Citation: | Shu-jing Bao, Gang-yi Zhai, Zhi Zhou, Shu-fang Yu, Ke Chen, Yu-fang Wang, Hao Wang, Yi-min Liu, 2018. The evolution of the Huangling uplift and its control on the accumulation and preservation of shale gas, China Geology, 1, 346-353. doi: 10.31035/cg2018052 |
There are plenty of Sinian and Cambrian potential shale gas resources in South China, which is characterized by high thermal evolution degrees, poor drilling performances and only occurs in local areas. Taking the principle “high to find low” is the key issue to achieving a breakthrough in older shale. China Geological Survey drilled in the periphery of the Proterozoic basement, i.e. the Huangling anticline, in the western Hubei, and Hannan paleocontinent in the southern Shanxi. It received high-quality gas-bearing shale with relatively low Ro in the in Lower Cambrian Niutitang formation and Sinian Doushantuo formation. Based on geological conditions of shale gas reservoirs in the Huangling anticline, this paper puts forward the new model named “Control over reservoirs by periphery of basement” about shale gas accumulation, suggesting that the shale deposited in a deepwater continental shelf in the periphery of the basement is characterized by shallow burial, a short burial time, stable tectonics, relatively low thermal evolution degrees, and shale gas reservoirs in a good condition. The shale of the Sinian-Cambrian strata deposited in deepwater continental shelves in the periphery of Chuanzhong paleo-uplift in Sichuan, Hannan paleocontinent in the southern Shanxi, Huangling anticline in western Hubei and Jiangnang-Xuefeng paleo-uplift in Hunan and Guizhou province have good shale gas exploration potential.
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Geological map of Huangling uplift and its peripheral area.
Cross-well profile of the Cambrian in the peripheral areas of the Huangling uplift.
The buried history of Sinian and Cambrian in E’Yangye No.1 well.
The micropore and microfracture characteristics of Lower Cambrian Niutitang Formation in Zidi No.1 well.
Distribution map of thermal evolution degrees (Ro) of shale in the Lower Cambrian Niutitang Formation in the Huangling uplift and its surrounding areas.
2D seismic profile of the E’Yangye No.1 well in the area of the Huangling uplift. A−B is the section position.