Lithology identification and gross rock volume estimation of B-Sand in NIM Block, Lower Indus Basin, Pakistan

Butt, Furqan Mahmud; Naseem, Shazia

doi:10.1007/s12517-021-09381-5

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…Economical, efficient, and continuous logging data with high vertical resolution have become a crucial means for lithology identification. Previous studies plotted the crosslet by lithology-sensitive logging curves (Benoit et al, 1980;Liu et al, 2016) and identified the logging lithology using Elemental Capture Spectroscopy (ECS) logging (Wu et al, 2013), imaging logging (Lai et al, 2019), and multi-mineral model (Butt and Naseem, 2022). Crossplot has been widely used to identify the lithology of conventional reservoirs; however, it is less effective in identifying the complex lithology of tight sandstone reservoirs due to the similar logging response of complicated lithological components.…”

Section: Introductionmentioning

confidence: 99%

Resistivity correction and water saturation evaluation for calcareous tight sandstone reservoir: A case study of G oil field in Sichuan Basin

Zhang

Jia²,

Hu³

et al. 2023

Front. Earth Sci.

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The calcareous tight sandstone reservoir of the Triassic Shaximiao Formation in the G oil field of the central Sichuan Basin has high calcium content and abnormally high resistivity, making it difficult to reveal the oil-bearing property, evaluate water saturation, and calculate geological reserves. In this work, a petrophysical volume model of calcareous tight sandstone was established through systematic petrophysics experiments and the analysis of the main control factors of oil bearing grade. A method of using conventional logging data to calculate the calcium content of the reservoir and correct the calcium content of resistivity was proposed. After resistivity correction, the water saturation of the tight calcareous sandstone reservoir was more accurately calculated based on variable rock-electro parameters. The results indicated that with the decrease in calcium content and the increase in feldspar content, the reconstructive effect of corrosion was enhanced, the physical properties and pore structure of the reservoir were improved, and the oil bearing grade increased. The calcium content of the reservoir can be continuously calculated by the volume model and the crossplot of logRtn/ACn and Vca/POR. The resistivity of the reservoir with a high calcium content can be corrected using the resistivity index of calcium content (Ica). In conjunction with the water saturation calculation model using variable parameters, the accuracy of calculated water saturation was 14% and 5.8% higher than the calculation results without resistivity correction and using fixed rock-electro parameters, which can satisfy the requirements for reservoir evaluation and the calculation accuracy of hydrocarbon reserves.

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Section: Introductionmentioning

confidence: 99%

Resistivity correction and water saturation evaluation for calcareous tight sandstone reservoir: A case study of G oil field in Sichuan Basin

Zhang

Jia²,

Hu³

et al. 2023

Front. Earth Sci.

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A logging evaluation method for shale and calcium-bearing reservoirs based on the effective medium HB resistivity model—a case study on the Sartu Formation and Putaohua Formation West of the Daqing Placanticline

Zhang,

Liang,

Huang

et al. 2024

Journal of Geophysics and Engineering

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In order to solve the problems of low logging interpretation accuracy and fluid identification in shale and calcium-bearing formations in the study area, this paper uses the effective medium theory and electric double layer theory, combined with artificial core technology, to carry out the first quantitative study of the influence of calcareous on rock resistivity, and establishes a conductive model for the evaluation of the oil and gas properties of shale and calcium-bearing formations. First, considering the salt exclusion effect of clay pore water and its dispersion distribution, and an improved Berg model was established. Compared with the original Berg model, the improved Berg model achieved a higher interpretation accuracy. Second, artificial cores with different calcium and clay contents were designed and prepared using artificial core technology. A quantitative formula describing the relationship between the cementation exponent m and the calcium and clay content was established and combined with the improved Berg model to build an effective medium HB resistivity model suitable for shale and calcium-bearing formations. Finally, the hierarchical decomposition crossplot approach was used to identify the calcareous cemented rock layers, then the reservoir parameters were calculated. The new model is applied to the quantitative evaluation of reservoir logging, and the comparison with the oil test results indicates that the new model established in this paper can be applied to the quantitative evaluation of reservoir logging in this area, and the corresponding evaluation techniques provided a good reference for logging interpretation and evaluation in other corresponding areas.

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Lithology identification and gross rock volume estimation of B-Sand in NIM Block, Lower Indus Basin, Pakistan

Cited by 2 publications

References 31 publications

Resistivity correction and water saturation evaluation for calcareous tight sandstone reservoir: A case study of G oil field in Sichuan Basin

Resistivity correction and water saturation evaluation for calcareous tight sandstone reservoir: A case study of G oil field in Sichuan Basin

A logging evaluation method for shale and calcium-bearing reservoirs based on the effective medium HB resistivity model—a case study on the Sartu Formation and Putaohua Formation West of the Daqing Placanticline

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