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Open research questions in Hydrocarbon exploration and reservoir analysis

113 gap statements mined from Hydrocarbon exploration and reservoir analysis papers in our 4.5M-paper local library, which holds 1,317 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The lack of effective characterization of shale microscopic pores. The limitation of the BJH adsorption method and the BJH desorption method for characterizing microporous materials.

    Model Applicability of Characterizing Shale Pore Structure by Low-Pressure Nitrogen Adsorption Method · 2026 · DOI

  • Future research should focus on expanding the dataset to include different locations, as well as exploring the integration of this benchmark with emerging machine learning techniques.

    Lithology Classification Based on Well Log Data: A Benchmark for Machine Learning Models · 2026 · DOI

  • There is a need for a parameter-efficient model that can address these challenges. The current framework has limitations, including the use of only five conventional well-log curves.

    HyLiFT: a parameter-efficient hierarchical fusion transformer for imbalanced lithology classification in complex tectonic zones · 2026 · DOI

  • The study is limited to a single well (Sidri-14) in the Rudeis-Sidri Field. The study uses a relatively small number of core samples (215). The study does not provide a comprehensive evaluation of the entire field.

    Assessing the unconventional reservoirs of the Nukhul formation in the Rudeis-Sidri Field, Gulf of Suez: petrophysical characterization and flow unit discrimination · 2026 · DOI

  • There is no method to accurately characterize the liquid film thickness of shale nanopores with different mineral compositions. The existing methods have limitations in measuring the thickness of the adsorption layer.

    Method and application of accurate determination of nano-pore adsorption thickness in shale oil reservoir · 2026 · DOI

  • The characteristics and genesis of feldspar in shale reservoirs are not well understood. The influence of sedimentary environment on feldspar is not clearly understood. The significance of feldspar for reservoir quality evaluation is not well established.

    Quality and Genesis of Shale Reservoir Rich in Feldspar, Taking the Qiongzhusi Formation in the Sichuan Basin of China as an Example · 2026 · DOI

  • The gap is the need for a model that accounts for adsorption and gas slippage effects. The gap is the need for a study that focuses on enhanced recovery through the use of static heaters.

    Numerical Simulation of Non-Isothermal Flows in Shale Gas Reservoirs Considering Heating · 2026 · DOI

  • The reservoir characteristics of the Cambrian Qiongzhusi Formation shale are not well understood. There is a lack of a systematic classification and nomenclature system for shale laminae.

    Development Characteristics and Reservoir Significance of Laminae in the Cambrian Qiongzhusi Formation Shale in the Southern Sichuan Basin · 2026 · DOI

  • The study faced challenges in identifying and characterizing ultra-deep reservoirs due to their complex geological history and limited data availability. The reservoirs experienced diverse diagenetic processes, which made it challenging to understand their development mechanism and controlling factors.

    Development Mechanism of Ultra-Deep Effective Reservoirs in the Cretaceous Bashijiqike Formation of the Kelasu Structural Belt, Kuqa Depression, Tarim Basin · 2026 · DOI

  • There is a need to understand the development mechanism and controlling factors of effective reservoirs in ultra-deep settings.

    Development Mechanism of Ultra-Deep Effective Reservoirs in the Cretaceous Bashijiqike Formation of the Kelasu Structural Belt, Kuqa Depression, Tarim Basin · 2026 · DOI

  • Further studies can be conducted to compare the performance of machine learning models to traditional well log methods. The use of larger datasets can be explored to improve the accuracy of permeability predictions.

    Comparative Machine Learning Framework for Permeability Prediction in a Heterogeneous Carbonate Reservoir · 2026 · DOI

  • The use of traditional well logs to predict permeability in heterogeneous carbonate reservoirs remains a challenge. Many studies use small validation processes and one-model evaluations, which can give encouraging but potentially biased results.

    Comparative Machine Learning Framework for Permeability Prediction in a Heterogeneous Carbonate Reservoir · 2026 · DOI

  • The reservoir characteristics of organic-rich deep-water shelf shale with variable maturities are not fully understood. There is a need to investigate the petrographical, geochemical, and microscopic pore structure characteristics of these marine shales.

    Differences in Reservoir Characteristics of Organic-Rich Deep-Water Shelf Shale with Variable Maturities · 2026 · DOI

  • The lack of a precise understanding of the microscopic pore structure in tight sandstone reservoirs.

