Geophysics
Failure Mechanisms and Solutions for Fin-Pass Rolls Repair-Ring at an Electric Resistance Welding Pipe Plant

Mahammad Laribaghal; mehdi Torfi; Mehdi Khorasanian; Seyyed Reza Alavi Zaree

Volume 10, Issue 4 , October 2021, , Pages 31-42

http://dx.doi.org/10.22050/ijogst.2021.302007.1609

Abstract
  Fin-pass rolls are the latest series of rolls in electric resistance welding (ERW) pipe production lines that form the sheets to tubular shape and adjust the edges of the sheet for welding. The rolls (made of AISI 8622 steel) lose their proper function after about 10 years of operation due to severe ...  Read More

Geophysics
Simplified Automatic Seismic to Well Tying Using Smooth Dynamic Time Warping Technique in R

Afshin Amiri; Majid Bagheri; Mohammad Ali Riahi

Volume 9, Issue 4 , October 2020, , Pages 85-92

http://dx.doi.org/10.22050/ijogst.2020.234641.1552

Abstract
  Seismic well tying is a crucial part of the interpretation phase in exploration seismology. Tying wells usually involves forward modeling a synthetic seismogram from sonic and density logs and then matching the obtained synthetic seismogram to the seismic reflection data. A huge amount of time is required ...  Read More

Hydrocarbon Reservoirs Management
Geochemical Appraisal of the Depositional Environment and Source Organic Matter of Crude Oils from Some Oil Fields in Bayelsa State, Nigeria

Charles Ikenna Oraegbunam; Leo Osuji; Mudiaga Onojake; Selegha Abrakasa

Volume 9, Issue 3 , July 2020, , Pages 1-10

http://dx.doi.org/10.22050/ijogst.2020.221306.1538

Abstract
  The organic geochemical characterization of crude oil samples from the oil fields of the Niger delta was carried out using gas chromatography–-mass spectrometry (GC–-MS) to genetically characterize the oil samples in terms of their biomarker composition. Geochemical characteristics such as ...  Read More

Petroleum Engineering
Analyzing the Illumination and Resolution in Seismic Survey Designing

Sadegh Saffarzadeh; Abbdolrahim Javaherian; Hossein Hasani; Maryam Sadri

Volume 7, Issue 4 , October 2018, , Pages 1-12

http://dx.doi.org/10.22050/ijogst.2018.101878.1416

Abstract
  Seismic modeling aids the geophysicists to have a better understanding of the subsurface image before the seismic acquisition, processing, and interpretation. In this regard, seismic survey modeling is employed to make a model close to the real structure and to obtain very realistic synthetic seismic ...  Read More

Geophysics
Using a novel method for random noise reduction of seismic records

Majid Bagheri; Mohammad Ali Riahi

Volume 7, Issue 3 , July 2018, , Pages 65-72

http://dx.doi.org/10.22050/ijogst.2018.75178.1381

Abstract
  Random or incoherent noise is an important type of seismic noise, which can seriously affect the quality of the data. Therefore, decreasing the level of this category of noises is necessary for increasing the signal-to-noise ratio (SNR) of seismic records. Random noises and other events overlap each ...  Read More