Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin

YOU Fuliang; LIU Guangdi; SUN Mingliang; LI Chaozheng; LIU Xiangbai; AN Cheng; WANG Zixin; LI Yishu

doi:10.11781/sysydz202301099

Volume 45 Issue 1

Jan. 2023

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YOU Fuliang, LIU Guangdi, SUN Mingliang, LI Chaozheng, LIU Xiangbai, AN Cheng, WANG Zixin, LI Yishu. Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(1): 99-108. doi: 10.11781/sysydz202301099

Citation:

YOU Fuliang, LIU Guangdi, SUN Mingliang, LI Chaozheng, LIU Xiangbai, AN Cheng, WANG Zixin, LI Yishu. Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(1): 99-108. doi: 10.11781/sysydz202301099

Citation:

YOU Fuliang, LIU Guangdi, SUN Mingliang, LI Chaozheng, LIU Xiangbai, AN Cheng, WANG Zixin, LI Yishu. Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(1): 99-108. doi: 10.11781/sysydz202301099

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Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin

doi: 10.11781/sysydz202301099

YOU Fuliang^{1, 2
,},
LIU Guangdi^{1, 2
,
,},
SUN Mingliang^{1, 2},
LI Chaozheng³,
LIU Xiangbai^{1, 2},
AN Cheng^{1, 2},
WANG Zixin^{1, 2},
LI Yishu^{1, 2}

1.
College of Geosciences, China University of Petroleum Beijing (Beijing), Beijing 102249, China
2.
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
3.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Received Date: 2022-02-15
Rev Recd Date: 2022-11-29
Publish Date: 2023-01-28

Abstract

Abstract

A large number of sandstone interlayers were developed in the shale strata of the 7th member of the Triassic Yanchang Formation (Chang 7 member) in the Ordos Basin. These sandstone interlayers are frequently accompanied by abnormally high natural gamma values as high as 330.5 API. As a result, they are undistingui shable from shale on well profile. To characterize the high-gamma sandstones, the clastic rocks of the Chang 7 member were classified into fine sandstone, siltstone, argillaceous siltstone, silty mudstone, mudstone and shale according to grain size and structural characteristics. Conventional logging data were recalculated and combined into two new parameters—A and B. The new intersection chart composed of parameters A and B and natural gamma logging data can effectively distinguish and identify normal sandstone and high-gamma sandstone in the Chang 7 member. The plane distribution of cumulative thickness of high-gamma sandstone in the Chang 7 member shows that the high-gamma sandstone is mainly located in the southwest of the study area. The finger-like distribution of high-gamma sandstone from the edge to the center of the lake basin indicates that its formation may be related to the volcanic eruption during sedimentary period.
- high-gamma sandstone,
- lithologic identification,
- Chang 7 member,
- Yanchang Formation,
- Triassic,
- Ordos Basin

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References(26)

References

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Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin

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Logging identification and distribution characteristics of high-gamma sandstones in the 7th member of Triassic Yanchang Formation, Ordos Basin

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