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Buoyance-driven hydrocarbon accumulation depth and its implication for unconventional resource prediction

文献类型：期刊论文

作者Pang, Xiongqi1,6; Jia, Chengzao2,6; Wang, Wenyang3,6; Chen, Zhangxin4; Li, Maowen5; Jiang, Fujie1,6; Hu, Tao1,6; Wang, Ke1; Wang, Yingxun1
刊名GEOSCIENCE FRONTIERS
出版日期2021-07-01
卷号12期号:4页码:17
ISSN号1674-9871
关键词Nature energy Fossil energy Oil and gas resources Conventional hydrocarbon reservoirs Unconventional hydrocarbon reservoirs Buoyance-driven hydrocarbon accumulation depth
DOI10.1016/j.gsf.2020.11.019
英文摘要The discovery of unconventional hydrocarbon resources since the late 20th century changed geologists' understanding of hydrocarbon migration and accumulations and provides a solution to energy shortage. In 2016, unconventional oil production in the USA accounted for 41% of the total oil production; and unconventional natural gas production in China accounted for 35% of total gas production, showing strong growth momentum of unconventional hydrocarbons explorations. Unconventional hydrocarbons generally coexist with conventional petroleum resources; they sometimes distribute in a separate system, not coexisting with a conventional system. Identification and prediction of unconventional resources and their potentials are prominent challenges for geologists. This study analyzed the results of 12,237 drilling wells in six representative petroliferous basins in China and studied the correlations and differences between conventional and unconventional hydrocarbons by comparing their geological features. Migration and accumulation of conventional hydrocarbon are caused dominantly by buoyance. We propose a concept of buoyance-driven hydrocarbon accumulation depth to describe the deepest hydrocarbon accumulation depth driven dominantly by buoyance; beyond this depth the buoyance becomes unimportant for hydrocarbon accumulation. We found that the buoyance-driven hydrocarbon accumulation depth in petroliferous basins controls the different oil/gas reservoirs distribution and resource potentials. Hydrocarbon migration and accumulations above this depth is dominated by buoyancy, forming conventional reservoirs in traps with high porosity and permeability, while hydrocarbon migration and accumulation below this depth is dominated by non-buoyancy forces (mainly refers to capillary force, hydrocarbon volume expansion force, etc.), forming unconventional reservoirs in tight layers. The buoyance-driven hydrocarbon accumulation depths in six basins in China range from 1200 m to 4200 m, which become shallower with increasing geothermal gradient, decreasing particle size of sandstone reservoir layers, or an uplift in the whole petroliferous basin. The predicted unconventional resource potential below the buoyance-driven hydrocarbon accumulation depth in six basins in China is more than 15.71 x 10(9) t oil equivalent, among them 4.71 x 10(9) t reserves have been proved. Worldwide, 94% of 52,926 oil and gas reservoirs in 1186 basins are conventional reservoirs and only 6% of them are unconventional reservoirs. These 94% conventional reservoirs show promising exploration prospects in the deep area below buoyance-driven hydrocarbon accumulation depth. (C) 2021 China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V.
WOS关键词BOHAI BAY BASIN ; SICHUAN BASIN ; SANDSTONE RESERVOIRS ; PETROLEUM GEOLOGY ; JUNGGAR BASIN ; ORDOS BASIN ; SHALE GAS ; OIL ; MODEL ; INDEPENDENCE
资助项目National Natural Science Foundation of China[U19B6003-02] ; National Basic Research Program (973) of China[2011CB201100]
WOS研究方向Geology
语种英语
出版者CHINA UNIV GEOSCIENCES, BEIJING
WOS记录号WOS:000654356800006
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973) of China ; National Basic Research Program (973) of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973) of China ; National Basic Research Program (973) of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973) of China ; National Basic Research Program (973) of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program (973) of China ; National Basic Research Program (973) of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/102031]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Pang, Xiongqi
作者单位1.China Univ Petr, Coll Geosci, Beijing 102249, Peoples R China
2.China Natl Petr Corp, Explorat & Dev Res Inst, Beijing 100724, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Univ Calgary, Schulich Sch Engn, Chem & Petr Engn, Calgary, AB T2N 1N4, Canada
5.State Key Lab Shale Oil & Gas Enrichment Mech & E, Beijing 100083, Peoples R China
6.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
推荐引用方式
GB/T 7714		 Pang, Xiongqi,Jia, Chengzao,Wang, Wenyang,et al. Buoyance-driven hydrocarbon accumulation depth and its implication for unconventional resource prediction[J]. GEOSCIENCE FRONTIERS,2021,12(4):17.
APA Pang, Xiongqi.,Jia, Chengzao.,Wang, Wenyang.,Chen, Zhangxin.,Li, Maowen.,...&Wang, Yingxun.(2021).Buoyance-driven hydrocarbon accumulation depth and its implication for unconventional resource prediction.GEOSCIENCE FRONTIERS,12(4),17.
MLA Pang, Xiongqi,et al."Buoyance-driven hydrocarbon accumulation depth and its implication for unconventional resource prediction".GEOSCIENCE FRONTIERS 12.4(2021):17.

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来源：地质与地球物理研究所

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