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Characteristics of Arun Carbonate Reservoir and Its Implication To Optimize the Most Potential Gas Resource Zone In Arun Gas Field, Aceh, Indonesia Riza Atmadibrata; Dicky Muslim; R. Febri Hirnawan; Abdurrokhim Abdurrokhim
Indonesian Journal on Geoscience Vol 6, No 2 (2019)
Publisher : Geological Agency

DOI:10.17014/ijog.6.2.209-222Since the discovery of major oil and gas reserves in carbonate rocks in the Middle East, carbonate reservoirs became important to the petroleum industry. Carbonate rocks have covered only 20% of the sedimentary rock records. However, carbonate reservoirs hold 50% of the world petroleum reserves. Arun Carbonate Reservoir is one of the biggest proven retrograde gas reservoirs in the world. After more than thirty years of production, Arun Carbonate Reservoir had an initial gas in place of 14.1 TCF residual hydrocarbon gas. The issue makes Arun Carbonate Reservoir became an interest to be studied for the development and production of hydrocarbon in other carbonate reservoirs in Indonesia. One of the fundamental topics to be studied is the characteristics of Arun Carbonate Reservoir itself. The characteristics of carbonate reservoir usually cause a lot of geologic and engineering problems in the development and production of hydrocarbon reserves. This paper aims to identify the characteristics of Arun Carbonate Reservoir and its implication to delineate the potential gas resource zone in the Arun Gas Field, Aceh, Indonesia. The data from sixteen wells have been examined through several multidiscipline studies: geophysics (well logging), geology (facies, lithology and diagenetic analyses), and petrophysics (core analysis). The result of this study shows that Arun Carbonate Reservoir (N5-N8) contains limestone 92%, 5% dolomite, and 3% dolomitic limestone (or other), and petrophysically have 16% porosity and 13.5 md permeability in average. Arun Carbonate Reservoir is divided into four facies (Reef, Near Reef, Inter Reef Lagoon, and Middle Shelf). Of four facies in Arun Carbonate Reservoir, only two facies which can be categorized as productive facies: Reef and Lagoonal Facies. The potential zones of hydrocarbon resources have vertically been documented in Arun Carbonate Reservoir.

PREDIKSI NILAI KUAT TEKAN UNIAKSIAL BATUAN PENGAPIT BATUBARA MENGGUNAKAN DATA ULTRASONIK DI KABUPATEN MUSI BANYUASIN SUMATERA SELATAN Zulfahmi Zulfahmi; Ildrem Sjafri; Abdurrokhim Abdurrokhim; Ridho Kresna Wattimena
Jurnal Teknologi Mineral dan Batubara Vol 13, No 1 (2017): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2017
Publisher : Puslitbang tekMIRA

Dukungan data geomekanika sangat dibutuhkan dalam merancang gasifier, analisis dan pemodelan pada gasifikasi batubara bawah tanah (underground coal gasification-UCG), baik yang berasal dari uji langsung (in-situ) maupun uji laboratorium. Salah satu data pengujian laboratorium yang cukup penting untuk mengevaluasi kondisi batuan di lokasi UCG adalah uji kuat tekan uniaksial (uniaxial compressive strength test-UCS). Uji ini membutuhkan dimensi percontoh spesifik yang tidak digunakan untuk uji laboratorium lain seperti uji geser langsung, triaksial atau brazzilian. Karena itu, untuk optimalisasi pengujian percontoh harus dipilih secara selektif karena untuk mendapatkan percontoh dari pemboran inti sangat sulit, memakan waktu dan sangat mahal. Salah satu cara untuk mengoptimalkan pemanfaatan percontoh adalah dengan melakukan korelasi dengan hasil uji lain yang memiliki output yang sama. Pada penelitian ini telah dilakukan korelasi antara uji UCS yang bersifat merusak (destructive) dengan uji ultrasonik yang bersifat tidak merusak (non-destructive), relatif murah, cepat, mudah dan percontoh dapat digunakan lagi untuk uji yang lain. Sebanyak 89 uji UCS dan ultrasonik telah dilakukan untuk memperoleh tiga korelasi empiris nilai UCS dan ultrasonik yang berasal dari percontoh batuan pengapit batubara (batu lempung, batu lanau dan batu pasir). Korelasi ini dapat digunakan untuk memprediksi nilai UCS secara empiris di lokasi telitian yaitu di desa Macang Sakti, Kecamatan Sangadesa, Kabupaten Musi Banyuasin, Propoinsi Sumatera Selatan. Korelasi tersebut dihasilkan dari persamaan polinomial orde 2 dan 3. Untuk batu lempung nilai sc dapat diperoleh dari UCScls = (2 x 10-10)Vp3-(5 x 10-6)Vp2+ 0,0404Vp - 20,986 dengan nilai R2 =0,9087. Untuk batu lanau nilai sc dapat diperoleh UCSsis = (3 x 10-6)Vp2+ 0,0051Vp + 9,8665 dengan nilai R2 = 0,8953 dan nilai sc batu pasir dapat diperoleh dari UCSsas = -(7 x 10-7)Vp2 + 0,0467Vp - 41,484 dengan nilai R2 = 0,8864.

