石油与天然气地质2025，Vol.46Issue(6)：1823-1839,17.DOI:10.11743/ogg20250606
四川盆地侏罗系自流井组-凉高山组常-非一体多类型储层有序分布及油气成藏规律
Orderly distribution and hydrocarbon accumulation patterns of multi-type reservoirs of integrated conventional and unconventional hydrocarbons in the Jurassic Ziliujing-Lianggaoshan formations,Sichuan Basin
摘要
Abstract
In this study,we characterize the whole petroleum system(WPS)and plays in the Jurassic Ziliujing-Lianggaoshan formations of the Sichuan Basin based on the current status and recent progress in lacustrine hydrocarbon exploration of the formations.Specifically,their characteristics are determined by the combination of reservoir-forming elements,with a focus on major source rocks.Furthermore,the characteristics and source rock-reservoir coupling relationships of various types of reservoirs within the WPS are explored,the integrated accumulation patterns of both conventional and unconventional hydrocarbons are summarized,and favorable exploration targets and directions for future breakthroughs are pinpointed.The results indicate that under the control of variations in sedimentary cycles,three stages of lacustrine transgressive sedimentary systems were formed within the Ziliujing-Lianggaoshan formations.The WPS of the formations contains three plays,characterized by superior source rock conditions,favorable reservoir properties,and highly conducive hydrocarbon accumulation configurations.A binary classification criterion based on the sandstone(limestone)/gross thickness ratio and the thickness of a single sandstone(limestone)interlayer is established,addressing the challenge of defining accurate boundaries of lacustrine shale reservoirs posed by their strong lithologic heterogeneity.Based on the criterion,three types of shale reservoirs within source rocks and two types of conventional reservoirs outside source rocks are identified in the Ziliujing-Lianggaoshan formations.Specifically,the shale reservoirs are classified into laminae,interlayer,and interbed types,while the conventional reservoirs consist of tight sandstone and limestone reservoirs.The source rock-reservoir configuration characteristics of these multi-type reservoirs are established.The laminae-type shale reservoirs exhibit moderate to high hydrocarbon generation potential,a self-sourced nature,and strong hydrocarbon retention capacity.In contrast,the shale reservoirs of the interlayer and interbed types show moderate hydrocarbon generation potential,a self-sourced nature,and micro-migration.Meanwhile,the sandstone and limestone reservoirs display hydrocarbon accumulation characterized by a lower source rock-upper reservoir configuration,hydrocarbon accumulation adjacent to source rocks,and hydrocarbon transport through faults.The multi-type reservoirs in the WPS of the Jurassic Ziliujing-Lianggaoshan formations are governed by sedimentary facies zones,demonstrating an orderly spatiotemporal distribution.Specifically,from bottom upward,hydrocarbon occurrences in the formations consist of shale reservoirs of the laminae and interlayer types in the 1st sub-member of the Dongyuemiao member;interlayer-type shale reservoirs and conventional limestone reservoirs in the Da'anzhai member;and shale reservoirs of the interlayer and interlayer-interbed types,together with conventional sandstone reservoirs,in the Lianggaoshan Formation.These hydrocarbon reservoirs,occurring both inside and outside source rocks,show a distribution pattern characterized by two types laterally and three floors vertically.Overall,the multi-type reservoirs in the WPS of the Jurassic Ziliujing-Lianggaoshan formations exhibit orderly,large-scale hydrocarbon accumulation and hold considerable resource potential.These reservoirs represent integrated conventional and unconventional hydrocarbon resources,rendering three-dimensional hydrocarbon accumulation applicable.关键词
立体成藏/有序聚集/常-非一体/全油气系统/非常规油气/常规油气/自流井组-凉高山组/四川盆地分类
能源科技引用本文复制引用
魏志红,石文斌,王道军,陈超,刘晓晶,王东升,刘苗苗,黎承银..四川盆地侏罗系自流井组-凉高山组常-非一体多类型储层有序分布及油气成藏规律[J].石油与天然气地质,2025,46(6):1823-1839,17.基金项目
新型油气勘探开发国家科技重大专项(2025ZD1400400) （2025ZD1400400）
中国石化科技部项目(P25180,P23221) （P25180,P23221）
中国石化油田部重大导向项目(YTBZD-FCZY-2024-1). （YTBZD-FCZY-2024-1）
