Silurian hydrocarbon exploration breakthrough and its implications in the Shajingzi structural belt of Tarim Basin, NW China

Zhang, Junfeng; Zhang, Yuanyin; Gao, Yongjin

doi:10.1016/s1876-3804(22)60019-3

Cited by 8 publications

(10 citation statements)

References 6 publications

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“…The Shajingzi Belt is located in the southeast of Wensu salient, which is classified as the secondary tectonic unit in the northwest Tarim Basin and belongs to a typical basin-range junction belt (Zhang et al, 2022). It strikes in the northeast-southwest direction and was defined mainly by three boundary faults including the Karayuergun Fault in the north, the Yingan Fault in the south, and the Shajingzi Fault in the southeast, respectively (Figure 1A-C).…”

Section: Geological Settingmentioning

confidence: 99%

“…It strikes in the northeast-southwest direction and was defined mainly by three boundary faults including the Karayuergun Fault in the north, the Yingan Fault in the south, and the Shajingzi Fault in the southeast, respectively (Figure 1A-C). The Shajingzi Fault accompanied with numerous secondary faults is regarded as the boundary between the Wensu Salient and the Awati Sag (Jia, 2005;Wang et al, 2009;Li et al, 2013;Qi et al, 2014;Zhang et al, 2022) (Figure 1C). Approximately, the fracture systems involve deep wedge-shaped thrusts, Shajingzi Fault in a narrow sense (painted in Figure 2), and shallow extensional faults as a whole (Li et al, 2013;Qi et al, 2014;Zhang et al, 2022).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Shajingzi Fault accompanied with numerous secondary faults is regarded as the boundary between the Wensu Salient and the Awati Sag (Jia, 2005;Wang et al, 2009;Li et al, 2013;Qi et al, 2014;Zhang et al, 2022) (Figure 1C). Approximately, the fracture systems involve deep wedge-shaped thrusts, Shajingzi Fault in a narrow sense (painted in Figure 2), and shallow extensional faults as a whole (Li et al, 2013;Qi et al, 2014;Zhang et al, 2022).…”

Section: Geological Settingmentioning

confidence: 99%

“…Silurian in this area is often divided into four members: the upper Keziertag Formation ((S 3 -D 1 )k), the middle Yimugantawu Formation (S 2 y), the lower Tata Ertag Formation (S 1 t), and the Kepingtage Formation (S 1 k), respectively (Wang et al, 2007;Wu et al, 2011;Zhang et al, 2022). As the most significant oil and gas bearing member, the Kepingtage Formation in particular is mainly composed of gray green and dark gray fine sandstone and argillaceous siltstone.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Silurian bituminous sandstone reservoirs in the Tarim Basin, China, is widely distributed but has only submitted 3P oil reserves of 8011.97×10 4 t in Tazhong and Tabei areas until 2020 (Zhang et al, 2022). In particular, the hydrocarbon exploration degree in the northwest basin-range junction belt is comparably unsatisfactory.…”

Section: Introdutionmentioning

confidence: 99%

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Characteristics and Accumulation Model of Silurian Tight Sandstone Gas Reservoir: A Case Study in the Shajingzi Belt, Northwest Tarim Basin, China

Zhang

Gao

et al. 2022

Front. Earth Sci.

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The first industrial gas flow has been recently achieved in the Shajingzi Belt, northwest Tarim Basin, China, although that area is always characterized as a monoclinic structure background, typical tight bituminous sandstones, and poor hydrocarbon accumulation conditions. Based on drilling, oil testing, geophysics, geological, and geochemical data, a comprehensive research including reservoir description, hydrocarbon tracing, and accumulation history analysis in the Shajingzi Belt was carefully conducted to establish a meaningful Silurian hydrocarbon accumulation model and discover potential areas in this study. It is found that 1) the Silurian reservoirs in the Shajingzi Belt mainly bear gas and could be defined as the typical tight sandstone reservoir with ultralow porosity generally less than 10% and low-permeability distributed between 0.1 and 10 mD, respectively; 2) petroleum substantially comes from the Cambrian–Ordovician source rocks, especially in the Awati Sag, possessing the dominant contribution from the shales in Cambrian Yuertusi Formation; 3) synthetically, three major hydrocarbon accumulation periods can be determined in the Shajingzi Belt, namely, the Late Caledonian, the Late Hercynian–Early Indosinian, and the middle Himalayan, respectively; 4) the evolution of Shajingzi Fault system apparently dominated the formation of various Silurian structural–lithologic traps in the monoclinic structure background and efficiently connected the deep source rocks in the Awati Sag, especially during Himalayan period when the current tight sandstone gas reservoirs were formed. This research could find its benefit for exploration in similar basin–range junction areas.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%