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Effects of Fracture Parameters in an Anisotropy Model on P-Wave Azimuthal Amplitude Responses Fatkhan, Fatkhan
Journal of Engineering and Technological Sciences Vol 38, No 2 (2006)
Publisher : ITB Journal Publisher, LPPM ITB

The study showed that the presence of vertically aligned fractures in reservoir rock could possibly be inferred through analysis of P-wave reflectivity variations with azimuth. The azimuthal amplitude responses measured at an interface separating overburden anisotropy and fractured rock rely on several parameters that can be decomposed into the background rock and the fracture contributions.The effect of fracture porosity on P-wave azimuthal amplitude response is small for moderate incidence angles. For fluid filled fractures P-wave anisotropy is mildly affected. For dry fractures the difference in P-wave anisotropy between low and high fracture porosities is high. This suggests that an assumption of overburden isotropy may result in a large error in predicting the fluid type and saturation.

Effects of Fracture Parameters in an Anisotropy Model on P-Wave Azimuthal Amplitude Responses Fatkhan Fatkhan
Journal of Engineering and Technological Sciences Vol. 38 No. 2 (2006)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.eng.sci.2006.38.2.6

The study showed that the presence of vertically aligned fractures in reservoir rock could possibly be inferred through analysis of P-wave reflectivity variations with azimuth. The azimuthal amplitude responses measured at an interface separating overburden anisotropy and fractured rock rely on several parameters that can be decomposed into the background rock and the fracture contributions.The effect of fracture porosity on P-wave azimuthal amplitude response is small for moderate incidence angles. For fluid filled fractures P-wave anisotropy is mildly affected. For dry fractures the difference in P-wave anisotropy between low and high fracture porosities is high. This suggests that an assumption of overburden isotropy may result in a large error in predicting the fluid type and saturation.

KARAKTERISASI RESERVOIR UNTUK MENENTUKAN PERSEBARAN BATUPASIR PEMBAWA HIDROKARBON MENGGUNAKAN INVERSI SIMULTAN Juventa Juventa; Fatkhan Fatkhan
Jurnal Geofisika Eksplorasi Vol 7, No 1 (2021)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v7i1.94

Dalam exploitasi hidrokarbon, salah satu tantangan yang paling penting adalah pemetaan persebaran batuan reservoir dan fluida pengisinya. Salah satu metode yang digunakan adalah inversi simultan. Inversi simultan merupakan salah satu teknik inversi seismik yang mengekstraksi data AVO untuk memperoleh nilai impedansi seismik dari data seismik Pre-Stack hingga memperoleh nilai impedansi P dan S serta densitas. Salah satu metode lanjutan yang paling umum dipakai adalah metode Lambda-Mu-Rho (LMR) untuk membatu identifikasi litologi dan fluida resorvoir. Penelitian dilakukan dengan menggunakan data dari Lapangan Nova Scotia, dengan target pada batupasir Formasi Missisauga. Data yang digunakan adalah data sumur L-30 dan B-41 dan data seismik 3D PSTM. Sumur B-41 berada di struktur lebih tinggi dari sumur L-30 namun tidak menghasilkan hidrokarbon. Log Vs dibuat sintetik menggunakan metode Fluid Replacement Modeling dan LMR diturunkan dengan transformasi log Vp, Vs dan densitas. Hasil pemetaan zona target pada kedalaman 2095-2250 ms yaitu dengan menggunakan range cut-off Lambda-Rho 17-22 Gpa*g/cc dan Mu-Rho 20-28 Gpa*g/cc maka didapat peta persebaran batuan reservoir dan hidrokarbon. Hasil interpretasi dari peta sebaran menunjukkan sumur B-41 adalah dry hole karena lapisan batupasir mempunyai nilai Mu-Rho rendah yang diakibatkan lapisan tipis dan perselingan dengan batulempung.

Determining Velocity and Q-factor Structure using Crosshole Tomography F. Fatkhan; Andri Dian Nugraha; Ahmad Syahputra
Journal of Mathematical and Fundamental Sciences Vol. 45 No. 1 (2013)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2013.45.1.3

In this study, we have conducted a crosshole tomography survey to obtain seismic data from two boreholes on the ITB campus. The first borehole was 39 meters deep while the second was 19 meters deep. The aim of the study was to determine the subsurface velocity and Q-factor for the region between the two boreholes for geotechnical purposes. Sources of seismic waves were produced by an impulse generator and sparker and were recorded by 12 channels of borehole hydrophones. In the tomography inversion, the pseudo-bending ray tracing method was employed to calculate travel times. The initial velocity model was a 1-D model with 1x1 m2 block dimensions. The non-linear inversion problem was solved by delay-time tomography with the LSQR method. Also, a checkerboard resolution test (CRT) was conducted to evaluate the resolution of the tomography inversion. Using the velocity structure results, a LSQR Q-tomography inversion was carried out using spectral curve fitting to obtain the attenuation structure (t* values). The resulting tomogram shows that there are 3 layers, with an unconsolidated layer (down to 8 meters), a consolidated layer (from 8 meters deep to 20 meters), and bedrock (more than 20 meters). From the results, the ground water level is estimated at a depth of 14 meters.