    Pore Structure Characterization, Classification, and Fractal Dimension Analysis of the Yanchang Formation Reservoir in the Ordos Basin—A Cue to Evaluate High-Quality Tight Sandstone Reservoirs · 2026 · DOI

  • The study uses a limited number of Kaiser calibration points. The base Biot coefficient is assumed to be α = 0.52. The study does not provide a full uncertainty propagation for the entire workflow.

    Facies-controlled geomechanical modeling for horizontal stress prediction in the Lower Cambrian carbonate reservoir, Sichuan Basin, China · 2026 · DOI

  • The lack of understanding of the complex structural-tectonic relationships in the region is a significant gap. The need for a refined understanding of the region's petroleum systems is a key gap.

    Source rocks of the External Dinarides, Croatia · 2026 · DOI

  • The complex relationships between pore-throat structure and permeability require advanced analytical techniques. The limited number of MIP samples may not be representative of the entire reservoir.

    MIP-Derived Pore-Throat Heterogeneity and Permeability Controls of Chang 8 Tight Sandstones in the South Ordos Basin, China · 2026 · DOI

  • Limited availability of well-log data in some geological settings.

    HyLiFT: a parameter-efficient hierarchical fusion transformer for imbalanced lithology classification in complex tectonic zones · 2026 · DOI

  • Further study on the application of the NLDFT method for characterizing shale samples. Investigation of the relationship between the pore structure of shale and the storage of shale gas.

    Model Applicability of Characterizing Shale Pore Structure by Low-Pressure Nitrogen Adsorption Method · 2026 · DOI

  • The lack of integrated petrophysical analysis and source rock evaluation in hydrocarbon exploration in Jordan - The need for a systematic approach to identify and delineate pay intervals in the studied…

    Reservoir assessment, source rock evaluation, and 1D basin modeling in Azraq, Dead Sea, Sirhan, Jafr, and Risha basins, Jordan · 2026 · DOI

  • Systematic comparison of reservoir differences among shales with varying laminae series, - Clarification of the controlling role of laminae development characteristics on shale reservoir…

    Development Characteristics and Reservoir Significance of Laminae in the Cambrian Qiongzhusi Formation Shale in the Southern Sichuan Basin · 2026 · DOI

  • Under the combined control of sedimentary microfacies and diagenesis, it is recommended that future exploration focus on subaqueous distributary channel sand bodies as the primary target, with priority given to transitional intervals where paleo water depths were moderate, marine transgression was frequent, but evaporation was insufficient to form extensive basal cements…

    Analysis of reservoir characteristics and controlling factors in the Enping Formation, Panyu 4 Sag, Pearl River Mouth Basin · 2026 · DOI

  • Further application of the facies-controlled geomechanical workflow to other heterogeneous reservoirs. Investigation of the uncertainty propagation for the entire workflow. Development of more advanced models incorporating additional data types.

    Facies-controlled geomechanical modeling for horizontal stress prediction in the Lower Cambrian carbonate reservoir, Sichuan Basin, China · 2026 · DOI

  • Understanding the complex structural-tectonic relationships in the region. Identifying promising remaining source rock intervals. Evaluating the thermal maturity of Jurassic and Cretaceous organic facies.

    Source rocks of the External Dinarides, Croatia · 2026 · DOI

  • The number of MIP samples is limited, - Samples were selected to cover a broad range of porosity, permeability, and lithological…

    MIP-Derived Pore-Throat Heterogeneity and Permeability Controls of Chang 8 Tight Sandstones in the South Ordos Basin, China · 2026 · DOI

Most-cited papers in Hydrocarbon exploration and reservoir analysis

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Open questions raised by papers listed on this page include: (1) The lack of effective characterization of shale microscopic pores (“Model Applicability of Characterizing Shale Pore Structure by Low-Pressure…”, 2026); (2) Future research should focus on expanding the dataset to include different locations, as well as exploring the integration of this benchmark with emerging machine learning techniques (“Lithology Classification Based on Well Log Data: A Benchmark for Machine…”, 2026); (3) There is a need for a parameter-efficient model that can address these challenges (“HyLiFT: a parameter-efficient hierarchical fusion transformer for imbalanced…”, 2026); (4) There is no method to accurately characterize the liquid film thickness of shale nanopores with different mineral compositions (“Method and application of accurate determination of nano-pore adsorption…”, 2026); (5) The characteristics and genesis of feldspar in shale reservoirs are not well understood (“Quality and Genesis of Shale Reservoir Rich in Feldspar, Taking the Qiongzhusi…”, 2026). 113 gap statements have been mined from Hydrocarbon exploration and reservoir analysis papers in our 4.5M-paper local library, which holds 1,317 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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