Garuda - Garba Rujukan Digital

Lateral Reservoir Drainage in some Indonesia’s Sedimentary Basins and Its Implication to Hydrodynamic Trapping Ramdhan, Agus Mochamad; Hutasoit, Lambok Maringan; Slameto, Edy
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

DOI: 10.17014/ijog.5.1.65-80Lateral reservoir drainage is a hydrodynamic flow type driven by the difference in overpressure. It can lead to hydrodynamically tilted hydrocarbon water contact, and open an opportunity of finding oil and gas in places where previously are not considered as potential traps. In this paper, some examples of the presence of hydrodynamic traps in Indonesia’s sedimentary basin are discussed. Tilted hydrocarbon water contacts are present in some fields in the Lower Kutai Basin, and our interpretation is that regional lateral reservoir drainage is present in this basin and is responsible for the tilted contacts. It is also interpreted that lateral reservoir drainage leading to tilted hydrocarbon water contacts may be present at the Arun Field - North Sumatra Basin, Vorwata Field - Bintuni Basin, and BD Field - offshore East Java Basin. As most Indonesia’s sedimentary basins are overpressured, the presence of lateral reservoir drainage driven by overpressure difference in the same stratigraphic unit is very plausible to occur, opening the opportunity for hydrodynamically tilted hydrocarbon water contact to be present.

Lateral Reservoir Drainage in some Indonesiaâ€™s Sedimentary Basins and Its Implication to Hydrodynamic Trapping Ramdhan, Agus Mochamad; Hutasoit, Lambok Maringan; Slameto, Edy
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

DOI: 10.17014/ijog.5.1.65-80Lateral reservoir drainage is a hydrodynamic flow type driven by the difference in overpressure. It can lead to hydrodynamically tilted hydrocarbon water contact, and open an opportunity of finding oil and gas in places where previously are not considered as potential traps. In this paper, some examples of the presence of hydrodynamic traps in Indonesiaâ€™s sedimentary basin are discussed. Tilted hydrocarbon water contacts are present in some fields in the Lower Kutai Basin, and our interpretation is that regional lateral reservoir drainage is present in this basin and is responsible for the tilted contacts. It is also interpreted that lateral reservoir drainage leading to tilted hydrocarbon water contacts may be present at the Arun Field - North Sumatra Basin, Vorwata Field - Bintuni Basin, and BD Field - offshore East Java Basin. As most Indonesiaâ€™s sedimentary basins are overpressured, the presence of lateral reservoir drainage driven by overpressure difference in the same stratigraphic unit is very plausible to occur, opening the opportunity for hydrodynamically tilted hydrocarbon water contact to be present.

Lateral Reservoir Drainage in some Indonesiaâ€™s Sedimentary Basins and Its Implication to Hydrodynamic Trapping Ramdhan, Agus Mochamad; Hutasoit, Lambok Maringan; Slameto, Edy
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.5.1.65-80

DOI: 10.17014/ijog.5.1.65-80Lateral reservoir drainage is a hydrodynamic flow type driven by the difference in overpressure. It can lead to hydrodynamically tilted hydrocarbon water contact, and open an opportunity of finding oil and gas in places where previously are not considered as potential traps. In this paper, some examples of the presence of hydrodynamic traps in Indonesiaâ€™s sedimentary basin are discussed. Tilted hydrocarbon water contacts are present in some fields in the Lower Kutai Basin, and our interpretation is that regional lateral reservoir drainage is present in this basin and is responsible for the tilted contacts. It is also interpreted that lateral reservoir drainage leading to tilted hydrocarbon water contacts may be present at the Arun Field - North Sumatra Basin, Vorwata Field - Bintuni Basin, and BD Field - offshore East Java Basin. As most Indonesiaâ€™s sedimentary basins are overpressured, the presence of lateral reservoir drainage driven by overpressure difference in the same stratigraphic unit is very plausible to occur, opening the opportunity for hydrodynamically tilted hydrocarbon water contact to be present.

