| Citation: |
Jun-feng Zhang, Gang-yi Zhai, Da-ming Wang, Shu-jing Bao, Ke Chen, Hao-han Li, Teng Song, Peng Wang, Zhi Zhou, 2020. Tectonic evolution of the Huangling dome and its control effect on shale gas preservation in the north margin of the Yangtze Block, South China, China Geology, 3, 28-37. doi: 10.31035/cg2020025
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Tectonic evolution of the Huangling dome and its control effect on shale gas preservation in the north margin of the Yangtze Block, South China
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Abstract
Significant breakthroughs of shale gas exploration have been made in Lower Cambrian and Sinian shale in the north margin of the Yangtze Block, South China. The drill wells with industrial gas flow located in the southern margin of the Huangling dome. Base on the geological survey, 2D seismic, geochronological and drill wells data, the tectonic evolution history of Huangling dome was studied, and its control effect on the preservation condition of shale gas was discussed. The result shows that the Huangling dome might undergo four tectonic stages: (1) About 800 Ma, granite intrusion in the Huangling dome basement, primarily of granites replaced metamorphism rocks; (2) 800–200 Ma, no significant tectonic movement with slowly buried history; (3) From 200 Ma, multi-phase uplift and the sedimentary rocks was eroded in the core of the Huangling dome. Shale gas in the Cambrian and Sinian strata was well preserved in the margin of the Huangling dome as the following reasons: (1) The Sinian shale was buried about 7.8 km in-depth during Middle Jurassic, source rocks have a suitable thermal maturity for shale gas; (2) The rigid basement of the Huangling dome was mainly composed by homogeneity granite, without intensive deformation. As the main challenges of the widely distributed Lower Cambrian and Sinian shale are high-maturity and intensive deformation, a geological unit with a dome probably is a favorable zone for the old age shale gas. Therefore, it indicates that the adjacent zone of the Xuefengshan, Shennongjia and Hannan are the geological units with a dome and probably have potentials for the exploration of shale in the Lower Cambrian and Sinian.
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References
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Jun-feng Zhang, Gang-yi Zhai, Da-ming Wang, Shu-jing Bao, Ke Chen, Hao-han Li, Teng Song, Peng Wang, Zhi Zhou, 2020. Tectonic evolution of the Huangling dome and its control effect on shale gas preservation in the north margin of the Yangtze Block, South China, China Geology, 3, 28-37. doi: 10.31035/cg2020025
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Figure 1.
The geological map of Huangling dome. a–tectonic position of the Huangling dome (modified from Ji W et al., 2014); b–geological map of Huangling dome southern wing (after Hubei Geological Investigation Agency, 2011); c–geological section of Huangling dome southern limb (based on 2D seismic sections).
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Figure 2.
East-West comparison of drilled wells EYY1, ZD1 and ZD2 (refer to Fig. 1b for the position).
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Figure 3.
Sedimentary burial history analysis of Well ZD1 and Well ZD2.
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Figure 4.
Geological section of southern margin of Huangling dome across Tianyangping fault according to 2D seismic data (refer to Fig. 1b for the position).
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Figure 5.
Chronological data statistical graph of Huangling dome and its surrounding area. a–zircon U-Pb dating data; b–the helium of the apatite dating data; c–apatite fission-track dating data; d–the helium of zircon dating data.
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Figure 6.
The tectonic evolution history of Huangling dome basement (Refer to Fig. 3 for sedimentary burial history data; refer to Fig. 5 for geochronological data). U-Pb–zircon uranium-lead age; ZHe–zircon helium age; AFT–apatite fission-track age; AHe–apatite helium age.
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Figure 7.
Schematic illustration showing Huangling dome uplifting. (a–continuous deposition in Huangling dome and its adjacent area during Triassic; b–Huangling dome started to lift during Late Jurassic; c–Tianyangping Fault and Xiannüshan Fault began to take shape during Late Cretaceous; d–the current tectonic geometry takes shape.