A SUCCESS CASE OF WIDURI AREA REJUVENATION, ASRI BASIN, OFFSHORE SE SUMATRA BLOCK, INDONESIA Dwandari Ralanarko; Ildrem Syafri; Abdurrokhim Almabrury; Andi Agus Nur
BULLETIN OF THE MARINE GEOLOGY Vol 36, No 2 (2021)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.36.2.2021.704

INTA/B Field is one of the most producing mature fields in Widuri Area, Asri Basin, Offshore SE Sumatera, Indonesia, therefore it is subjected to rejuvenation to enhance hydrocarbon production. INTA/B Field is distinguished from other fields from its featured anticlinal structures that have the northeast-southwest trending. This structure is heavily faulted mainly in the up-thrown south side of a major normal fault. Two structural configurations with various oil-water contact have successfully been identified within the field. The most of oil reserves are preserved in the western lobe in which Intan-1 sands. One of the most important reservoirs in this field is Talangakar (TAF) sand deposited as a meandering river system that streamed from the northwest to the southeast within the basin. Two main reservoirs, Gita-34A and Gita-34B are correlated throughout the field and interpreted as Miocene fluvio-channel sands. These two channels are thickened moderately from southwest to northeast which has descriptions as follows: fine- to-coarse grains, unconsolidated to friable, and low cementing materials.INTA/B Field has been produced for 25 years and currently undergoing a watered-out phase. Therefore, an integrated study is subjected to overcome this issue for mature field rejuvenation. The integrated study ranged from geology (e.g., depositional environment and facies analysis), geophysics (e.g., revisiting and reprocessing of seismic attributes), petrophysical calculation, and reservoir engineering (e.g., water conformance plot and volumetric calculation).This integrated study has successfully rejuvenated a mature field resulting and added a significant number in oil production with an average of 300 BPOD/well. The extended project is estimated to have a similar result to the forward pilot.

PRELIMINARY GEOMECHANICAL ANALYSIS ON LIMESTONES IN PPSDM GEOMINERBA CAMPUS, PADALARANG, WEST JAVA Irvan Sophian; Herlinawati H; Nur Khairullah; Abdurrokhim A; Iyan Haryanto; Hendarmawan H
Indonesian Mining Journal Vol 22, No 1 (2019): INDONESIAN MINING JOURNAL, Vol. 22 No. 1, April 2019
Publisher : Puslitbang tekMIRA

The research location is in the PPSDM Geominerba field campus. The campus is located in Padalarang, West Java that is surrounded by the open-pit mining of limestone and marble. This limestone was formed in Oligo-Miocene of Rajamandala Formation. The research objective was to determine the condition of the slopes around the campus based on geomechanical characteristics. Based on field observations, the slope angle in the area is dominated by steep slopes. The rock hardness level is dominated by hard rock with a hardness ranging from 50-100 MPa. Rock Mass Rating shows that the area is dominated by good rocks. While the Slope Mass Rating calculation show that the maximum slope angle is between 52-75°. Level of deformation and intensive weathering process will reduce the strength of the rock in the future. Several rock fall occurrences on this research area support this assumption. Yet, some local open pit mining area activity near the toe hill of the area need to be concerned regarding the effect of the local rock fall occurrences.

