobservasi di sumur SUCI-2, serta indikasi hidrokarbon yang sama sekali tidak ditemukan pada sumur KMI-1. Hal tersebut terjadi karena reservoir karbonat fasies core reef berumur Oligosen Awal hanya dijumpai pada lokasi sumur SUCI-1 dan tidak menerus ke lokasi Sumur SUCI-2 dan KMI-1. Analisis kompartementalisasi ini akan dapat meningkatkan rasio keberhasilan perusahaan-perusahaan migas yang melakukan pemboran dengan target batuan reservoir berupa batuan karbonat. Sequence stratigraphic analysis has been conducted on the sedimentary succession of Ngimbang Formation in Suci Block, North East Java Basin. This analysis is performed to know the genetic relationship and lateral facies change of carbonate reservoir of the formation thus facies compartmentalization of this carbonate reservoir can be understood. The data used in this study include 3 well logs, biostratigraphy, depositional environment and petrography reports of the SUCI-1, SUCI-2 and KMI-1, supported by seismik sections. This study was conducted by integrating all G & G data within Chronostratigraphy framework and carbonate deposition model thus compartmentalization controlling connectivities and physical properties among carbonate reservoir units can be well understood. Result of the analysis indicates that Ngimbang carbonate reservoirs in the SUCI Block were deposited during Late Eocene to Early Oligocene in the inner neritic to upper bathyal environments. The depositional setting of the sequences varies from shallow in the west (KMI-1) to become deeper in the east (SUCI- 2). Chronostratigraphy of the Ngimbang carbonate sequences shows three separated sequence units which include Late Eocene carbonate platform facies unit placing around the SUCI-2 well, the lower part of Early Oligocene to Eocene Carbonate platform facies unit at around both KMI-1 and SUCI-2 wells and the upper part of Early Oligocene core reef facies unit at around SUCI-1 well. All would be explaining how the gas accumulation does only occur in the SUCI-1 well, gas show and oil trace observed in SUCI-2 well, but no hydrocarbon indication found in the KMI-1 well. It is caused by a limited development of Early Oligocene core reef facies at SUCI-1 well location and not continuous to the location of SUCI-2 and KMI-1 wells. This compartmentalization analysis will increase the success ratio of oil and gas companies that drill with the target of carbonate reservoir rock.