准噶尔盆地阜康凹陷侏罗系超压成因、垂向传导及油气成藏

宫亚军; 张奎华; 曾治平; 秦峰; 牛靖靖; 范婕; 刘慧

doi:10.3799/dqkx.2020.366

Volume 46 Issue 10

Nov. 2021

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Article Navigation > Earth Science > 2021 > 46(10): 3588-3600

Gong Yajun, Zhang Kuihua, Zeng Zhiping, Qin Feng, Niu Jingjing, Fan Jie, Liu Hui, 2021. Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin. Earth Science, 46(10): 3588-3600. doi: 10.3799/dqkx.2020.366

Citation:

Gong Yajun, Zhang Kuihua, Zeng Zhiping, Qin Feng, Niu Jingjing, Fan Jie, Liu Hui, 2021. Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin. Earth Science, 46(10): 3588-3600. doi: 10.3799/dqkx.2020.366

Citation:

Gong Yajun, Zhang Kuihua, Zeng Zhiping, Qin Feng, Niu Jingjing, Fan Jie, Liu Hui, 2021. Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin. Earth Science, 46(10): 3588-3600. doi: 10.3799/dqkx.2020.366

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Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin

doi: 10.3799/dqkx.2020.366

Research Institute of Exploration and Development, Shengli Oilfield, SINOPEC, Dongying 257200, China

Received Date: 2020-08-01
Available Online: 2021-11-03
Publish Date: 2021-11-03

Abstract

Abstract

Overpressure in sedimentary basins is widely concerned, but the lack of understanding of mechanism of the overpressure transfer restricts the exploration of oil and gas in the over-pressured reservoir of sedimentary basins. Taking Jurassic overpressure of Fukang sag in Junggar basin as an example, the important contribution of vertical transfer overpressure to reservoirs was recognized for the first time through the comprehensive geological studies of overpressure type, the theoretical calculation of characterization parameters of overpressure and the fluid inclusion pressure recovery. Combined with the overpressure vertical transfer mechanism and process, the application for oil migration and accumulation and leakage in the over-pressured reservoir is discussed. The research results indicate that the Jurassic overpressure in Fukang sag is caused by seven kinds of pressure factors in four different overpressure environments. Furthermore, basin modelling and fluid inclusions pressure recovery results show that two stages of overpressure vertical transfer in Jurassic can be conformed to well explain the superposition phenomenon of multiple cause types of over-pressured reservoirs. Theoretical analysis indicates that pressure vertical transfer are controlled by three kinds of factors, such as the geomechanical properties of the seals or sealing faults, the differential stress and the fluid pressure. Under the control of the factors above, three types reservoirs related to the overpressure vertical transfer are formed: over-pressured reservoirs related to fault vertical transfer; hydrostatic pressure reservoirs related to oil and water differentiation on overpressure interface and over-pressured reservoirs related to sandstone lateral transfer. The migration, accumulation and leakage characteristics of the above three types of reservoirs are quite different in their potential beneficial target areas.
- origin of overpressure,
- vertical transfer,
- fault,
- hydrocarbon migration and accumulation,
- Fukang sag,
- Junggar basin,
- hydrocarbon

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References(48)

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Origin of Overpressure, Vertical Transfer and Hydrocarbon Accumulation of Jurassic in Fukang Sag, Junggar Basin

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