SUBSIDENCE AND HEAT PROPAGATION MODELING ON THE UNDERGROUND COAL GASIFICATION (CASE STUDY AT MUARA ENIM FORMATION, SOUTH SUMATERA) Zulfahmi Zulfahmi; Ildrem Syafri; Abdurrokhim Abdurrokhim; Ridho Kresna Wattimena
Indonesian Mining Journal Vol 23, No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Puslitbang tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.1132

One of the important issues to study underground coal gasification (UCG) is the prediction of surface subsidence. Several parameters that influence these conditions are the thickness of cap rock, the physical and mechanical characteristics, the structure condition, the minerals composition of the rock, and external conditions. This study had been carried out simulation and modeling to determine the level of surface subsidence risk and the effect of high temperatures due to the activities. The modeling results show that the thickness of the rock above the UCG coal seam greatly affects the surface subsidence. The depth is more than 200 m and found that the SF value is 1.59 which indicates UCG reactor depth of ≥ 200 m is safe from the risk of subsidence. From the characteristic aspect of the cap rock, the claystone types which not contain kaolinite minerals are more prone to collapse than those of contain kaolinite minerals. From this models, the gasifier at 150 m depth was estimated that there will be a decline of -7.23 m, and the minimum subsidence is at 275 m about 0.1 m. The heat propagation modeling results show that at 50 m the temperature is estimated to be 213- 289°C, but if the thickness of the cap rock is > 200 m depth, the temperature is around 29-28°C.

KAJIAN KERENTANAN TANAH BERDASARKAN ANALISIS HVSR DI DAERAH SEMBURAN LUMPUR SIDOARJO DAN SEKITARNYA, JAWA TIMUR, INDONESIA Karyono Karyono; Ildrem Syafri; Abdurrokhim Abdurrokhim; Masturyono Masturyono; Supriyanto Rohadi; Januar Arifin; Ajat Sudrajat; Adriano Mazzini; Soffian Hadi; Agustya Agustya
Jurnal Meteorologi dan Geofisika Vol 17, No 1 (2016)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Aluvium merupakan fitur geologi yang memiliki sifat rentan terhadap pengaruh gempabumi. Daerah Porong dan sekitarnya tempat semburan Lumpur Sidoarjo (Lusi) terjadi merupakan daerah dataran yang ditutupi oleh endapan aluvium Delta Brantas, sehingga daerah ini merupakan zona lemah yang rentan terhadap pengaruh gempabumi. Hal ini diperkuat dengan adanya sesar Watukosek di daerah tersebut. Dengan tujuan untuk membuktikan hal tersebut maka dilakukan observasi seismik dengan cara memasang 71 stasiun pengamat gempabumi temporal yang tersebar di daerah Sidoarjo dan sekitarnya. Hasil analisis Horizontal Vertical Spectral Ratio (HVSR) terhadap data seismik diperoleh sebaran frekuensi natural bawah permukaan lebih rendah di daerah Lusi yaitu 0,4Hz. Hasil analisis juga mengungkap bahwa di daerah tersebut mempunyai amplifikasi tanah sebesar 5,2 dan tingkat kerentanan tanah sebesar 56, lebih tinggi dibandingkan dengan daerah lain di sekitarnya. Karena letaknya di zona lemah, maka berimplikasi bahwa Lusi menjadi sensitif terhadap gangguan luar misalnya dampak kejadian gempabumi menjadi lebih besar pada daerah ini. Alluvium is a geological feature characterized by high risk vulnerability influenced by the earthquakes. Porong and surrounding areas where the eruption of Lumpur Sidoarjo’s (Lusi) occurred are areas covered by alluvium sediment of Brantas Delta, as consequences this area is a weak zone characterized by high risk vulnerability as well. This is also supported by the present of Watukosek fault system in this area. To proved, we deployed 71 temporary seismic stations distributed in and around Sidoarjo area. The Horizontal Vertical Spectral Ratio (HVSR) analysis revealed that the natural frequency in Lusi area is about 0.4Hz, this is lower than other part areas. The analysis also revealed that this area has soil amplification about 5.2 and soil vulnerability index about 56, these are higher compared with other part areas. These results support that this area is a weak zone. Because of its location in a weak zone, this implies that Lusi became sensitive to external perturbation for example the earthquake events would have greater impact to this area.

