四川盆地南缘长宁地区五峰组—龙马溪组页岩内多源石英对页岩气富集的意义<sup>*</sup>

doi:10.7605/gdlxb.2023.04.068

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Abstract

Quartz is a common mineral in shale,but it has a complex origin,which is of great significance for shale gas enrichment. It is particularly tricky to identify the quartz origin after the diagenetic process. In order to identify the sources and genesis of quartz minerals in the shale of Wufeng-Longmaxi Formation in Changning area,southern Sichuan Basin,environmental scanning electron microscope(SEM),X-ray diffraction(XRD),and helium porosity and total organic carbon(TOC)were studied. The results show that: (1)There are three types of quartz,including extrabasinal,intrabasinal,and authigenic quartz in the Wufeng-Longmaxi shale of the Changning area,the southern Sichuan Basin. (2)The high flux of extrabasinal(terrigenous)quartz diluted the abundance of organic matter in the 3rd layer of Long 1 member,resulting in a general trend of TOC first increasing and then decreasing with the increase of quartz content. (3)Intrabasinal quartz content correlates positively to TOC content,suggesting that the high abundance of plankton opal skeleton was coupled with the high productivity of organic matter. However,due to the higher preservation efficiency of biological opals compared with organic matter in the weak oxidation or oxidation background of the seabed,the correlation coefficient between clastic quartz and TOC is abnormally high. (4)Intrabasinal quartz is positively correlated with helium porosity because of the generation of secondary organic pores by the thermal cracking of organic matter that was initially produced with intrabasinal quartz. However,authigenic quartz generated by clay mineral transformation is negatively correlated with helium porosity,which is due to the filling of some primary or secondary pores by authigenic quartz.

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	Articles by authors
	CHEN Zengyu
	LIU Rui
	TAN Xiucheng
	JING Cui
	NIE Zhou
	HENG De
	JIANG Dingchuan
	WEN Ran
	CHEN Lei
	TANG Yufeng
	TANG Kui

Key words： shale gas intrabasinal quartz organic matter preservation shale pore Wufeng-Longmaxi Formations Sichuan Basin

Received: 22 September 2022

ZTFLH:

P618.13

Fund:

National Natural Science Foundation of China “Pore and fracture evolution of organic rich shale and differential enrichment mechanism of shale gas”(No.42072184)and the Science and Technology Cooperation Project of Innovation Consortium of PetroChina and Southwest Petroleum University(No.2020CX010300)

Corresponding Authors: LIU Rui,born in 1989,associate researcher,is engaged in oil and gas accumulation mechanism,unconventional oil and gas geology research. E-mail: Liurui@outlook.com.

About author: CHEN Zengyu,born in 1999,master degree candidate of Southwest Petroleum University,is engaged in unconventional oil and gas geology research. E-mail: 1952253861@qq.com.

Cite this article:

CHEN Zengyu,LIU Rui,TAN Xiucheng et al. Implications of multi-source quartz on shale-gas enrichment in the Wufeng-Longmaxi shale of Changning area in southern margin of Sichuan Basin, China[J]. JOPC, 2023, 25(4): 920-930.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2023.04.068 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2023/V25/I4/920

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