Reservoir Characteristics of Member 4+5&nbsp;and 6 of Yangchang Formation from Upper Triassic in Hujianshan Area,Ordos Basin and Their Relationship with Oil Accumulation

GAO  Gang, HAN  Yong-Lin, FAN  Hong-Che, WANG  Yin-Hui, LIANG  Xin-Wei, XIN  Hong-Gang

doi:10.11764/j.issn.1672-1926.2011.04.576

2011 , Vol. 22 >Issue 4: 576 - 581

DOI: https://doi.org/10.11764/j.issn.1672-1926.2011.04.576

Reservoir Characteristics of Member 4+5 and 6 of Yangchang Formation from Upper Triassic in Hujianshan Area,Ordos Basin and Their Relationship with Oil Accumulation

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1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
2.Research Institute of Exploration and Development of Changqing Oilfield Company,Xi′an 710021,China;
3.Schlumberger Technologies(Beijing)Ltd.,Beijing 100015,China

Received date: 2011-01-06

Revised date: 2011-06-07

Online published: 2011-08-10

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Abstract

From the reservoir geological characteristics,rock composition and diagenesis,physical properties,pore types and so on,this paper analyzes the particularity of sandstone reservoirs in the member 6 to the member 4+5 of the upper Triassic Yanchang Formation from the Hujianshan area of Ordos basin,and discusses the reservoir characteristics and their relationship with oil accumulation.The sand body with strong heterogeneity develops in submarine distributary channel of delta front.The sandstones are mainly feldspathic lithic fine sandstone with strong diagenesis and low physical property values as a whole.Most of the reservoirs are low porosity and low permeability\|tight and the effective pore types are mainly intergranular pore,dissolution pore and intracrystalline pore.Oil accumulates in the reservoir layers with different physical properties and many aquifers have high porosity and permeability.So reservoir characteristics itself can not afford a decisive role in the petroleum gathering.There must have a good assemblage of higher physical property value reservoir,conduct pathway and oil surce can form oil pool.

Key words： Accumulation of oil; Sandstone reservoir; Low porosity and low permeability; Ordos basin.

Cite this article

GAO Gang, HAN Yong-Lin, FAN Hong-Che, WANG Yin-Hui, LIANG Xin-Wei, XIN Hong-Gang . Reservoir Characteristics of Member 4+5 and 6 of Yangchang Formation from Upper Triassic in Hujianshan Area,Ordos Basin and Their Relationship with Oil Accumulation[J]. Natural Gas Geoscience, 2011 , 22(4) : 576 -581 . DOI: 10.11764/j.issn.1672-1926.2011.04.576

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