KAJIAN KERENTANAN TANAH BERDASARKAN ANALISIS HVSR DI DAERAH SEMBURAN LUMPUR SIDOARJO DAN SEKITARNYA, JAWA TIMUR, INDONESIA Karyono Karyono; Ildrem Syafri; Abdurrokhim Abdurrokhim; Masturyono Masturyono; Supriyanto Rohadi; Januar Arifin; Ajat Sudrajat; Adriano Mazzini; Soffian Hadi; Agustya Agustya
Jurnal Meteorologi dan Geofisika Vol. 17 No. 1 (2016)
Publisher : Pusat Penelitian dan Pengembangan BMKG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31172/jmg.v17i1.398

Aluvium merupakan fitur geologi yang memiliki sifat rentan terhadap pengaruh gempabumi. Daerah Porong dan sekitarnya tempat semburan Lumpur Sidoarjo (Lusi) terjadi merupakan daerah dataran yang ditutupi oleh endapan aluvium Delta Brantas, sehingga daerah ini merupakan zona lemah yang rentan terhadap pengaruh gempabumi. Hal ini diperkuat dengan adanya sesar Watukosek di daerah tersebut. Dengan tujuan untuk membuktikan hal tersebut maka dilakukan observasi seismik dengan cara memasang 71 stasiun pengamat gempabumi temporal yang tersebar di daerah Sidoarjo dan sekitarnya. Hasil analisis Horizontal Vertical Spectral Ratio (HVSR) terhadap data seismik diperoleh sebaran frekuensi natural bawah permukaan lebih rendah di daerah Lusi yaitu 0,4Hz. Hasil analisis juga mengungkap bahwa di daerah tersebut mempunyai amplifikasi tanah sebesar 5,2 dan tingkat kerentanan tanah sebesar 56, lebih tinggi dibandingkan dengan daerah lain di sekitarnya. Karena letaknya di zona lemah, maka berimplikasi bahwa Lusi menjadi sensitif terhadap gangguan luar misalnya dampak kejadian gempabumi menjadi lebih besar pada daerah ini. Alluvium is a geological feature characterized by high risk vulnerability influenced by the earthquakes. Porong and surrounding areas where the eruption of Lumpur Sidoarjo’s (Lusi) occurred are areas covered by alluvium sediment of Brantas Delta, as consequences this area is a weak zone characterized by high risk vulnerability as well. This is also supported by the present of Watukosek fault system in this area. To proved, we deployed 71 temporary seismic stations distributed in and around Sidoarjo area. The Horizontal Vertical Spectral Ratio (HVSR) analysis revealed that the natural frequency in Lusi area is about 0.4Hz, this is lower than other part areas. The analysis also revealed that this area has soil amplification about 5.2 and soil vulnerability index about 56, these are higher compared with other part areas. These results support that this area is a weak zone. Because of its location in a weak zone, this implies that Lusi became sensitive to external perturbation for example the earthquake events would have greater impact to this area.

PREDIKSI NILAI KUAT TEKAN UNIAKSIAL BATUAN PENGAPIT BATUBARA MENGGUNAKAN DATA ULTRASONIK DI KABUPATEN MUSI BANYUASIN SUMATERA SELATAN Zulfahmi Zulfahmi; Ildrem Sjafri; Abdurrokhim Abdurrokhim; Ridho Kresna Wattimena
Jurnal Teknologi Mineral dan Batubara Vol 13 No 1 (2017): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2017
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/jtmb.Vol13.No1.2017.157

