Geological condition and sweet area selection of Fuyu Formation in the north of Songliao Basin

Li Guo-hui, Kang De-jiang, Jiang Li-na, Jiang Hang, Li Miao, Sun Hai-lei, Wu Ying

doi:10.11764/j.issn.1672-1926.2019.06.012

Natural Gas Geoscience >

2019 , Vol. 30 >Issue 8: 1106 - 1113

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.06.012

Geological condition and sweet area selection of Fuyu Formation in the north of Songliao Basin

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Exploration and Development Research Institute，PetroChina Daqing Oil Field Company Limited，Daqing 163712，China

Received date: 2019-04-15

Revised date: 2019-06-04

Online published: 2019-09-12

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Abstract

The tight oil of Fuyu reservoir in northern Songliao Basin is a typical under-source tight reservoir，which has favorable geological conditions for forming large-scale and continuous tight reservoirs.Based on the analysis and statistics of a large number of experimental data and drilling data，the reservoir forming conditions of tight oil source rocks，sedimentary environment and reservoir characteristics of Fuyu reservoir in northern Songliao Basin are comprehensively analyzed.The study shows that the formation of tight oil in Fuyu reservoir is controlled by mature source rocks and delta front facies belt.The meandering river point bar sand body and distributary channel sand body have thin single layer thickness，fast lateral variation and vertical staggered links.Reservoirs are mainly micron-nano pore.The boundary between conventional reservoir and compact reservoir is 12% porosity，1×10-³μm² permeability and 350nm pore throat radius.The internal boundaries of compact reservoir are 8% porosity，0.1×10-³μm² permeability and 75nm pore throat radius.The main driving force of tight oil reservoir formation is hydrocarbon generation and pressurization of effective source rocks in the first member of Qinghai Formation，which belongs to the mechanism of inverted reservoir formation.Faults are the main migration pathway，and high-quality dessert areas are mainly distributed in the central part of Daqing Placanticline，Sanzhao Depression and west side of Qijia Gulong Depression.

Key words： Northern Songliao Basin; Fuyu reservoir; Micron-nanopore; Overpressure; Tight oil sweet area

Cite this article

Li Guo-hui, Kang De-jiang, Jiang Li-na, Jiang Hang, Li Miao, Sun Hai-lei, Wu Ying . Geological condition and sweet area selection of Fuyu Formation in the north of Songliao Basin[J]. Natural Gas Geoscience, 2019 , 30(8) : 1106 -1113 . DOI: 10.11764/j.issn.1672-1926.2019.06.012

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