巴西桑托斯盆地CO<sub>2</sub>区域分布及主控因素

赵健; 赵俊峰; 任康绪; 王童奎; 许必锋

doi:10.3799/dqkx.2020.359

Volume 46 Issue 9

Oct. 2021

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Article Navigation > Earth Science > 2021 > 46(9): 3217-3229

Zhao Jian, Zhao Junfeng, Ren Kangxu, Wang Tongkui, Xu Bifeng, 2021. Distribution and Main Controlling Factors of CO2 in Santos Basin, Brazil. Earth Science, 46(9): 3217-3229. doi: 10.3799/dqkx.2020.359

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Zhao Jian, Zhao Junfeng, Ren Kangxu, Wang Tongkui, Xu Bifeng, 2021. Distribution and Main Controlling Factors of CO₂ in Santos Basin, Brazil. Earth Science, 46(9): 3217-3229. doi: 10.3799/dqkx.2020.359

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Distribution and Main Controlling Factors of CO₂ in Santos Basin, Brazil

doi: 10.3799/dqkx.2020.359

Zhao Jian^{1, 2
,
,},
Zhao Junfeng¹,
Ren Kangxu^{1, 2},
Wang Tongkui¹,
Xu Bifeng¹

1.
China National Oil and Gas Exploration & Development Corporation, Beijing 100034, China
2.
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received Date: 2020-07-26
Available Online: 2021-10-14
Publish Date: 2021-10-14

Abstract

Abstract

An extraordinarily high amount of CO₂found in pre-salt section in Santos basin poses great challenges to the oil and gas exploration and development. In this study, combining regional gravity and magnetic database, deep-seismic lines, well drilling, formation test and samples dataset of the basin, the origin of CO₂ was clarified firstly, and its regional distribution patterns were statistically analyzed and their main controlling factors were explored as well. The widely distributed CO₂ in pre-salt reservoirs in Santos basin is mainly sourced from mantle, and mantle-derived CO₂ contributes at least 92% of the total volume of CO₂. Regionally, CO₂ abundance gradually increases from continent to ocean, and is relatively concentrated in the eastern uplift of the basin. On its margin usually occurs the current maximum CO₂ content values. The extra-high CO₂ abundance in Santos basin is the result of the combined action of various geological factors such as crust & mantle transition, regional tectonic evolution, magma events and fault activity. Among them, continental crust thinning and mantle uplifting are the most important background factors, controlling the regional distribution of CO₂. The intensive extension of crust caused a strong stretching and thinning of the lower continental crust of Sao Paulo platform, forming a crustal thinning area, around 5.1×10⁴ km², which caused the CO₂-rich mantle material to intrude upward into the continental crust. This uplifted mantle has directly controlled the regional distribution of CO₂ in Santos basin. Outside this area, the risk of CO₂ is significantly reduced. Magma injection or active faults are both important pathways for CO₂ migration and accumulation, with most common cases involving active faults leading CO₂ from "uplifted" mantle to shallower reservoirs. The NW-SE strike-slip faults and the NE-SW class I-II normal faults have an obvious control effect on distribution of CO₂ in shallower formation: NW-SE strike-slip fault could extend into deep mantle, while the NE-SW normal faults distribute these CO₂ in shallower layers. So that their intersection points or periphery areas are the most favorable areas for accumulation of magma and CO₂.
- Santos basin,
- origin of CO₂,
- regional distribution,
- main controlling factors,
- deep crustal structure,
- mantle-sourced magma,
- fault system,
- petroleum geology

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References(41)

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