Early Cretaceous palynology and paleoclimate of the Hanxia-Hongliuxia Area, Jiuxi Basin, China

Jin, Peihong; Ji, Liming; Ma, Bing‐Ji; Yuan, Bochao; Long, Liwen

doi:10.1016/j.revpalbo.2020.104259

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…Jiuquan Basin is divided into two depressions by the Jiayuguan Uplift [28,29]; the east to west basin area is divided into two depressions of Jiudong and Jiuxi. The area of the Jiudong depression measures 1:1 × 10 4 km 2 , whereas the Jiuxi depression features a smaller area of 0:68 × 10 4 km 2 and the three mainly sedimentary developed sags of Qingxi, Shida, and Huahai [30,31] (Figure 1). The Qingxi Sag in the research area is positioned in the western Jiuxi depression and features a rhombic shape distributed along the northwest direction [32].…”

Section: Geologic Settingmentioning

confidence: 99%

Pore Structure Characteristics of Tight Carbonate Reservoir in Qingxi Sag, Jiuquan Basin

et al. 2021

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The Xiagou Formation is the main tight oil reservoir in Qingxi Sag of Jiuquan Basin. Given the poor physical properties and other factors restricting tight oil exploitation and production in this area, studies should focus on microscopic pore structure characteristics. In this study, a nano-CT scanner, a SEM, and an NMR were used to study the pore structure characteristics of a tight carbonate reservoir in Qingxi Sag, Jiuquan Basin. The Xiagou Formation reservoir mainly consists of gray argillaceous dolomite and dolomitic mudstone. The pore categories are mainly elliptic, irregular, intergranular, and intragranular and mostly filled with clay and carbonate cement. Pore space is small, the intergranular or organic pores are mostly separated, and pore-throat is weakly connected. The throats mostly develop with lamellar and tube bundle-like characteristics and with poor seepage ability. The pore-throats mostly span from nanometer to micrometer sizes, and pore diameters are mainly concentrated in the range of 0.01–0.1 and 1–10 μm. It is a unimodal pattern mainly composed of micropores, or a bimodal regular allocation dominated by micropores supplemented by macropores. The relationship between micropore (<0.1 μm) and macropore (>1 μm) content allocation and mean pore diameter strongly controls the permeability of reservoir rocks. When macropore content reaches more than 85%, or when pore content totals less than 3%, the permeability of a reservoir remarkably increases. At a higher ratio of the average finest throat sectional area and throat-pore of reservoir rock, the throat radius lies closer to the connecting pore radius, pore and throat connectivity improves, and reservoir seepage ability becomes stronger. Based on reservoir capacity and seepage ability, pore structures of the tight carbonate reservoirs in study area are classified into type I (small-pore–thin-throat), type II (thin-pore–thin-throat), and type III (microporous-microthroat) with rock permeability>0.1 mD, 0.05–0.1 mD, and <0.05 mD, respectively. The type I pore structure reservoir should be regarded as an indicator of tight oil “sweet spots” reservoir in the study area.

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Section: Geologic Settingmentioning

confidence: 99%

Pore Structure Characteristics of Tight Carbonate Reservoir in Qingxi Sag, Jiuquan Basin

et al. 2021

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“…In addition, D. R. Zheng et al (2021) reports a novel zircon U–Pb age constraint of 112.4 ± 0.3 Ma for a basalt sample from the lowermost Zhonggou Formation (Li et al, 2013; D. R. Zheng et al, 2021). The age of the Zhonggou Formation is thought to be late Aptian to early Albian based on zircon dating and fossil evidences, such as macro‐plant fossil assemblages, spore‐pollen assemblages, and the discovery of dragonfly fossils (Deng et al, 2005; Deng & Lu, 2008; Du et al, 2013, 2015; Jin, Ji, Ma, Yuan, & Long, 2020; Z. S. Liu, 2000; M. Z. Zhang, Ji, Du, Dai, & Hou, 2015).…”

Section: Methodsmentioning

confidence: 99%

Fossil Pagiophyllum from the Lower Cretaceous of Jiuquan Basin, Gansu Province, and its palaeoenvironmental implications

Lei

et al. 2021

Geological Journal

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Pagiophyllum compressum (Deng and Lu) was described based on the leaf morphological and cuticular features from the Lower Cretaceous (late Aptian—early Albian) Zhonggou Formation of Jiuquan Basin, Gansu Province, North‐west China. P. compressum has helically and tightly arranged leaves appressed on the ultimate shoots, which are imbricated shapes. The epidermal cells are square or rectangular, without papillae on the periclinal walls. The stomatal apparatus is elliptic and composed of 4–7 subsidiary cells arranged in two or three longitudinal rows on the middle part of the leaves. The present specimens may be related to Araucariaceae based on the cluster analysis of morphological features. By summarizing the global distribution of the Pagiophyllum in the Late Jurassic and Cretaceous, it has been found that Pagiophyllum can live in both tropical‐equatorial hot arid belt and humid climate zone of middle and high latitudes, confirming that Pagiophyllum has an extensive habitat.

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Geochemical constraints for unravelling the conditions of sedimentation, Paleoclimate variations, and provenance and metallogenic implication of the Cretaceous sequence deposits along the Mayo Louti, Babouri-Figuil Basin (North Cameroon, Africa)

Takou,

Sobdjou-Kemteu,

Tchouatcha

et al. 2024

Arab J Geosci

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Early Cretaceous palynology and paleoclimate of the Hanxia-Hongliuxia Area, Jiuxi Basin, China

Cited by 12 publications

References 30 publications

Pore Structure Characteristics of Tight Carbonate Reservoir in Qingxi Sag, Jiuquan Basin

Pore Structure Characteristics of Tight Carbonate Reservoir in Qingxi Sag, Jiuquan Basin

Fossil Pagiophyllum from the Lower Cretaceous of Jiuquan Basin, Gansu Province, and its palaeoenvironmental implications

Geochemical constraints for unravelling the conditions of sedimentation, Paleoclimate variations, and provenance and metallogenic implication of the Cretaceous sequence deposits along the Mayo Louti, Babouri-Figuil Basin (North Cameroon, Africa)

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