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Reinaldi Juniarto
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Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science

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Tomografi Seismik Menggunakan Full Waveform Inversion Pada Studi Kasus Zona Kecepatan Rendah Muhammad Akbar Najib Hidayat; Ade I.G Capah; Reinaldi Juniarto
Jurnal Migasian Vol 5 No 1 (2021): Jurnal Migasian
Publisher : LPPM Institut Teknologi Petroleum Balongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36601/jurnal-migasian.v5i1.132

Abstract

This paper investigates near surface velocity imaging in the full waveform inversion (FWI). Conventional traveltime tomography may produce inaccurate result for imaging low velocity zone. FWI compute synthetic seismic shot gathers associated with initial velocity depth model by acoustic finite difference forward modeling. The velocity model is updated by iteratively back propagate waveform residual to update velocity model. This method is applied to synthetic 2-D land data which has complex structure and low velocity zone beneath the high velocity layer. We compare near-surface velocity models derived from traveltime tomography and FWI at simple model The result is traveltime tomography produces inaccurate result for low velocity anomaly in 2-D land synthetic seismic data, than FWI. In addition, FWI can further improve the near surface velocity model which shows greater vertical and lateral resolution and reveals low velocity zone that is not present in the traveltime tomography. Near surface imaging affects the result of static correction in preprocessing stage. More accurate near surface velocity model, more satisfied the result of static correction. The pre-stack time migration (PSTM) section using statics from FWI model led to more accurate time imaging results compared to PSTM section using traveltime tomography velocity model. Nowadays, in the oil and gas industry, the exploration of hydrocarbon is located in complex structure. FWI is a high-end method and needed to produce seismic image accurately.
Analisa Geopressure Pada Sumur Gas Lapangan Sumatera Utara Untuk Evaluasi Problem Partial Loss Pada Trayek 8 ½" Ade Indra Gurada Capah; Muhammad Akbar Najib; Reinaldi Juniarto
Jurnal Migasian Vol 4 No 2 (2020): Jurnal Migasian
Publisher : LPPM Institut Teknologi Petroleum Balongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36601/jurnal-migasian.v4i2.137

Abstract

The drilling of well “X” experienced a delay in reaching the target due to obstacles. Most of the non-productive time is caused by problems of well instability such as partial loss. well instability occurs when the mudweight used does not match the geopressure model of the well so that it is not optimal. The use of mudweight in well "X" is based on the geopressure model without a safe mud window approach from the nearest well where the well is located far enough away that it is less relevant to be used as a reference. Mudweights used are 14.5 - 14.9 ppg on the trajectory hole 8 1/2 ". Geopressure analysis is carried out using the help of Drillwork Predict Software. Geopressure components to be estimated are overburden pressure, pore pressure, fracture pressure, horizontal stresses and collapse pressure. After analyzing the geopressure model, the safe mud window can be identified, and analysis of the drilling problems that occur by examining the actual mudweight usage data and formation lithology data can be done. The optimal mud weight to minimize well instability must be greater than collapse pressure but not more than the minimum in situ stress. From the results of the geopressure analysis carried out, it can be concluded that there is overpressure at a depth of 890 m / 1279.5 ft due to disequilibrium compaction. On trajectory hole 8 1 / 2 "the mud weight used is too large, causing partial loss. Based on the safe mud window obtained from geopressure analysis of well X, the optimal mud weight design is 14.67 - 15.4 ppg for drilling on the trajectory hole 8 1/2 ".
Co-Authors Ade I.G Capah Ade Indra Gurada Capah Muhammad Akbar Najib Muhammad Akbar Najib Hidayat