| Citation: | WANG Huijun，YANG Rui，SHU Zhiguo，et al. Quantitative evaluation of hydrocarbon generation, expulsion, and retention potential in deep Permian Wuchiaping shale gas reservoir, southeastern Sichuan Basin[J]. Bulletin of Geological Science and Technology，2025，44（6）：1-14 doi: 10.19509/j.cnki.dzkq.tb20250224
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Quantitative characterization of hydrocarbon generation, expulsion, and retention intensity in high to over-mature shale gas reservoirs represents a critical scientific challenge for deep resource evaluation. The Permian Wuchiaping Formation (Wu Second Member) shale gas reservoir in the Hongxing area, southeastern Sichuan Basin (with proven reserves exceeding 1011 m3), presents complex geological characteristics including thin-layer distribution, strong heterogeneity, and multi-stage tectonic modification, making it difficult to precisely characterize the spatiotemporal evolution of hydrocarbon generation-expulsion-retention processes using traditional evaluation methods.
This study established a multi-dimensional evaluation system integrating thermal simulation experiments, hydrocarbon potential methods, and generation kinetic modeling with mutual verification to systematically reconstruct the complete evolutionary model of the Wu Second Member shale gas reservoir from hydrocarbon generation to preservation, enabling quantitative characterization and spatial prediction of resource potential.
Thermal simulation results indicate that the total hydrocarbon generation rate of the studied samples reached 456 mg/g TOC, including total gas generation of 349.68 mg/g TOC (76.7%) and total oil generation of 106.59 mg/g TOC (23.3%); oil-phase products were primarily expelled (103.35 mg/g TOC) with minimal retention (3.24 mg/g TOC). Hydrocarbon potential evaluation revealed that Wu Second Member shale entered the hydrocarbon generation threshold at Ro=0.5% and the expulsion threshold at Ro=0.8%, with an original hydrocarbon generation potential index reaching 550 mg/g. The present-day generation, expulsion, and retention intensities in the Hongxing area and surrounding regions reached maximum values of 90×108 m3/km2, 68×108 m3/km2, and 28×108 m3/km2, respectively, with high spatial coupling of their centers primarily concentrated in three key areas: Wanzhou-Hongxing-Enshi. Hydrocarbon generation kinetic modeling further revealed that the peak gas generation intensity in the study area could reach 50×108 m3/km2, with maximum gas retention intensity of 16×108 m3/km2. Through comprehensive analysis of key preservation factors including burial depth, structural stability, and sealing capacity, the present-day residual gas intensity distribution pattern was quantitatively determined, confirming the Hongxing-Wanzhou region as the optimal exploration target area.
This study not only elucidates the spatiotemporal evolution patterns of hydrocarbon generation, expulsion, and retention in the Permian shale gas reservoir of the Sichuan Basin but also provides theoretical foundation and practical guidance for refined exploration of deep to ultra-deep shale gas reservoirs.
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