Evaluasi Nilai Parameter Akuifer Tidak Tertekan Berdasarkan Data Uji Pemompaan dan Analisis Ukuran Butir Agus Mochamad Ramdhan; Arifin Arifin; Rusmawan Suwarman
Jurnal Lingkungan dan Bencana Geologi Vol 12, No 2 (2021)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v12i2.376

ABSTRAKUji pemompaan merupakan metode yang dianggap paling baik dalam menentukan nilai parameter akuifer. Namun, ada kemungkinan bahwa nilai parameter akuifer yang dihitung menggunakan data uji pemompaan tersebut tidak merepresentasikan nilai parameter akuifer yang sebenarnya. Sebagai sebuah studi kasus, data uji pemompaan akuifer tidak tertekan dari dua sumur observasi (1 dan 2) pada salah satu daerah di SE Asia dianalisis menggunakan metode pencocokan kurva dengan dua skenario. Pada skenario 1, nilai parameter akuifer dihitung dengan mengasumsikan sumur pemompaan dan observasi menembus seluruh ketebalan akuifer (fully penetrating well), sedangkan pada skenario 2 nilai parameter akuifer dihitung berdasarkan kondisi sumur pemompaan dan observasi yang sebenarnya, yaitu menembus hanya sebagian ketebalan akuifer (partially penetrating well). Selain itu, nilai konduktivitas hidraulik akuifer juga diestimasi berdasarkan analisis ukuran butir. Hasilnya menunjukkan bahwa asumsi pada skenario 1 akan menyebabkan nilai konduktivitas hidraulik dalam arah vertikal menjadi lebih besar dari yang seharusnya. Nilai specific yield yang mendekati nilai referensi, berdasarkan litologi pasir kerikilan yang dominan pada daerah studi, hanya diperoleh menggunakan data uji pemompaan dari sumur observasi 1 pada kedua skenario. Adapun hasil estimasi nilai konduktivitas hidraulik berdasarkan analisis ukuran butir memperlihatkan nilai konduktivitas hidraulik yang lebih besar dibandingkan nilai konduktivitas hidraulik yang dihitung berdasarkan data uji pemompaan.Kata kunci: akuifer tidak tertekan, analisis ukuran butir, parameter akuifer, uji pemompaanABSTRACT The pumping test is considered as the best method in determining the values of the aquifer parameter. However, there is a possibility that the values calculated using the pumping test data do not represent the actual aquifer parameter values. As a case study, pumping test data of unconfined aquifer from two observation wells (1 and 2) in an area of SE Asia were analyzed using the Neuman’curve matching method with two scenarios. In scenario 1, the aquifer parameter values were calculated by assuming the pumping and observation wells penetrate the entire thickness of the aquifer (fully penetrating well), while in scenario 2 the values were calculated based on the actual conditions of the pumping and observation wells, i.e., penetrating the aquifer thickness partially (partially penetrating well). In addition, the hydraulic conductivity of the aquifer was also estimated based on grain size analysis. The results show that the assumptions in scenario 1 will cause the vertical hydraulic conductivity value to be greater than it should be. The specific yield value close to the reference value, based on the dominant lithology of gravelly sand in the study area, was only obtained using the pumping test data from the observation well 1 in both scenarios. The results of the hydraulic conductivity value estimation based on grain size analysis show that the hydraulic conductivity value is greater than the hydraulic conductivity value calculated based on the pumping test data. Keywords: unconfined aquifer, grain size analysis, aquifer parameter, pumping test

Evaluasi Model SWAT-MODFLOW Dalam Simulasi Air tanah- Air Permukaan DAS Cisangkuy Abdullah Husna; Rusmawan Suwarman; Agus Mochamad Ramdhan
Jurnal Lingkungan dan Bencana Geologi Vol 13, No 1 (2022)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v13i1.341

Pemahaman komprehensif interaksi hidrologi–hidrogeologi dapat dilakukan dengan pendekatan pemodelan numerik. Salah satu perangkat coupled model interaksi hidrologi-hidrogeologi adalah SWAT-MODFLOW. Penelitian ini ditujukan untuk mengevaluasi kemampuan SWAT-MODFLOW dan memahami interaksi hidrologi dan hidrogeologi dengan studi kasus wilayah Daerah Aliran Sungai Cisangkuy, Kabupaten Bandung. Hasil dari simulasi SWAT-MODFLOW dapat memperlihatkan pengaruh air permukaan pada kondisi air tanah di daerah penelitian dengan cukup baik. Hasil ini ditunjukkan dengan nilai = 0.52 hingga 0.67 dan fluktuasi muka air tanah sebesar 1 hingga 2 m sesuai dengan observasi di lapangan.

