Reservoir property of the special lithologic section in the lower Tengger Formation of A'nan depression, Er'lian basin

SUN Zhenmeng; QIAN Zheng; LU Xiancai; GUO Qin; XU Jintan; SHI Yuanpeng; HU Wenxuan

2017 Vol. 36, No. 4

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SUN Zhenmeng, QIAN Zheng, LU Xiancai, GUO Qin, XU Jintan, SHI Yuanpeng, HU Wenxuan. Reservoir property of the special lithologic section in the lower Tengger Formation of A'nan depression, Er'lian basin[J]. Geological Bulletin of China, 2017, 36(4): 644-653.

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SUN Zhenmeng, QIAN Zheng, LU Xiancai, GUO Qin, XU Jintan, SHI Yuanpeng, HU Wenxuan. Reservoir property of the special lithologic section in the lower Tengger Formation of A'nan depression, Er'lian basin[J]. Geological Bulletin of China, 2017, 36(4): 644-653.

Reservoir property of the special lithologic section in the lower Tengger Formation of A'nan depression, Er'lian basin

1.
School of Earth Sciences and Engineering, Nanjing 210023, Jiangsu China
2.
PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
3.
Beijing UltraDo Resources Technology Inc., Beijing 100083, China

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Corresponding author: LU Xiancai, xcljun@nju.edu.cn

Received Date: 18 October 2016

Revised Date: 14 February 2017

Publish Date: 25 April 2017

Abstract

Abstract

Although A'nan depression has been well prospected in past years, no lithologic reservoir has been discovered. The special lithologic section of the Tengger Formation is the potential reservoir strata. Based on lithologic characterization, scanning electronic microscopy, and electron probe measurement, the authors investigated the reservoir properties of the special lithologic section. The lithologic section is mainly composed of gray dolomitic mudstone, argillaceous dolomite, calcareous sedimentary stuff and calcareous fine sandstone intercalated with gray green massive tuff. The calcareous cementation and clayey cementation are the main types of ce-mentation. The tuff and sedimentary tuff elemental geochemical analysis shows that, with the alteration of diagenesis fluid, the silicate and sedimentary tuff dissolved significantly, which led to abundant secondary pores and strong depletion of heavy rare earth elements. These secondary pores and intergranular pores together with micro-fracture constitute the main potential reservoir space and the migration paths of the hydrocarbon.
- sedimentary tuff /
- diagenesis /
- reservoir property /
- special lithologic section /
- A'nan depression /
- Er'lian basin

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References

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