Variations of sedimentary environment under cyclical aridification and impacts on eodiagenesis of tight sandstones from the late Middle Jurassic Shaximiao Formation in Central Sichuan Basin

Tan, Xianfeng; Jiang, Wei; Luo, Long; Gluyas, Jon; Song, Linke; Liu, Jianping; Qu, Xuejiao; Wang, Jia; Gao, Xuanbo; Zhang, Wei; Wang, Qiao; Chen, Long

doi:10.1016/j.marpetgeo.2024.106699

Cited by 3 publications

(1 citation statement)

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“…Differences in sand bodies and physical properties within different sedimentary microfacies lead to the differential distribution of seepage channels within the reservoir. , The FI section of well N272-268 in the south Fuyu oil layer is subdivided into seven small layers, and the FII section is subdivided into five small layers. The content of fine-grained components in the tight reservoir of the Fuyu oil layer gradually increases from the lower section to the upper section and shows positive rhythmic characteristics.…”

Section: Discussionmentioning

confidence: 99%

Characteristics and Genetic Mechanism of Effective Seepage Channels in the Tight Reservoir of the Fuyu Oil Layer in the Northern Part of the Songliao Basin

Yuan,

Tang,

Xiao

et al. 2024

Energy Fuels

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With the Fuyu oil layer in the Songliao Basin taken as the research object, this study explores the characteristics and genetic mechanism of effective seepage channels in the tight reservoir based on the identification of the characteristics of the pore–crack system and the identification of the effective seepage channels using the methods of core observation, casting thin-section observation, scanning electron microscope observation, wood alloy injection, and three-dimensional reconstruction of cores, and synthesizing the parameters of the depositional microfacies, reservoir properties, and pore–crack combination. The results showed that the seepage channels in tight reservoirs can be categorized into effective seepage channels for type I, effective seepage channels for type II, effective seepage channels for type III, and ineffective seepage channels, and their seepage capacity and their degree of development were weakened in order. The formation of effective seepage channels was influenced by the depositional environment and petrogenesis. Different types of seepage channels were formed by different diagenesis after different minerals were formed in the depositional stage.

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Section: Discussionmentioning

confidence: 99%