ANALISIS PENGARUH NILAI KONDUKTIVITAS HIDRAULIK DAN DISPERSIVITAS DINAMIK TERHADAP REMEDIASI AIR TANAH MENGGUNAKAN SIMULASI NUMERIK Agus Mochamad Ramdhan; Arifin Arifin; Erik Hermawan; Lambok M. Hutasoit
JURNAL TEKNIK HIDRAULIK Vol 12, No 2 (2021): JURNAL TEKNIK HIDRAULIK
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v12i2.658

Groundwater remediation is one of the solutions to restore the contaminated groundwater. This study was conducted to determine the effect of hydraulic conductivity and dynamic dispersivity on the groundwater remediation effectiveness. As a case study, in 2020, in an area located in Balikpapan, groundwater remediation will be carried out by injecting water containing NaOH through five wells and pumping it back through five wells to form a cycle. The method used is a numerical simulation consisting of groundwater flow simulation, mass transport, and sensitivity analysis. The results show that it takes 124 to 300 days for the injected NaOH to arrive at the pumping wells. The sensitivity analysis results show that when the hydraulic conductivity value is ten times greater, the time required is reduced to 84 to 172 days. Meanwhile, when the dynamic dispersivity is twice larger, the time required is reduced to 75 to 189 days. These results indicate that the groundwater remediation method will be effective for aquifers with high hydraulic conductivity and dynamic dispersivity values. For the study area, the groundwater remediation is suggested to be carried out by increasing the number of injection and pumping wells with a relatively close distance, i.e., around 10 meters, so that NaOH arrives at the pumping wells more quickly.Keywords: groundwater, remediation, hydraulic conductivity, dynamic dispersivity, numerical simulation

Wireline logs vs drilling events: Which one to believe in implying subsurface pressure? Agus Mochamad Ramdhan; Arifin Arifin; Rusmawan Suwarman
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 31, No 2 (2021)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/risetgeotam2021.v31.1176

As generally known, subsurface pressure can be implied using both wireline logs and drilling events. However, there may be a case where wireline logs and drilling events do not indicate the same subsurface pressure. Data from four vertical wells located in the South Sumatra Basin, Indonesia, were analyzed as a case study. Two wells, Wells A and D, encountered high overpressured zones, confirmed by drilling events and wireline logs data. The two others, Wells B and C, only encountered low overpressured zones, inferred by the relatively low mudweight used during the drilling. However, the wireline logs of Wells B and C show a reversal as Wells A and D. There are two hypotheses to explain the condition in Wells B and C. First, the wireline logs reversal is due to shallow carbonate cementation. Second, Wells B and C were drilled in an unintentional underbalanced condition. The method used includes XRD, SEM, and titration analysis. The results show that the first hypothesis is false, while the second is true. It may be due to some missing information related to drilling events in the final well report of Wells B and C.

