四川盆地及其周缘五峰组-龙马溪组细粒沉积的层序地层与岩相特征

doi:10.11743/ogg20220502

Abstract

Abstract:

This paper takes the shale samples from the Wufeng Formation and the first member of Longmaxi Formation in the Sichuan Basin and its periphery as the research subject. Through the comparative analysis of drilling data， core and outcrop analysis， and test data， a study on the sequence stratigraphic division and correlation， lithofacies classification and identification， and sedimentary microfacies-lithofacies distribution of the rocks is carried out. The results show that the fine-grained deposits of study interval can be divided into three third-order sequences （SQ1， SQ2， and SQ3）， which are subdivided into seven systems tracts. High-quality shales are mainly distributed in the transgressive systems tracts （TST） of the three sequences， of which high-quality shales of SQ2-TST are the most widely distributed. The lithofacies are mainly organic siliceous shale， organic-rich limy siliceous shale， and medium-high organic siliceous argillaceous shale. The regional distribution of different types of inorganic minerals is clarified. The contents of carbonate minerals are relatively high near the central Sichuan paleo-high and northern Guizhou Uplift. With the increase of water depth， the contents of clay minerals and quartz minerals gradually increase. The sedimentary-lithofacies of SQ2-TST is mapped by using the contour maps of the content of three terminal principal minerals （quartz， clay， and carbonate） and the content of total organic carbon （TOC）， in combination with the contour maps of parameters such as geochemical parameters （Th/U） and isopachous maps. On the periphery of the central Sichuan paleo-high， central northern Guizhou paleo-high， and northern Sichuan paleo-high， medium-low organic argillaceous shales and medium-low organic limy siliceous argillaceous shales deposited. In the deep-water shelf of southern Sichuan Basin enclosed by the central Sichuan paleo-high and central northern Guizhou paleo-high， organic-rich limy siliceous argillaceous shales are mainly deposited. organic-rich siliceous shales are mainly developed in the Fuling area extending to the northeast of the Sichuan Basin.

Key words: fine-grained deposits, sequence stratigraphy, lithofacies, Wufeng Formation, Longmaxi Formation, Sichuan Basin

CLC Number:

TE121.3

Zongquan Hu, Wei Du, Tong Zhu, Zengqin Liu. Sequence stratigraphy and lithofacies characteristics of fine-grained deposits of Wufeng-Longmaxi Formations in the Sichuan Basin and on its periphery[J]. Oil & Gas Geology, 2022, 43(5): 1024-1038.

Figures/Tables 11

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三级层序	体系域	岩性		测井		古生物	地球化学
三级层序	体系域	矿物成分	接触关系	GR曲线形态	Th/U	笔石带	TOC/%
龙马溪组一段上部（SQ3）	HST	含粉砂质粘土质岩、含灰质粘土质页岩	顶突变	箱形持续加积型	>2	LM8	1～2
龙马溪组一段上部（SQ3）	TST	粘土质页岩、（含灰质）粘土质页岩	底突变	齿形退积-进积交互型	1~2	LM7	2～3
龙马溪组一段下部（SQ2）	LHST	上部粉砂质页岩、下部灰质粘土质页岩	顶突变	箱形持续加积型	>2	LM5—LM6	上部1～2，下部2～3
	EHST	粘土质硅质页岩、含灰质硅质页岩	渐变	橄榄形退积-进积型	1～2	LM4—LM5	2～4
	TST	硅质页岩	底突变	指状-箱状退积型	<1	LM1—LM3	>4
五峰组（SQ1）	HST	介屑灰岩	顶突变	漏斗形退积型	<1	WF4	<1
五峰组（SQ1）	TST	上部硅质页岩、下部灰质粘土质页岩	底渐变或突变	漏斗形退积型	<1	WF1—WT3	上部>2，下部1~2

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Sequence stratigraphy and lithofacies characteristics of fine-grained deposits of Wufeng-Longmaxi Formations in the Sichuan Basin and on its periphery

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