Natural Gas Geoscience ›› 2022, Vol. 33 ›› Issue (1): 125-137.doi: 10.11764/j.issn.1672-1926.2021.07.019

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New genesis model of the shale oil sweet-spot reservoir: Case study of Lucaogou Formation in Jimsar Sag, Junggar Basin

Yanxu HU1(),Chunyuan HAN1,Jilun KANG2,Bin LI1,Jianping WU1,Tao JIANG1,Jie FAN1,Dashuai YE1   

  1. 1.Research Institute of Petroleum Exploration and Development,PetroChina Huabei Oilfield Company,Renqiu 062552,China
    2.Exploration and Development Department of Eastern Junggar Basin,PetroChina Tuha Oilfield Company,Hami 839009,China
  • Received:2021-06-18 Revised:2021-07-28 Online:2022-01-10 Published:2022-01-26
  • Supported by:
    The China National Science and Technology Major Project(2016ZX05046-006-007)

Abstract:

Sweet-spot reservoir is the key and core of shale oil exploration and development. Aiming at the main controlling factors and formation mechanism, shale oil sweet-spot reservoir of Lucaogou Formation is investigated by using core observation, casting thin sections identification, scanning electron microscopy (SEM) analysis, physical test multiple methods and logging data. The results show that micro-pore is the necessary conditions for shale oil sweet-spot reservoirs. According to the occurrence and combination of the micro-pore, the sweet-spot reservoirs can be divided into three types: Isolated dissolved pore type, continuous dissolved pore type and continuous mixed pore type. The physical properties of different types are obviously different. The micro-pores are mainly secondary dissolution pore. The formation mechanism of dissolution micro-pore is the dissolution of organic acid in source, which is different from the dissolution of conventional oil and gas reservoirs outside the source. The dissolution in shale oil sweet-spot reservoirs is episodic overpressure charging and dissolution. The partial pressure of CO2 and the occurrence of clastic particles play an important role in controlling the in-source dissolution, the former of which controls the dissolution of minerals, while the latter controls the type of sweet-spot reservoirs. The proposal of in-source dissolution provides a new genesis model for shale oil sweet-spot reservoir.

Key words: Jimsar Sag, Lucaogou Formation, Shale oil, Sweet-spot reservoir, In-source dissolution

CLC Number: 

  • TE132.1

Fig.1

Geological setting(a) and stratigraphic features(b) of the Lucaogou Formation,Jimsar Sag[6]"

Fig.2

Pore characteristics of shale oil reservoir of Lucaogou Formation,Jimsar Sag"

Fig.3

The correlation between plane porosity and movable fluid,movable oil of shale oil sweet-pot reservoir of Lucaogou Formation"

Fig.4

The correlation between plane porosity and movable of reservoir in reservoir-forming units of shale oil of Lucaogou Formation"

Fig.5

The oil occurrence in shale oil sweet-pot reservoir of Lucaogou Formation in Jimsar Sag"

Fig.6

The types of shale oil sweet-pot reservoir of Lucaogou Formation in Jimsar Sag"

Fig.7

The scatter diagram between porosity and permeability of Lucaogou Formation in Jimsar Sag"

Fig.8

The scatter diagram between porosity and permeability of different reservoir of Lucaogou Formation in Jimsar Sag"

Fig.9

Pore characteristics of clastic reservoir of Wutonggou Formation in Jimsar Sag"

Fig.10

The model of in-source dissolution of shale oil sweet-pot reservoir"

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