Abstract
The current findings emphasize interpreting wireline logs to assess the hydrocarbon prospect of the Lower Cretaceous Yageliemu Formation in the Yakela (YKL) gas condensate field, Tarim Basin, China. The present study consists of wireline logs of four drilled wells (S4, YK13, YK21, and YK32) and numerous reservoir zones have been comprehended. According to the petrophysical evaluation, the gas-bearing zone has high resistivity values, good porosity (Φeff) and permeability (K), low water content (Sw), and less shale content (Vsh) indicating clean sand. The petrophysical parameters of the interest zones were closely studied which are classed as good-quality sand layers with ranging effective porosities from 4.5 to 10%, permeability ranging from 0.5 to 18 mD, water saturation concentrations ranging from 55 to 59%, and the average value gas is 41–50%. The Archie equation was accurately tested to estimate water saturation in the reservoirs, revealing that in each well, Sw is less than 60%; therefore, the efficiency of the gas-bearing sand is of good quality. Lithofacies, horizontal and vertical variations of reservoir parameters, are evaluated through building self-organizing maps, isoparametric maps of the petrophysical parameters, and litho-saturation cross-plots, respectively. Isoparametric maps assist in visualizing the spatial distribution of the reservoir configuration. It is suggested that more wells be drilled in the southwestern and northwestern parts of the current research area. Due to the high water concentration and shale volume, the northeastern and southeastern portions of the understudied area must be overlooked.
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Abbreviations
- a:
-
Tortuosity factors
- AC:
-
Acoustic log (μsec/ft)
- ANN:
-
Artificial neural network
- Bulkvw:
-
Bulk volume of water
- BS:
-
Bit size (inch)
- CALI:
-
Caliper log (inch)
- Den:
-
Density log (gm/cm3)
- GR:
-
Gamma ray log (API)
- GRmin:
-
Minimum gamma ray log response (clean sandstone)
- GRmax:
-
Maximum gamma ray log response (100% shale)
- IGR:
-
Gamma ray index
- K:
-
Permeability
- m:
-
Cementation exponent
- n:
-
Saturation exponent
- NPHI:
-
Neutron porosity log (p.u)
- RILD:
-
Deep resistivity (ohm)
- RILM:
-
Medium resistivity (ohm)
- RFOC:
-
Shallow resistivity (ohm)
- Rw :
-
Water resistivity (ohm)
- Rt:
-
True formation resistivity (ohm)
- Sg:
-
Gas saturation (%)
- Sw:
-
Water saturation (%)
- SOFM:
-
Self-organizing feature map
- SP:
-
Spontaneous potential log (mV)
- Sw :
-
Water saturation (%)
- ∅T:
-
Total porosity
- ∅eff:
-
Effective porosity
- Vsh:
-
Shale volume
- S04:
-
S04 (well name)
- YKL:
-
Yakela (gas field name)
- YK13:
-
Yakela13 (well name)
- YK21:
-
Yakela21 (well name)
- YK32:
-
Yakela32 (well name)
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Acknowledgements
I am thankful to Dr. Izhar Sadiq (Ocean College, Zhejiang University, People’s Republic of China) for reading and commenting on the manuscript, which helped improve the article.
Funding
The authors wish to thank the fluid flow lab of Faculty Earth Resources and School Oil and the Gas Engineering Department, China University of Geosciences, Wuhan, for the financial support that made this work possible.
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Highlights
• Well-log data are used to characterize the Lower Cretaceous Yageliemu Formation.
• The range of effective porosity has been calculated as 4.5–10%.
• Permeability is 0.5–18 mD, recognizing the well-sorted nature of sand.
• Hydrocarbon saturation in the respective zones is 41 to 50%.
• The Yageliemu Formation reservoir can produce a considerable amount of hydrocarbon.
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Hussain, W., Pan, L., Wang, X. et al. Evaluation of unconventional hydrocarbon reserves using petrophysical analysis to characterize the Yageliemu Formation in the Yakela gas condensate field, Tarim Basin, China. Arab J Geosci 15, 1635 (2022). https://doi.org/10.1007/s12517-022-10902-z
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DOI: https://doi.org/10.1007/s12517-022-10902-z