湖平面升降对混积咸化湖盆碳酸盐岩储集层的控制:以柴达木盆地英西地区古近系下干柴沟组上段为例<sup>*</sup>

doi:10.7605/gdlxb.2018.05.060

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Abstract

Based on analyses of cores,thin sections,scanning electron microscope,well-logging,X-ray diffraction and physical properties of the Upper Member of the Paleogene Lower Ganchaigou Formation(i.e. E_2-3xg²)in the Yingxi area of Qaidam Basin,this paper aims to investigate the influence and control of lake-level fluctuations on the formation and distribution of mixed saline lacustrine carbonate reservoir. Deposited in a saline lacustrine basin,the carbonate reservoir of the E_2-3xg² in the Yingxi area contains mixed lithologies and stacking sedimentary cycles resulting from multiple sets of lake-level fluctuations. The rock structure and mineral composition of the E_2-3xg² show similar periodical changes associated with the lake-level fluctuation cycles. Multiple reservoir types,dominated by mixed saline lacustrine carbonates,are present in this area. The vertical evolution and distribution of physical properties of various reservoirs have a good coupling relationship with a single lake-level fluctuation cycle. From bottom to top,the pore assemblage is characterized by primary intercrystalline micropores,slightly dissolved micropores,and dissolved pores. Accordingly,reservoir physical properties tend to get better upward. The formation mechanism and spatial distribution of various reservoirs are mainly controlled by the fluctuation of lake level. The reservoir dominated by dolomite intercrystalline micropores is developed during the early-to-mid regression when strong evaporation and concentration of water prompt penecontemporaneous dolomitization. This reservoir type is characterized by moderate reservoir property but wide distribution. Reservoirs dominated by slightly dissolved and expanded micropores and dissolved pores,however,are formed during the late regression. They are mainly developed in the ancient landform highlands,which are more likely to be exposed and altered by meteoric freshwater dissolution. Therefore,these reservoirs are characterized by good reservoir property but local distribution.

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	Articles by authors
	Xiong Ying
	Wu Kun-Yu
	Tan Xiu-Cheng
	Zhang Yong-Shu
	Yang Bo
	Ren Ling
	Liu Ling
	Liu Yun
	Qiao Yan-Ping
	Wang Xiao-Fang

Key words： lake-level fluctuation mixed carbonate saline lacustrine basin reservoir genesis Lower Ganchaigou Formation Yingxi area Qaidam Basin

Received: 26 June 2018

ZTFLH:

P588.24+5

Fund:

“Thirteen-five” National Science and Technology Major Project(No. 2016ZX05004002-001)

Corresponding Authors: Tan Xiu-Cheng,born in 1970,is a professor and Ph.D. advisor of Southwest Petroleum University. He is mainly engaged in the researches on carbonate sedimentology and reservoir geology. E-mail: tanxiucheng70@163.com.

About author: Xiong Ying,born in 1993,is a doctoral candidate of Southwest Petroleum University. He is mainly engaged in the study of reservoir geology. E-mail: xiongying511602@163.com.

Cite this article:

Xiong Ying,Wu Kun-Yu,Tan Xiu-Cheng et al. Influence of lake-level fluctuation on the mixed saline lacustrine carbonate reservoir: A case study from the Upper Member of Paleogene Lower Ganchaigou Formation in the Yingxi area of Qaidam Basin[J]. JOPC, 2018, 20(5): 855-868.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.05.060 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I5/855

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