准噶尔盆地玛湖凹陷下二叠统风城组碱湖岩石特征与成因<sup>*</sup>

doi:10.7605/gdlxb.2018.01.010

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Abstract

The Lower Permian Fengcheng Formation,as favourable source rock in the Junggar Basin,has been the target for petroleum exploration. Due to its deep burial depth,complicated lithology and few global analogs,the evaluation of the petroleum potential of Fengcheng Formation is still at its rudimentary stage. This study discusses the characteristics of alkaline minerals,geological background,origin of alkaline lakes and its forming processes through methods including core description,thin section observation,SEM,X-ray diffraction analysis,TOC content measurements,inclusion temperature test,geochemical analysis,etc. the results suggest: (1)the Fengcheng Formation can be categorized into five rock types,among which,alkaline rock is the most distinguished lithofacies type of alkaline lakes and reedmergnerite is generally related to volcanic eruption or hydrothermal activities;(2)five rock associations are recognized in the Fengcheng Formation. From near-source to lake center,they are type Ⅴ of alluvial-fluvial facies,type Ⅲ and Ⅳ of shallow shoreface to lacustrine facies,respectively;type Ⅰ and Ⅱ of deep-semideep lacustrine facies,respectively. Type Ⅰ and Ⅲ are typical alkaline rock associations with favourable source rock potential;(3)the formation of alkaline lake is primarily controlled by volcanic activities and climate,where the former supply the Na-rich fluids,and the latter salinized the freshwater lake and facilitate the final formation of alkaline lake.

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	Articles by authors
	Wang Meng-Shi
	Zhang Zhi-Jie
	Zhou Chuan-Min
	Yuan Xuan-Jun
	Lin Min-Jie
	Liu Yin-He
	Cheng Da-Wei

Key words： Junggar Basin Lower Permian Fengcheng Formation alkaline lacustrine rock types lithology association genetic analysis

Received: 10 July 2017

ZTFLH:

P588.21

Fund:

Co-funded by the Major National Oil and Gas Special Projects(No.2017ZX05001)and CNPC Science and Technology Project(No.2016B-0302-01)

Corresponding Authors: Zhang Zhi-Jie,born in 1977,is a senior geologist in Research Institute of Petroleum Exploration & Development,PetroChina. She is mainly engaged in researches of petroleum geology,sedimentology and reservoir geology. E-mail: zhzhijie@petroChina.com.cn.

About author: Wang Meng-Shi,born in 1992,is a master degree candidate. She is mainly engaged in researches of sedimentology and reservoir geology. E-mail: 2451881878@qq.com.

Cite this article:

Wang Meng-Shi,Zhang Zhi-Jie,Zhou Chuan-Min et al. Lithological characteristics and origin of alkaline lacustrine of the Lower Permian Fengcheng Formation in Mahu Sag, Junggar Basin[J]. JOPC, 2018, 20(1): 147-162.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.01.010 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I1/147

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