辽河坳陷西部凹陷南段古近系沙河街组致密砂岩特征与成因机制<sup>*</sup>

doi:10.7605/gdlxb.2016.04.042

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Abstract Low-yield and commercial oil flows have been discovered in the Paleogene Shahejie Formation,southern West Sag,Liaohe Depression,Bohai Bay Basin. The reservoirs are typical tight sandstone reservoirs characterized by low-ultralow porosity,extra-low-ultralow permeability and low pressure. Based on data of thin sections,SEM,grain size,mercury pressure analysis and physical property,the micro-characteristics and formation mechanisms of tight sandstones were analysed. The results show that:The tight reservoirs(with porosity value lower than 10%)are mainly distributed in the sag area;The formation of tight reservoirs are not controlled by factors such as mineral composition,grain size,grain sorting and roundness;Pore types mainly consist of secondary pores and pore structures are characterized by medium pore diameter,tiny throat and heterogeneous throat sorting;The tight sandstones are mainly formed through compactions and cementations and are thus categorized as diagenetic tight sandstones.

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	Articles by authors
	Meng Yuanlin
	Wang Zhixuan
	Zhang Fenglian
	Meng Fanjin
	Jiao Jinhe
	Shi Lidong

Key words： tight sandstone unconventional oil and gas formation mechanism West Sag Liaohe Depression Paleogene

Received: 23 June 2015 Published: 01 August 2016

ZTFLH:

TE122.2+21

About author: Meng Yuanlin,born in 1961,is a professor and Ph.D. supervisor of Northeast Petroleum University. He is mainly engaged in the research and teaching of petroleum geology and unconventional petroleum geology.E-mail: qhdmyl@163.com.

Cite this article:

Meng Yuanlin,Wang Zhixuan,Zhang Fenglian et al. Characteristics and forming mechanism of tight sandstones in the Paleogene Shahejie Formation of southern West Sag,Liaohe Depression[J]. JOPC, 2016, 18(4): 569-580.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2016.04.042 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2016/V18/I4/569

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