Review of the High Natural Gamma Sandstones Associated With Source Rocks in the Chang 73 Submember of the Yanchang Formation, Ordos Basin

doi:10.19657/j.geoscience.1000-8527.2021.185

Abstract

Abstract:

For the high natural gamma sandstones associated with source rocks in the large-scale Chang 7₃ submember of the Triassic Yanchang Formation in the Ordos Basin, they had long been identified as high-quality source rocks (e.g. oil shales) from conventional well log profiles (e.g.natural gamma ray well logs). Based on core observation, and integrated analyses of well logging, logging, the electron microprobe and numerous actual production data of shale oil, a preliminary research about the definition was proposed. The genesis of these high natural gamma sandstones associated with source rocks in the Chang 7₃ submember was discussed, along with the correlation between its development and testing effect of shale oil of the Chang 7 Member. We suggest that they are narrow and broad types can be divided in the Chang 7₃ submember in the Ordos Basin, and that their highly radioactive genesis maybe related to deep hydrothermal sedimentation. It is newly found that there is a close correlation between their development and testing effect of shale oil of the Chang 7 member. This study has important theoretical and practical significance for the large-scale and efficient exploration and development of shale oil in the Chang 7 Member in the Ordos Basin.

Key words: high natural gamma sandstones associated with source rocks, shale oil, source rock, Chang 7₃ submember, Ordos Basin

CLC Number:

TE122.2

ZHENG Qinghua, LIU Xingjun, ZHANG Xiaolong, WANG Hongjun, LIAO Yongle, AN Erliang, LIU Tao, ZHANG Jianna, ZUO Qin. Review of the High Natural Gamma Sandstones Associated With Source Rocks in the Chang 7₃ Submember of the Yanchang Formation, Ordos Basin[J]. Geoscience, 2022, 36(04): 1087-1094.

Figures/Tables 7

Fig.1 Tectonic units of Ordos Basin and the location of Longdong area (modified from ref. [1])

Fig.2 Distribution of oil shale of the Yanchang Formation (Chang 7 member) at Longdong, which was interpreted by conventional logging series such as natural gamma logging (modified from ref. [9])

Fig.3 Integrated map of the Chang 73 sandstone member of Yanchang Formation at Longdong (modified from refs.[2-3,14])

Fig.4 Integrated stratigraphic column of the Chang 73 sandstone member in Well Ban 36 (modified from refs.[2-3])

Fig.5 Integrated stratigraphic column of the Chang 73 sandstone member in Well Ning 138 (modified from ref.[2-3])

Fig.6 Characteristics of radioactive minerals of high gamma sandstone from the Chang 73 member of the Yanchang Formation, Ordos Basin (BSE image)

Fig.7 Shale oil production test columns of the Chang 73 sandstone member of the Yanchang Formation, Ordos Basin

References 19

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Review of the High Natural Gamma Sandstones Associated With Source Rocks in the Chang 7₃ Submember of the Yanchang Formation, Ordos Basin

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