Natural Gas Accumulation Mechanisms and Exploration Directions of Ancient Reservoirs in the Sichuan Basin Under Multi-Stage Tectonic Backgrounds

doi:10.11885/j.issn.1674-5086.2024.10.17.02

Abstract

Abstract: To deepen understanding of the Sinian-Cambrian gas enrichment in the Sichuan Basin and expand exploration fairways, this study of the Dengying Formation documents reservoir types and fluid properties under multiple tectonic episodes and quantifies their regional variability. Recurrent deformation generated structural, lithologic and stratigraphic-lithologic composite traps. Extensional intracratonic sags evolved into hydrocarbon kitchens that contain thicker, higher-quality source rocks. The basin interior retains a closed formation-water system, excellent preservation and high gas saturation, whereas the marginal zones retains open meteoric flux, weaker preservation and low saturation. Four accumulation styles are recognized: primary accumulation in Anyue where a paleo-oil pool cracked in situ; residual accumulation in Ziyang where cracked hydrocarbons migrated and were partly stranded; adjusted accumulation in Weiyuan where remigration led to entrapment elsewhere; and destroyed accumulation in Sangmuchang where the paleo-pool was breached and dispersed. Primary accumulations exhibit the most favourable formation and preservation conditions, followed by adjusted ones. Tectonic stability is the key control on gas retention in these ancient strata; the northern and southern slopes of the central Sichuan paleo-uplift are the premier fairways for primary and adjusted pools and constitute the focus of future exploration.

Key words: natural gas, tectonic movement, hydrocarbon generation evolution, petroleum accumulation evolution, Sinian Dengying Formation, Sichuan Basin

CLC Number:

TE121

TANG Yuxin, XIAO Di, ZHAO Like, LUO Bing, ZHOU Gang, HU Guang. Natural Gas Accumulation Mechanisms and Exploration Directions of Ancient Reservoirs in the Sichuan Basin Under Multi-Stage Tectonic Backgrounds[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(5): 49-61.

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