Lithofacies and sedimentary environment evolution of the Shan23 Sub-member transitional shale of the Shanxi Formation in the Daning-Jixian area, eastern Ordos Basin

被引：0

作者：

Sun Y. ^{[1
,2
]}

Jiang Y. ^{[1
,2
]}

Xiong X. ^{[3
]}

Li X. ^{[3
]}

Li S. ^{[3
]}

Qiu Z. ^{[4
]}

Sun X. ^{[3
]}

机构：

[1] School of Geoscience and Technology, Southwest Petroleum University, Chengdu

[2] Unconventional Reservoir Evaluation Laboratory, PetroChina Key Laboratory of Unconventional Oil and Gas, Chengdu

[3] PetroChina Coalbed Methane Company Limited, Beijing

[4] PetroChina Research Institute of Petroleum Exploration & Development, Beijing

来源：

Meitiandizhi Yu Kantan/Coal Geology and Exploration | 2022年 / 50卷 / 09期

关键词：

eastern Ordos Basin; geochemical indicator; lithofacies; marine-continental transitional shale; Permian; sedimentary environment; Shanxi Formation;

D O I：

10.12363/issn.1001-1986.21.12.0821

中图分类号：

学科分类号：

摘要：

The Shan32 Sub-member transitional facies shale of the Permian Shanxi Formation in the eastern margin of the Ordos Basin is a crucial target for future unconventional oil and gas exploration. Based on field outcrop observation, core description and thin-section identification, combined with X-ray diffraction, trace elements test and other analyses, four types of shale lithofacies were identified, including siliceous, siliceous-argillaceous, calcareous-siliceous (or siliceous-calcareous) and argillaceous lithofacies. The petrological characteristics and geochemical indicators show that the depositional environment of the Shan32 Sub-member inherited the epicontinental sea pattern with relatively gentle topography of the late Taiyuan Epoch. The large-scale transgression led to the rapid evolution of the study area into a bay environment in the early depositional stage of the Shan32 Sub-member. Thus, the sedimentary environment changed from oxidation to reduction. The salinity of the water body was close to normal seawater, and the preservation conditions for the organic matter were favorable, forming organic-rich shale lithofacies in the lower part of the Shan32 Sub-member. The calcareous-siliceous (or siliceous-calcareous) lithofacies are relatively high-quality organic-rich shale lithofacies with high TOC, brittle minerals, and low clay content; and are favorable for shale gas development. In the late depositional stage of the Shan32, the study area gradually evolved into a barrier island depositional system. Siliceous-argillaceous and argillaceous lithofacies developed in lagoon and coastal swamp environments. Though affected by multi-stage marine transgressions, seawater’s influence gradually weakened, water salinity decreased, the sedimentary environment tended to be oxidized, and organic matter preservation conditions worsened. Copyright © 2022 Meitiandizhi Yu Kantan/Coal Geology and Exploration

引用

页码：104 / 114

页数：10

共 34 条

[1] ZOU Caineng, DONG Dazhong, WANG Yuman, Et al., Shale gas in China：Characteristics，challenges and prospects (Ⅱ)[J], Petroleum Exploration and Development, 43, 2, (2016)
[2] KUANG Lichun, DONG Dazhong, HE Wenyuan, Et al., Geological characteristics and development potential of transitional shale gas in the east margin of the Ordos Basin，NW China[J], Petroleum Exploration and Development, 47, 3, pp. 435-446, (2020)
[3] Yong LI, Dazhen TANG, Peng WU, Et al., Continuous unconventional natural gas accumulations of Carboniferous –Permian coal–bearing strata in the Linxing area，northeastern Ordos Basin，China[J], Journal of Natural Gas Science and Engineering, 36, (2016)
[4] Yong LI, WANG Zhuangsen, GAN Quan, Et al., Paleoenvironmental conditions and organic matter accumulation in Upper Paleozoic organic–rich rocks in the east margin of the Ordos Basin，China[J], Fuel, 252, (2019)
[5] CHEN Hongde, LI Jie, ZHANG Chenggong, Et al., Discussion of sedimentary environment and its geological enlightenment of Shanxi Formation in Ordos Basin[J], Acta Petrologica Sinica, 27, 8, pp. 2213-2229, (2011)
[6] Wei DU, JIANG Zaixing, ZHANG Ying, Et al., Sequence stratigraphy and sedimentary facies in the lower member of the Permian Shanxi Formation，northeastern Ordos Basin，China[J], Journal of Earth Science, 24, 1, (2013)
[7] GUO Wei, LIU Honglin, XUE Huaqing, Et al., Depositional facies of Permian Shanxi Formation gas shale in the northern Ordos Basin and its impact on shale reservoir[J], Acta Geologica Sinica, 89, 5, pp. 931-941, (2015)
[8] SUN Zepeng, WANG Yongli, WEI Zhifu, Et al., Shale gas content and geochemical characteristics of marine–continental transitional shale： A case from the Shanxi Formation of Ordos Basin[J], Journal of China University of Mining & Technology, 46, 4, pp. 859-868, (2017)
[9] LI Yalong, YU Xinghe, ZHOU Jinsong, Et al., The study on provenance and meandering river delta system of Shan 2 Member in southeastern Ordos Basin[J], Acta Sedimentologica Sinica, 35, 3, pp. 540-551, (2017)
[10] WANG Xiangzeng, ZHOU Jinsong, Provenance system and sedimentary evolution model of the second Member of Lower Permian Shanxi Formation in the southeastern Ordos Basin[J], Natural Gas Industry, 37, 11, (2017)

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