A combined method for gas-bearing layer identification in a complex sandstone reservoir

Xing, Donghui; Fan, Yiren; Lu, Hongfeng; Liu, Cheng; Zhang, Peng; Li, Hui; Ding, Yi

doi:10.3389/feart.2022.942895

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…In terms of fluid identification by array acoustic logging, array acoustic logging can directly measure the P-wave velocity and S-wave velocity of reservoir rock and can calculate the elastic parameters reflecting the comprehensive properties of skeleton and pore fluid. When the rock is full of different fluids, the values of elastic parameters are also different, which is the theoretical basis of fluid identification by array acoustic logging [24][25][26]. Array acoustic logging has great advantages in the identification of gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Fluid Identification Method of Nuclear Magnetic Resonance and Array Acoustic Logging for Complex Oil and Water Layers in Tight Sandstone Reservoir

Bai,

Tan,

et al. 2023

Processes

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In order to improve the logging interpretation accuracy for complex oil and water layers developed in tight sandstone reservoirs, this study takes the Chang 8 member of the Yanchang Formation in the Huanxian area as the research object, and two new fluid identification methods were constructed based on nuclear magnetic resonance (NMR) logging and array acoustic logging. Firstly, the reservoir characteristics of physical properties and conductivity were studied in the research area, and the limitations of conventional logging methods in identifying complex oil and water layers were clarified. Then, the sensitive parameters for identifying different pore fluids were established by analyzing the relationship between NMR logging and array acoustic logging with different pore fluids. On this basis, the fluid identification plate, composed of movable fluid apparent diffusion coefficient and effective porosity difference (Da-Δφe) by NMR logging data of D9TWE3 observation mode, and the other fluid identification plate, composed of apparent bulk modulus of pore fluid and elastic parameter sensitive factor (Kf-Fac), were constructed, respectively. Finally, these two fluid identification methods were used for reservoir interpretation of actual logging data. This study shows that the two new fluid identification methods constructed by NMR logging and array acoustic logging can effectively eliminate the interference of rock skeleton on logging interpretation, which make them more effective in identifying complex oil and water layers than the conventional logging method. Additionally, the two methods have their own advantages and disadvantages when used separately for interpreting complex oil and water layers, and the comprehensive interpretation of the two methods provides a technical development direction for further improving the accuracy of logging the interpretation of complex oil and water layers.

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Section: Introductionmentioning

confidence: 99%

Fluid Identification Method of Nuclear Magnetic Resonance and Array Acoustic Logging for Complex Oil and Water Layers in Tight Sandstone Reservoir

Bai,

Tan,

et al. 2023

Processes

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Editorial: Gas hydrate appearance, accumulation, exploration and exploitation in continental margins

Guan²,

Wan³

et al. 2023

Front. Earth Sci.

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Editorial on the Research Topic Gas hydrate appearance, accumulation, exploration and exploitation in continental margins Gas hydrate (GH) is so fascinating whether in exploring natural principle of geological evolution or for pursuing economic benefits of human sustainable development. GH plays an essential role in global carbon cycle and climate change. Two prominent events, the Paleocene-Eocene thermal maximum (PETM) and the three submarine Storegga Slides off Norway's continental shelf, are typical consequences subjected to GH dissociation with scales from global continental to local shelf (Paull et al., 2007;Ruppel and Kessler, 2017). Spanning from cold Alaska and Siberia permafrost zones, to busy merchant nautical routes in warm seas, like the north South China Sea (SCS), Nankai Trough, northeast India Ocean, and northern Gulf of Mexico, many governments and petroleum companies pay great interests on utilizing the huge resource potential of GHs.Our Research Topic is divided into two format-separate and content-coherent volumes, aims to deepen theoretical cognition and broaden technological applications on the exploration and exploitation of GH-bearing sediments, including the appearance, accumulation, and abundance. A total of 30 research papers and abstracts publishing in this topic present exciting and distinguishing detections and conceptions on understanding the properties of GHs.General natural principles of geology, geochemistry and geophysics are extensively adopted to explore GH-related system in fields. Ai et al. (2022), Feng C. et al., Feng J. et al. (2022), and Kong et al. (2022 focus on the records of methanogenesis and anaerobic oxidation of methane in shallow sediments and investigate related methane seepage activities in northern SCS. ), Liu et al., Song et al. and Xing et al. (2022 use in-situ seismic and logging data and drilling cores to investigate the existence and characteristics of GH in sediments. In addition, many authors theoretically evaluate the influence of sedimentary geological structure on the accumulation of free gases and hydrates (

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Logging Identification Methods for Oil-Bearing Formations in the Chang 6 Tight Sandstone Reservoir in the Qingcheng Area, Ordos Basin

Ge,

Zhao,

Niu

et al. 2024

Energies

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The Chang 6 sandstone reservoir of the Upper Triassic Yanchang Formation in the Ordos Basin is one of the tight-oil-rich intervals in the basin. Owing to the strong heterogeneity and complex lithology of the Chang 6 reservoir, lithology and fluid identification have become more challenging, hindering exploration and development. This study focused on the Chang 6 member in the Qingcheng area of the Ordos Basin to systematically analyze the lithology, physical properties, and oil-bearing properties of the Chang 6 reservoir. We adopted the method of normalized superposition of neutron and acoustic time-difference curves, the method of induced conductivity–porosity–density intersection analysis, the method of superposition of difference curves (Δφ), and the induced conductivity curve. Our results indicated that the method of normalized superposition of neutron and acoustic wave time-difference curves could quickly and effectively identify the lithologies of tight fine sandstone, silty mudstone, mudstone, and carbonaceous mudstone. The induced conductivity–porosity–density cross-plot could be used to effectively identify oil and water layers, wherein the conductivity of tight oil layers ranged from 18 to 28.1 mS/m, the density ranged from 2.42 to 2.56 g/cm3, the porosity was more than 9.5%, and the oil saturation was more than 65%. Based on the identification of tight fine sandstone using the dual-curve normalized superposition method, the oil layer thickness within the tight fine sandstone could be effectively identified using the superposition of difference curves (Δφ) and induced conductivity curves. Verified by oil-bearing reservoir data from the field test, the overall recognition accuracy of the plots exceeded 90%, effectively enabling the identification of reservoir lithology and fluid types and the determination of the actual thickness of oil layers. Our results provide a reference for predicting favorable areas in the study area and other tight reservoirs.

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A combined method for gas-bearing layer identification in a complex sandstone reservoir

Cited by 3 publications

References 24 publications

Fluid Identification Method of Nuclear Magnetic Resonance and Array Acoustic Logging for Complex Oil and Water Layers in Tight Sandstone Reservoir

Fluid Identification Method of Nuclear Magnetic Resonance and Array Acoustic Logging for Complex Oil and Water Layers in Tight Sandstone Reservoir

Editorial: Gas hydrate appearance, accumulation, exploration and exploitation in continental margins

Logging Identification Methods for Oil-Bearing Formations in the Chang 6 Tight Sandstone Reservoir in the Qingcheng Area, Ordos Basin

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