南盘江坳陷东兰地区下石炭统鹿寨组页岩气成藏条件及有利区预测

王劲铸; 李小刚; 徐正建; 辛云路; 李昭; 李仪汶

doi:10.3799/dqkx.2020.310

Volume 46 Issue 5

May 2021

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Article Navigation > Earth Science > 2021 > 46(5): 1814-1828

Wang Jinzhu, Li Xiaogang, Xu Zhengjian, Xin Yunlu, Li Zhao, Li Yiwen, 2021. Shale Gas Accumulation Conditions and Favorable-Zone Prediction in Lower Carboniferous Luzhai Formation in Donglan Area of Nanpanjiang Depression, China. Earth Science, 46(5): 1814-1828. doi: 10.3799/dqkx.2020.310

Citation:

Wang Jinzhu, Li Xiaogang, Xu Zhengjian, Xin Yunlu, Li Zhao, Li Yiwen, 2021. Shale Gas Accumulation Conditions and Favorable-Zone Prediction in Lower Carboniferous Luzhai Formation in Donglan Area of Nanpanjiang Depression, China. Earth Science, 46(5): 1814-1828. doi: 10.3799/dqkx.2020.310

Citation:

Wang Jinzhu, Li Xiaogang, Xu Zhengjian, Xin Yunlu, Li Zhao, Li Yiwen, 2021. Shale Gas Accumulation Conditions and Favorable-Zone Prediction in Lower Carboniferous Luzhai Formation in Donglan Area of Nanpanjiang Depression, China. Earth Science, 46(5): 1814-1828. doi: 10.3799/dqkx.2020.310

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Shale Gas Accumulation Conditions and Favorable-Zone Prediction in Lower Carboniferous Luzhai Formation in Donglan Area of Nanpanjiang Depression, China

doi: 10.3799/dqkx.2020.310

Wang Jinzhu^{1
,
,},
Li Xiaogang^{2, 3},
Xu Zhengjian^{2
,
,
,},
Xin Yunlu¹,
Li Zhao¹,
Li Yiwen²

1.
Oil & Gas Survey Center, China Geological Survey, Beijing 100083, China
2.
Chongqing Key Laboratory of Complex Oil & Gas Exploration and Development, Chongqing University of Science & Technology, Chongqing 401331, China
3.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2020-09-06
Publish Date: 2021-05-15

Abstract

Abstract

Nanpanjiang depression, proved to be one of the strategic exploration zones of marine shale gas in periphery of Sichuan basin, possesses a huge shale gas potential. However, the shale gas exploration in Nanpanjiang depression has been restricted seriously, mainly for the late start of shale gas exploration and non-clear target selection. Based on the field investigation and previous studies in northeastern Nanpanjiang depression, the Lower Carboniferous Luzhai shale distribution was ascertained. According to the organic geochemistry, X-ray diffraction, and scanning electron microscopy (SEM), the source rock geochemical characteristics, shale reservoir characteristics, and shale gas preservation conditions were analyzed. The study shows that the thickness of Luzhai shale in northeastern Nanpanjiang depression is mainly 250-350 m, and the burial depth of the shale is mainly 1 000-3 000 m. The TOC values of the Luzhai shale are mainly >2.0%, and the kerogen types are mainly Type Ⅱ₁-Ⅱ₂. The organic matters in shale mainly reach the high-to over-mature stage, suggesting that the shale should possess an excellent source rock potential. The contents of brittle minerals in the Luzhai shale are relatively high, and the pore spaces in the shale and the adsorption capacities of shale are well developed, indicating a well-developed shale gas reservoir. The high content of clay minerals and relatively strong compaction and cementation in the shale strengthened the relatively strong self-seal capacity of shale, indicating good preservation conditions for shale gas. Multi-episodes tectonic movements played an important role on the shale gas preservation. Compared with accumulation conditions of the typical shale gas in domestic and foreign basins, the Luzhai shales in the northeastern Nanpanjiang depression possess favorable accumulation conditions for shale gas, suggesting the northeastern part of Donglan area in the Nanpanjiang depression should be a favorable shale gas exploration zone in South China.
- shale gas,
- Luzhai Formation,
- accumulation condition,
- favorable zone,
- Nanpanjiang depression,
- petroleum geology

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References(74)

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Shale Gas Accumulation Conditions and Favorable-Zone Prediction in Lower Carboniferous Luzhai Formation in Donglan Area of Nanpanjiang Depression, China

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