Analisis Parameter Elastisitas Untuk Interpretasi Litologi Dan Fluida Pori Reservoir Batupasir Formasi Intra Gumai Cekungan Sumatera Selatan Eliza Veronica Zanetta; Handoyo Handoyo; Fatkhan Fatkhan; Agus Laesanpura, M.S; Harnanti Yogaputri Hutami
Jurnal Geofisika Vol 19 No 2 (2021): Special Issues | Seismic Quantitative Interpretation |Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v20i2.508

Modulus elastisitas merupakan salah satu parameter yang digunakan untuk identifikasi perbedaan litologi dan fluida pori dalam analisis reservoir batupasir tipis Formasi Intra Gumai di Cekungan Sumatera Selatan. Adapun parameter yang digunakan pada penelitian ini adalah Parameter lame (LMR), Poisson’s ratio dan . Parameter lame adalah parameter elastisitas yang menggunakan Vp dan Vs untuk diturunkan menjadi parameter LambdaRho dan MuRho. LambdaRho sensitif terhadap fluida sedangkan MuRho sensitif terhadap litologi. Poisson’s ratio merupakan pengukuran yang merepresentasikan sifat fisis batuan atau rasio dari strain transversal terhadap strain longitudinal. Teknik analisis ini akan dilakukan pada sumur EL-01. Hasil interpretasi log gamma ray, dan crossplot parameter lame pada kedalaman 1090-1120 m merepresentasikan litologi zona target sandstone. Crossplot antara Poisson’s ratio dan menunjukkan keterdapatan oil sand pada kedalaman 1100-1120 m dengan gas-sand memiliki nilai Poisson’s ratio paling rendah yaitu 0-0,21, oil sand memiliki Poisson’s ratio 0,21-0,34, Poisson’s ratio brine sand 0,34-0,39, Poisson’s ratio shale 0,39-0,45 dan Poisson’s ratio tertinggi yaitu unconsolidated shallow sediment. Sifat petrofisika yang digunakan pada penelitian ini yaitu porositas, densitas, dan . Kombinasi antara sifat petrofisika batuan dan parameter lame dapat menjadi metode optimal untuk memisahkan litologi dan kandungan fluida di dalam batuan reservoir.

Estimation of Rock Physical Parameters Based on Digital Rock Physics Image, Case Study: Blok Cepu Oil Field, Central Java, Indonesia Handoyo Handoyo; Fatkhan Fatkhan; Fourier D. E. Latief; Harnanti Y. Putri
Jurnal Geofisika Vol 16 No 1 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Modern technique to estimate of the physical properties of rocks can be done by means of digital imagingand numerical simulation, an approach known as digital rock physics (DRP: Digital Rock Physics). Digital rockphysics modeling is useful to understand microstructural parameters of rocks (pores and rock matrks), quite quickly and in detail. In this paper a study was conducted on sandstone reservoir samples in a rock formation. The core of sandstone samples were calculated porosity, permeability, and elasticity parameters in the laboratory. Then performed digital image processing using CT-Scan that utilizes X-ray tomography. The result of digital image is processed and done by calculation of digital simulation to calculate porosity, permeability, and elastic parameter of sandstones. In addition, there are also predictions of p-wave velocity and wave -S using the empirical equations given by Han (1986), Raymer (1990), and Nur (1998). The results of digital simulation (DRP) in this study provide a higher than the calculations in the laboratory. The digital rock physicsmethod (DRP) combined with rock physics modeling can be a practical and rapid method for determining the rock properties of tiny (microscopic) rock fragments

Analisis Hubungan antara Nilai Critical Porosity dan Pore Space Stiffness Terhadap Kualitas Reservoir Batupasir Lapangan ”N” Cekungan Sumatera Selatan Nahdah Novia; Handoyo Handoyo; Fatkhan Fatkhan; Agus Laesanpura; Harnanti Yoga Putri
Jurnal Geofisika Vol 19 No 2 (2021): Special Issues | Seismic Quantitative Interpretation |Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36435/jgf.v20i2.509

