Organic geochemistry and organic matter enrichment mechanisms of the lacustrine source rocks from a small-faulted Basin: A case study of the Bayindulan, A'er and Wuliyasitai sags in the Erlian Basin, Northern China

Ma, Xuan; Hou, Dujie; Wu, Piao; Cheng, Xianfeng; Ding, Wenjing; Lanzhu, Cao; Wei, Xiuli; Zheng, Ronghua

doi:10.1016/j.geoen.2023.211638

Cited by 2 publications

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“…The Erlian Basin is located in northeast China and has an area of about 10 × 10 4 km 2 , with the China/Mongolia border to the north, the Daxingan Mountains to the east, and the Yinshan Mountains to the south (Figure 1a). 51 The Erlian Basin is one of the large intracontinental Meso-Cenozoic sedimentary basins, which primarily consists of five depressions, such as Manite, Wulanchabu, Wunite, Tengger, and Chuanjing Depressions, and three uplifts (Bayinbaolige, Sunite, and Wenduermiao), as shown in Figure 1a. These depressions and uplifts can be further divided into 56 sags and 21 salient.…”

Section: Geological Settingmentioning

confidence: 99%

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Insight into Fluid Occurrence and Pore Structure of Lacustrine Shale from the Cretaceous Tengger Formation, A’nan Sag, Erlian Basin, China

Xiang,

Dan,

et al. 2024

Energy Fuels

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Fluid occurrence and pore structure are prerequisites for exploring the enrichment pattern of shale oil. The Cretaceous Tengger Formation in the A'nan Sag, Erlian Basin, China, contains abundant shale oil resources. In this study, a series of NMR T 2 and T 1 −T 2 , combined with Rock-Eval, scanning electron microscopy (SEM), and low-temperature nitrogen adsorption−desorption (LTNA/D), were conducted to clarify the fluid occurrence and pore structure characteristics of the shale oil reservoirs. Meanwhile, the influences of the pore structure on fluid occurrence were discussed. Results suggest that the in situ occurrences and distributions of pore water and oil can be well analyzed by the NMR T 1 −T 2 technique combined with water and oil restorations. The selected shales are characterized by high contents of capillary-bound water and bound oil, and bound oil mainly contributes to shale oil, followed by adsorbed and movable oil. The shales at the as-received state have lost half of the capillary-bound water, as well as most of the bound and movable oil, while adsorbed oil is less affected. The pore spaces primarily consist of interparticle pores related to brittle granules, followed by intraparticle pores in clay mineral aggregates. The T 2 spectra are characterized by the dominant peak p2 ranging from 0.7 to 20 ms, corresponding to the developed mesopores (100−1000 nm). Fluid occurrence is closely related to pore structures. Capillary-bound water primarily occurs in micropores (<25 nm) and minipores (25−100 nm) and coexists with adsorbed oil. Mesopores and macropores (>1000 nm) are mainly saturated with bound and movable oil, respectively. The developed large pores generally correspond to less capillary-bound water but more shale oil, especially bound and movable oil. These findings may improve the understanding of enrichment mechanisms of shale oil and provide the references for sweet spot exploitation in the A'nan Sag, Erlian Basin.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%