Lateral Reservoir Drainage in some Indonesia’s Sedimentary Basins and Its Implication to Hydrodynamic Trapping Agus Mochamad Ramdhan; Lambok Maringan Hutasoit; Edy Slameto
Indonesian Journal on Geoscience Vol 5, No 1 (2018)
Publisher : Geological Agency

DOI: 10.17014/ijog.5.1.65-80Lateral reservoir drainage is a hydrodynamic flow type driven by the difference in overpressure. It can lead to hydrodynamically tilted hydrocarbon water contact, and open an opportunity of finding oil and gas in places where previously are not considered as potential traps. In this paper, some examples of the presence of hydrodynamic traps in Indonesia’s sedimentary basin are discussed. Tilted hydrocarbon water contacts are present in some fields in the Lower Kutai Basin, and our interpretation is that regional lateral reservoir drainage is present in this basin and is responsible for the tilted contacts. It is also interpreted that lateral reservoir drainage leading to tilted hydrocarbon water contacts may be present at the Arun Field - North Sumatra Basin, Vorwata Field - Bintuni Basin, and BD Field - offshore East Java Basin. As most Indonesia’s sedimentary basins are overpressured, the presence of lateral reservoir drainage driven by overpressure difference in the same stratigraphic unit is very plausible to occur, opening the opportunity for hydrodynamically tilted hydrocarbon water contact to be present.

Lateral Reservoir Drainage in some Indonesia’s Sedimentary Basins and Its Implication to Hydrodynamic Trapping Agus Mochamad Ramdhan; Lambok Maringan Hutasoit; Edy Slameto
Indonesian Journal on Geoscience Vol. 5 No. 1 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.5.1.65-80

DOI: 10.17014/ijog.5.1.65-80Lateral reservoir drainage is a hydrodynamic flow type driven by the difference in overpressure. It can lead to hydrodynamically tilted hydrocarbon water contact, and open an opportunity of finding oil and gas in places where previously are not considered as potential traps. In this paper, some examples of the presence of hydrodynamic traps in Indonesia’s sedimentary basin are discussed. Tilted hydrocarbon water contacts are present in some fields in the Lower Kutai Basin, and our interpretation is that regional lateral reservoir drainage is present in this basin and is responsible for the tilted contacts. It is also interpreted that lateral reservoir drainage leading to tilted hydrocarbon water contacts may be present at the Arun Field - North Sumatra Basin, Vorwata Field - Bintuni Basin, and BD Field - offshore East Java Basin. As most Indonesia’s sedimentary basins are overpressured, the presence of lateral reservoir drainage driven by overpressure difference in the same stratigraphic unit is very plausible to occur, opening the opportunity for hydrodynamically tilted hydrocarbon water contact to be present.

ANALISIS MEKANISME TERJADINYA TEKANAN-LUAP DAN PREDIKSI TEKANAN PORI PADA LAPANGAN BD, CEKUNGAN JAWA TIMUR Ryan Surjaudaja; Agus Mochamad Ramdhan; Indra Gunawan
Bulletin of Geology Vol 1 No 2 (2017): Bulletin of Geology
Publisher : Fakultas Ilmu dan Teknologi Kebumian (FITB), Institut Teknologi Bandung (ITB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/bull.geol.2017.1.2.2

The East Java Basin is one of the sedimentary basins with proven petroleum system and very prospective as an exploration target. However, drilling in this basin is a risky operation because of the presence of overpressure, which is shown by kick and lost during exploration wells drilling in BD Field as an example. Drilling problems and drilling risks can be reduced by doing overpressure study, including overpressure generating mechanism, pore pressure prediction, and estimation top of overpressure. The temperature in this field can reach 80°C at the depth around 1500 m SSTVD. However, the Dutta-Katahara crossplot does not indicate any diagenesis of smectite to illite. It is also confimed by XRD data in one of the well, which shown domination of kaolinitic clay mineral. Based on the vitrinite reflectance data, there is no transformation of kerogene to hydrocarbon in this field. The burial history plot shows rapid sedimentation with the rate of 1723 m/million years. Based on those criterias, the main overpressure generating mechanism is interpreted to be loading mechanism. High sedimentation rate is related to the peak inversion in Plio-Pleistocene time, providing abundant of sediment supply into the basin. Pore pressure in this field can be estimated by using sonic data with Eaton’s method. Both direct and indirect pressure measurements, combine with drilling data are used to support this estimation. Based on well data, top of overpressure in this field is located at the depth around 1500-1600 m SSTVD. The top of overpressure is located within Lidah Formation.

Title

Found 12 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 12 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 12 Documents
Search