Kualitas batuan reservoir yang baik adalah reservoir yang memiliki nilai porositas dan permeabilitas tinggi. Parameter utama dalam menentukan kualitas batuan reservoir adalah permeabilitas. Permeabilitas dipengaruhi oleh grain size, tortuosity, dan surface area yang pada praktiknya sulit untuk dihitung. Sebagai penghubung, parameter critical porosity dan pore space stiffness digunakan untuk mengetahui kualitas reservoir yang juga berkaitan dengan elastisitas batuan. Karakterisasi parameter-parameter tersebut dilakukan dengan menggunakan data logging, data XRD, dan permeabilitas. Dengan menggunakan persamaan Zimmerman dan model Nur untuk mendapatkan nilai pore space stiffness dan critical porosity. Penelitian ini menganalisis hubungan parameter petrofisika dengan parameter elastik untuk menentukan kualitas reservoir batuan. Hasil penelitian menunjukkan bahwa hubungan permeabilitas terhadap critical porosity dan pore space stiffness mampu merepresentasikan grain size dan tortuosity suatu batuan. Kualitas reservoir yang baik menunjukkan hubungan permeabilitas berbanding terbalik dengan tortuosity dan sebanding dengan grain size berdasarkan hasil nilai dari pore space stiffness dan nilai critical porosity besar berdasarkan hasil nilai pore space stiffness dan critical porosity sumur “N1” yaitu 0.1-0.3 dan 0.28-0.45, dan nilai permeabilitas berada pada range 2-46 mD.

Digital Rock Physics Investigation in Outcrop Sandstone Reservoir . Handoyo; . Fatkhan; F. D.E. Latief; R. Rizki; H. Y. Hutami
Journal of Science and Applicative Technology Vol 2 No 1 (2019): ICoSITeR Special Edition
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Porosity and permeability of the reservoir rocks can be calculated using digital rock physics. This technique is one of the fastest and effective ways to calculate the value of porosity and permeability based on rock sample images. The samples observed in this paper were gathered from the outcrop of oil-filled sandstone formation. The technology of digital rock physics allowed us to predict the physical properties, mainly porosity and permeability, in the outcrop sandstone samples. The digital image model displayed in the 2D and 3D images and the complexity of pore geometry as well. From the image, we develop the digital simulation to predict the value of porosity and permeability in the 3D samples. By applying this method, we have confirmed that the target area of this research is potential to be a reservoir, which is porous and clean.

PREDIKSI TEKANAN PORI DENGAN DATA SEISMIK 3D DAN DATA LOG SUMUR MENGGUNAKAN METODE EATON (STUDI KASUS DI CEKUNGAN BONAPARTE UTARA) Tatang Juhatta; Agus Mochamad Ramdhan; Fatkhan Fatkhan
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.2017.1.2.4

Pore pressure prediction has important implications in determining the success of drilling activities. This thesis discusses pore pressure prediction in the northern Bonaparte Basin using wireline log data and 3D seismic interval velocity. The Eaton method is used to predict pore pressure in wells and to construct 3D model of pore pressure. Eaton method is used for pore pressure prediction, overpressure mechanism in the well and 3D model of pore pressure. Pore pressure prediction is determined by effective stress value that is obtained by the analysis of interval check-shot velocity, hydrostatic pressure is assumed to follow the gradient of 0.43 psi/ft and overburden pressure is obtained from density log data. Pore pressure prediction in 3D model is determined from 3D model of effective stress that is generated from average NCT of interval velocity of each well, the hydrostatic pressure is assumed to follow the gradient of 0.43 psi/ft and 3D model of pressure overburden generated from the 3D model density that is obtained from model 3D interval velocity by the result of Gardner transformation. The analyses of pore pressure in the well and 3D model indicate that overpressure occurs in Wangarlu Formation at the depth interval of 2000-2300 m, then it gradually reaches hydrostatic pressure in the Plover Fm. at the depth interval of 3750-3900m. Overpressure is generated by disequilibrium compaction meaning that sediments fail to compact because the expulsion of pore water is inhibited. Compression tectonic activity that occurred in the late Miocene in the north, probably contributes to increase in lateral stress that produces overpressure that spreading laterally to the south of the study area. The results of this study can be applied in the planning of drilling wells including casing design and estimation of mud weight in each depth interval that will be used during drilling.

Pengaruh literasi dan pendapatan terhadap keputusan berwakaf uang melalui LKS-PWU di Kota Surabaya Fatkhan, Fatkhan; Anwar , Moch. Khoirul
Fair Value: Jurnal Ilmiah Akuntansi dan Keuangan Vol. 5 No. 1 (2022): Fair Value: Jurnal Ilmiah Akuntansi dan Keuangan
Publisher : Departement Of Accounting, Indonesian Cooperative Institute, Indonesia

The purpose of this study was to determine the effect of literacy and income levels on cash waqf decisions at islamic financial institutions receiving cash waqf in the city of surabaya. The independent variable in this study consisted of 2 variables, namely literacy and income, while the dependent variable in this study was the decision to endow cash in lks-pwu. This study uses a quantitative method with a sample of 100 respondents. The questionnaire was distributed using right and wrong answers according to the guidelines of the indonesian waqf board ilw in measuring literacy levels. While the statements for other variables use a likert scale. The results of this study indicate that the literacy variable has an effect on the cash waqf decision variable in lks-pwu surabaya city. In addition, the income variable also affects the cash waqf decision variable in lks-pwu. The results of the coefficient of determination test (r square) show that literacy and income variables have a simultaneous effect of 37.7% on the decision to endow cash in lks-pwu.

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