陆相淡水湖盆页岩有机质富集主控因素研究: 以四川盆地东北部侏罗系自流井组为例<sup>*</sup>

doi:10.7605/gdlxb.2023.04.062

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Abstract It is of great significance to study the enrichment mechanism of organic matters and the associate main controlling factors of shale strata in continental freshwater lacustrine,which can guide the exploration and development of continental shale oil and gas. Lacustrine shales are developed in Dongyuemiao member and Da'anzhai member of Jurassic Ziliujing Formation in Sichuan Basin,which has great potential for oil and gas exploration. Its organic matter enrichment mechanism needs to be explored. Taking those shales in Ziliujing Formation as the research object,core description,thin section observation,electron microscopy scanning,measuring organic carbon content,kerogen microscopic analysis,and main and trace elements test were carried out to restore the sedimentary palaeoenvironment and then examine the main controlling factors of organic matter enrichment. The results show that the organic carbon content of Ziliujing Formation shale ranges from 0.29% to 3.43%,with an average value of 1.32%. Kerogen type index was mainly distributed in the range of 24-52,with an average of 37,indicating that organic matter was type Ⅱ₁ and type Ⅱ₂. Organic matter mainly came from the mixture of aquatic organisms,and terrestrial higher plants. The values of C,Sr/Cu,CIA,and Sr/Ba,and palaeo-salinity,proxies of palaeoclimates,indicate that the Sichuan Basin was a freshwater lacustrine in humid climate during the deposition of Ziliujing Formation. The medium productivity of lacustrine water provides sufficient material basis for the enrichment of organic matter. The oxygen-rich bottom water leads to the oxidation of organic matter,which is not favorable for the enrichment of organic matters. The analysis of cross plot of TOC and several palaeoenvironmental proxies show that organic matter enrichment in Ziliujing shales is mainly controlled by the palaeo-productivity,palaeo-climate,and deposition rate. Organic matter can be enriched only under the background of relatively humid climatic conditions,relatively high productivity,and appropriate deposition rate. Redox conditions and salinity are not the main controlling factors of organic matter enrichment in freshwater lacustrine shales,which is quite different from marine shales and saline lacustrine shales.

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	Articles by authors
	ZHANG Meizhou
	ZHU Xiaomin
	JIANG Zhenxue
	ZHU Deyu
	YE Lei
	CHEN Zhiyuan

Key words： Sichuan Basin Jurassic Ziliujing Formation shale trace elements organic matter main controlling factor

Received: 11 March 2023

ZTFLH:

P588.22

Fund:Strategic Cooperation Science and Technology Special Project between China National Petroleum Corporation and China University of Petroleum (Beijing)(No.ZLZX2020-02)

Corresponding Authors: ZHU Xiaomin,born in 1960,is a professor and Ph.D. supervisor. He is mainly engaged in teaching and research work in sedimentary geology and reservoir geology. E-mail: xmzhu@cup.edu.cn.

About author: ZHANG Meizhou,born in 1993,is a Ph.D. candidate at China University of Petroleum(Beijing). He is mainly engaged in fine-grained sedimentology and reservoir geology. E-mail: zmzgeo@163.com.

Cite this article:

ZHANG Meizhou,ZHU Xiaomin,JIANG Zhenxue et al. Main controlling factors of organic matter enrichment in continental freshwater lacustrine shale: a case study of the Jurassic Ziliujing Formation in northeastern Sichuan Basin[J]. JOPC, 2023, 25(4): 806-822.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2023.04.062 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2023/V25/I4/806

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