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<p>The Upper Jurassic Penglaizhen Formation in the western Sichuan Basin represents shallow-water deltaic distributary channel deposits, which are relatively thinly bedded and overlain by various superimposed deposits. This complex interlayering makes it challenging to delineate the precise distribution of the distributary channels. To address this issue, the current study employed logging data interpretation and seismic sedimentology techniques to investigate comprehensively the reservoir characteristics within the distributary channels. Building on the results of hundreds of well-logging facies analyses and the establishment of isochronous stratigraphic framework of the JP4 Member, this study identified the characteristics of the channels, sedimentary microfacies, and potential reservoir distribution through a series of analyses, including 90-degree phase conversion, formation slicing (10 in all), seismic attribute analysis, frequency division RGB (red–green–blue) attribute fusion (each 15&#xa0;Hz), waveform clustering, and a holistic review. High-quality reservoirs with good gas content exhibited low wave impedance characteristics, and the fitting results showed a linear relationship (0.8507) between wave impedance values and reservoir thickness. The findings confirm that four distributary channels of the Penglaizhen Formation are predominantly oriented in a NE–SW direction, with three main channels exhibiting thick sandstone successions (10–20&#xa0;m) and commendable physical properties, making this formation an attractive prospect for exploration.</p>

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High-Resolution Prediction of Thin-Layer Reservoirs Based on Seismic Sedimentology: A Case Study of the Penglaizhen Formation, Western Sichuan Basin, China

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Gang Lu,
  • Changcheng Wang,
  • Xiaobing Zhang,
  • Xihe Lu,
  • Ruochen Tang,
  • Sheng Zhang,
  • Zheng Wang

摘要

The Upper Jurassic Penglaizhen Formation in the western Sichuan Basin represents shallow-water deltaic distributary channel deposits, which are relatively thinly bedded and overlain by various superimposed deposits. This complex interlayering makes it challenging to delineate the precise distribution of the distributary channels. To address this issue, the current study employed logging data interpretation and seismic sedimentology techniques to investigate comprehensively the reservoir characteristics within the distributary channels. Building on the results of hundreds of well-logging facies analyses and the establishment of isochronous stratigraphic framework of the JP4 Member, this study identified the characteristics of the channels, sedimentary microfacies, and potential reservoir distribution through a series of analyses, including 90-degree phase conversion, formation slicing (10 in all), seismic attribute analysis, frequency division RGB (red–green–blue) attribute fusion (each 15 Hz), waveform clustering, and a holistic review. High-quality reservoirs with good gas content exhibited low wave impedance characteristics, and the fitting results showed a linear relationship (0.8507) between wave impedance values and reservoir thickness. The findings confirm that four distributary channels of the Penglaizhen Formation are predominantly oriented in a NE–SW direction, with three main channels exhibiting thick sandstone successions (10–20 m) and commendable physical properties, making this formation an attractive prospect for exploration.