Dukungan data geomekanika sangat dibutuhkan dalam merancang gasifier, analisis dan pemodelan pada gasifikasi batubara bawah tanah (underground coal gasification-UCG), baik yang berasal dari uji langsung (in-situ) maupun uji laboratorium. Salah satu data pengujian laboratorium yang cukup penting untuk mengevaluasi kondisi batuan di lokasi UCG adalah uji kuat tekan uniaksial (uniaxial compressive strength test-UCS). Uji ini membutuhkan dimensi percontoh spesifik yang tidak digunakan untuk uji laboratorium lain seperti uji geser langsung, triaksial atau brazzilian. Karena itu, untuk optimalisasi pengujian percontoh harus dipilih secara selektif karena untuk mendapatkan percontoh dari pemboran inti sangat sulit, memakan waktu dan sangat mahal. Salah satu cara untuk mengoptimalkan pemanfaatan percontoh adalah dengan melakukan korelasi dengan hasil uji lain yang memiliki output yang sama. Pada penelitian ini telah dilakukan korelasi antara uji UCS yang bersifat merusak (destructive) dengan uji ultrasonik yang bersifat tidak merusak (non-destructive), relatif murah, cepat, mudah dan percontoh dapat digunakan lagi untuk uji yang lain. Sebanyak 89 uji UCS dan ultrasonik telah dilakukan untuk memperoleh tiga korelasi empiris nilai UCS dan ultrasonik yang berasal dari percontoh batuan pengapit batubara (batu lempung, batu lanau dan batu pasir). Korelasi ini dapat digunakan untuk memprediksi nilai UCS secara empiris di lokasi telitian yaitu di desa Macang Sakti, Kecamatan Sangadesa, Kabupaten Musi Banyuasin, Propoinsi Sumatera Selatan. Korelasi tersebut dihasilkan dari persamaan polinomial orde 2 dan 3. Untuk batu lempung nilai sc dapat diperoleh dari UCScls = (2 x 10-10)Vp3-(5 x 10-6)Vp2+ 0,0404Vp - 20,986 dengan nilai R2 =0,9087. Untuk batu lanau nilai sc dapat diperoleh UCSsis = (3 x 10-6)Vp2+ 0,0051Vp + 9,8665 dengan nilai R2 = 0,8953 dan nilai sc batu pasir dapat diperoleh dari UCSsas = -(7 x 10-7)Vp2 + 0,0467Vp - 41,484 dengan nilai R2 = 0,8864.

PRELIMINARY GEOMECHANICAL ANALYSIS ON LIMESTONES IN PPSDM GEOMINERBA CAMPUS, PADALARANG, WEST JAVA Irvan Sophian; Herlinawati H; Nur Khairullah; Abdurrokhim A; Iyan Haryanto; Hendarmawan H
Indonesian Mining Journal Vol 22 No 1 (2019): INDONESIAN MINING JOURNAL, Vol. 22 No. 1, April 2019
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol22.No1.2019.985

The research location is in the PPSDM Geominerba field campus. The campus is located in Padalarang, West Java that is surrounded by the open-pit mining of limestone and marble. This limestone was formed in Oligo-Miocene of Rajamandala Formation. The research objective was to determine the condition of the slopes around the campus based on geomechanical characteristics. Based on field observations, the slope angle in the area is dominated by steep slopes. The rock hardness level is dominated by hard rock with a hardness ranging from 50-100 MPa. Rock Mass Rating shows that the area is dominated by good rocks. While the Slope Mass Rating calculation show that the maximum slope angle is between 52-75°. Level of deformation and intensive weathering process will reduce the strength of the rock in the future. Several rock fall occurrences on this research area support this assumption. Yet, some local open pit mining area activity near the toe hill of the area need to be concerned regarding the effect of the local rock fall occurrences.

SUBSIDENCE AND HEAT PROPAGATION MODELING ON THE UNDERGROUND COAL GASIFICATION (CASE STUDY AT MUARA ENIM FORMATION, SOUTH SUMATERA) Zulfahmi Zulfahmi; Ildrem Syafri; Abdurrokhim Abdurrokhim; Ridho Kresna Wattimena
Indonesian Mining Journal Vol 23 No 2 (2020): INDONESIAN MINING JOURNAL, Vol. 23 No. 2, October 2020
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol23.No2.2020.1132

One of the important issues to study underground coal gasification (UCG) is the prediction of surface subsidence. Several parameters that influence these conditions are the thickness of cap rock, the physical and mechanical characteristics, the structure condition, the minerals composition of the rock, and external conditions. This study had been carried out simulation and modeling to determine the level of surface subsidence risk and the effect of high temperatures due to the activities. The modeling results show that the thickness of the rock above the UCG coal seam greatly affects the surface subsidence. The depth is more than 200 m and found that the SF value is 1.59 which indicates UCG reactor depth of ≥ 200 m is safe from the risk of subsidence. From the characteristic aspect of the cap rock, the claystone types which not contain kaolinite minerals are more prone to collapse than those of contain kaolinite minerals. From this models, the gasifier at 150 m depth was estimated that there will be a decline of -7.23 m, and the minimum subsidence is at 275 m about 0.1 m. The heat propagation modeling results show that at 50 m the temperature is estimated to be 213- 289°C, but if the thickness of the cap rock is > 200 m depth, the temperature is around 29-28°C.

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