Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (6): 1654-1664.doi: 10.13278/j.cnki.jjuese.20200207

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Main Types, Characteristics and Genetic Model of Oil & Gas Reservoirs with High CO2 Content in Santos Basin, Brazil

Zhao Jian1,2, Zhao Junfeng1, Ren Kangxu1,2, Wang Tongkui1, Xu Bifeng1, Hao Qiangsheng1, Gao Zhiyuan1   

  1. 1. China National Oil and Gas Exploration & Development Corporation, Beijing 100034, China;
    2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2020-09-16 Online:2021-11-26 Published:2021-11-24
  • Supported by:
    Supported by the National Science and Technology Major Project (2016ZX05029005)

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Abstract: Together with the encouraging oil and gas discoveries in the pre-salt section in Santos basin, the reservoirs are also characterized by a wide occurrence of CO2 and high gas-oil ratio (GOR), which leads to a series of challenges both in oil & gas exploration and development. Based on the CO2 content and fluid phases, the reservoirs currently discovered in Santos basin could be divided into three types:Type Ⅰ conventional oil reservoirs containing dissolved CO2 with high GOR, type Ⅱ CO2 gas cap + oil ring reservoirs and type Ⅲ CO2 gas reservoirs (containing dissolved hydrocarbons). For type Ⅰ oil reservoir and type Ⅲ CO2 gas reservoir, the fluid properties, such as GOR, API and CH4 content are uniform, and oil-water contact and gas-water contact are easily defined. For type Ⅱ gas cap+oil ring reservoirs, its fluid properties are not uniform anymore and are very complex. The authors proposed an innovative geological model, dynamic dissolving-extracting between CO2 and hydrocarbon. The three types of reservoirs are likely to be a mixture of two different endmembers, supercritical CO2 and fluid hydrocarbon. The crude oil dissolves CO2 while CO2 extracts lighter components of hydrocarbon. There is a dynamic balance point or scale under certain pressure and temperature. If CO2 volume is less than the balance points, the crude oil could dissolve it completely and the reservoir belongs to type Ⅰ. If the CO2 volume is larger than that, a gas cap will appear, and the reservoir become type Ⅱ. In some situations, the CO2 volume is very large while hydrocarbon is very limited, the type Ⅲ CO2 gas reservoir will be developed. Therefore, the relative amount of hydrocarbon and CO2 determine the fluid phases and types of reservoirs finally. Meanwhile, the reservoir types could also change with temperature, pressure, or tectonic movement. Because these factors could break such balance and result in phase change and transition.

Key words: Santos basin, oil & gas reservoirs with high CO2 content, fluid properties, supercritical CO2, genetic model, dynamic balance of dissolving-extracting

CLC Number: 

  • P618.13
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