准噶尔盆地永进地区齐古组深埋砂岩成岩作用对储集层质量影响的定量表征<sup>*</sup>

doi:10.7605/gdlxb.2024.03.067

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Abstract The Jurassic Qigu Formation in the Yongjin area is a set of important oil-bearing strata in the central Junggar Basin. It is a typical deep-buried sandstone reservoir with a burial depth of 5400~6100 m,and its reservoir quality controls oil and gas reserves and production. In this paper,the diagenetic evolution process of deep-buried sandstone reservoirs in the Qigu Formation is studied by using the data of cast thin section,cathodoluminescence,scanning electron microscopy,XRD whole rock and clay mineral analysis. A diagenetic sequence is established,and the impacts of various diagenetic processes on reservoir quality are quantitatively assessed,integrating regional burial and hydrocarbon charge histories to delineate the reservoir’s diagenetic evolution. The lithology of the Qigu Formation reservoir in the Yongjin area is mainly composed of feldspathic lithic sandstone and lithic sandstone. The cement includes mainly carbonate minerals,siliceous minerals and clay minerals with low composition maturity and high texture maturity. The reservoir space types are mainly the remaining primary intergranular pores and secondary intergranular dissolved pores. Overall,the reservoir porosity changes are mainly controlled by compaction,cementation and dissolution,which are the main diagenetic factors reducing reservoir porosity,resulting in primary pore loss rates of 65.98% and 21.80% respectively. Dissolution increases the porosity by 5.13%,which effectively improves the physical properties of the reservoir. The comprehensive study shows that the diagenetic evolution of the Qigu Formation reservoir in the Yongjin area is mainly controlled by four factors: sedimentary environment,diagenesis,burial history and oil and gas charging. Diagenesis plays a role in the transformation of reservoir physical properties and is the critical determinant of the observed reservoir heterogeneity.

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	HUANG Cheng
	ZHU Xiaomin
	JIN Xuling
	HU Xin
	XIU Jinlei
	REN Xincheng
	CHENG Changling

Key words： quantitative characterization diagenesis pore evolution deep reservoir Qigu Formation Yongjin area

Received: 19 October 2023

ZTFLH:

P618.130.2+1

Fund:Financially supported by the National Natural Science Foundation of China(No.42272110)

Corresponding Authors: ZHU Xiaomin,born in 1960,is a professor and doctoral supervisor. He is mainly engaged in teaching and researches on sedimentary geology and sequence stratigraphy. E-mail: xmzhu@cup.edu.cn.

About author: HUANG Cheng,born in 1998,is a master degree candidate in China University of Petroleum(Beijing). He is mainly engaged in researches on reservoir geology. E-mail: huangxiusun@gmail.com.

Cite this article:

HUANG Cheng,ZHU Xiaomin,JIN Xuling et al. Quantitative characterization of influence of diagenesis on reservoir quality of deep-buried sandstone of the Qigu Formation in Yongjin area,Junggar Basin[J]. JOPC, 2024, 26(3): 683-699.

URL:

http://www.gdlxb.cn/EN/10.7605/gdlxb.2024.03.067 OR http://www.gdlxb.cn/EN/Y2024/V26/I3/683

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