A technique for improving pseudo-synthetic seismograms generated from neutron logs in gas-saturated clastic rocks

Kung, Shih-Ling; Lewis, Charles; Wu, Jong-Chang

doi:10.1088/1742-2132/10/3/035015

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Neutron and density logs typically show notable changes within the flushed zone, though the precise depth at which this occurs depends on the porosity [54,55]. See Table 1 and Table 2 for ways to estimate each parameter's porosity and proposed fluid and matrix properties.…”

Section: Fig 2 Well Log Environmental Corrections Results From the Sa...mentioning

confidence: 99%

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Jassam,

AL-Fatlawi,

Canbaz

2023

IJCPE

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Carbonate reservoirs are an essential source of hydrocarbons worldwide, and their petrophysical properties play a crucial role in hydrocarbon production. Carbonate reservoirs' most critical petrophysical properties are porosity, permeability, and water saturation. A tight reservoir refers to a reservoir with low porosity and permeability, which means it is difficult for fluids to move from one side to another. This study's primary goal is to evaluate reservoir properties and lithological identification of the SADI Formation in the Halfaya oil field. It is considered one of Iraq's most significant oilfields, 35 km south of Amarah. The Sadi formation consists of four units: A, B1, B2, and B3. Sadi A was excluded as it was not filled with hydrocarbons. The structural and petrophysical models were built based on data gathered from five oil wells. The data from the available well logs, including RHOB, NPHI, SONIC, Gamma-ray, Caliper, and resistivity logs, was used to calculate the petrophysical properties. These logs were analyzed and corrected for environmental factors using IP V3.5 software. where the average formation water resistivity (Rw = 0.04), average mud filtrate resistivity (Rmf = 0.06), and Archie's parameters (m = 2, n = 1.9, and a = 1) were determined. The well-log data values calculated the porosity, permeability, water saturation, and net-to-gross thickness ratio (N/G).

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Section: Fig 2 Well Log Environmental Corrections Results From the Sa...mentioning

confidence: 99%

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Jassam,

AL-Fatlawi,

Canbaz

2023

IJCPE

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“…Quadir et al [6] tried to create pseudo synthetic seismogram using gamma ray logs in highly radioactive sands. Kung et al [7] also proposed a technique which basically involves conversion of neutron logs to pseudo sonic logs for the generation of synthetic seismogram in gas saturated clastic rocks. Although there exist some limitations, their results reveal that their objective is empirically and better results can be achieved by treating gas saturated zones in isolation.…”

Section: Introductionmentioning

confidence: 99%

Generating Pseudo-Synthetic Seismogram with Resistivity Logs Considering the Effect of Gas: Application to Bizzy Field, Onshore, Niger-Delta, Nigeria

Kafisanwo¹,

Abe²,

Falade³

2019

EESRJ

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Traditionally, sonic and density logs are vital components during the generation of synthetic seismogram. However, sonic logs as observed in many studies, often have poor quality or even absent in some cases. This work is a case study for the transformation of resistivity logs to pseudo sonic logs for the generation of pseudo synthetic seismogram considering the effect of gas. This research studies the relationship between resistivity and sonic logs in order to utilize the former for the generation of pseudo synthetics when sonic log is absent or poor. Standard synthetic seismograms were first created conventionally using sonic and density logs as inputs. The sonic log values were then plotted against the corresponding resistivity values for each well to derive their relationship using both linear and polynomial functions. Generally, the crossplot shows a fair correlation but some scattered plots were observed. Further probe into these observed anomalies revealed the areas to be gas saturated. A better correlation was achieved within affected zones by doing independent crossplots for previously gas delineated units. The standard synthetic generated were used as control for the pseudo synthetics and better correlation is observed when compared with the previous pseudo synthetics that does not acknowledge gas-effect.

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The Spontaneous Ray Log: A New Aid for Constructing Pseudo-Synthetic Seismograms

Quadir

Lewis

Rau

2018

Pure Appl. Geophys.

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A technique for improving pseudo-synthetic seismograms generated from neutron logs in gas-saturated clastic rocks

Cited by 4 publications

References 8 publications

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Petrophysical Analysis Based on Well Logging Data for Tight Carbonate Reservoir: The SADI Formation Case in Halfaya Oil Field

Generating Pseudo-Synthetic Seismogram with Resistivity Logs Considering the Effect of Gas: Application to Bizzy Field, Onshore, Niger-Delta, Nigeria

The Spontaneous Ray Log: A New Aid for Constructing Pseudo-Synthetic Seismograms

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