四川盆地中部地区下寒武统龙王庙组混积特征及其地质意义

doi:10.11743/ogg20210309

Abstract

Abstract:

The mixed siliciclastic and carbonate sediments that prevail the Lower Cambrian Longwangmiao Formation in the central Sichuan Basin are poorly understood.Their characteristics and geological significances are therefore focused in this study through core description and petrologic analysis.The results show that mixed carbonate-siliciclastic deposition dominates the formation as carbonate-mixed carbonate-siliciclastic sequences and mixed carbonate-siliciclasitic sequences in gradually mixing or type Ⅱ composite mixing styles.Vertically, the sediments are clearly storm-related and controlled by sea level variations in transgression and early regression stages of the third-order eustatic cycle with the mixing range much larger in transgression than that in regression stage.Horizontally, the sediments show higher mixing intensity in the Gaoshiti area than in the Moxi area.A characteristic comparison between the sediments of the formation in the central and northern Sichuan Basin reveals that sediments in the northern part of the basin have higher mixing intensity and greater granular size due to its adjacency to the Qinling Palaeocean and Motianling Palaeoland and a possible influx of terrigenous debris brought by storms through the north part to the center.The mixed sediments in the central Sichuan Basin indicate that Gaoshiti area was lying on a palaeo-slope where silty quartz grains were unloaded to form a mixing deposition center.It is also highly possible that quality reservoirs in the formation occur mostly in the weakly to non-mixing sediments of shoal facies, since highly mixed sediments are not suitable for the formation and development of such reservoirs.

Key words: mixed sediment, sedimentary setting, geological significance, Longwangmiao Formation, Cambrian, Sichuan Basin

CLC Number:

TE121.2

Jinmin Song, Yaxiong Zhang, Kewei Yin, Shugen Liu, Zongyu Chen, Zhiwu Li, Yanhong Tian, Wei Sun, Ying Liu, Xin Jin, Lingli Zhao. Characteristics and geological significance of mixed sediments in the Lower Cambrian Longwangmiao Formation, central Sichuan Basin[J]. Oil & Gas Geology, 2021, 42(3): 627-638, 701.

Figures/Tables 8

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Table 1

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对比项	川中地区	川北地区
石英含量/%	5~40	15~90
石英粒径/mm	< 0.10	0.10~0.25
石英产状	沿缝合线分布；分散于基质中；与碳酸盐颗粒相接触；充填于碳酸盐颗粒间；碳酸盐颗粒内部	沿缝合线分布；分散于基质中；与碳酸盐颗粒相接触；碳酸盐颗粒间；碳酸盐颗粒内部；碎屑岩组分
混积强度	1，2级为主，最高3级	1，2级为主，最高4级
混积岩性	混积型碳酸盐岩	混积型碳酸盐岩、混积型碎屑岩、高度混积岩
混积层系	碳酸盐岩-混积岩层系、混积岩层系	陆源碎屑岩-碳酸盐岩层系、碳酸盐岩-混积岩层系、混积岩层系
混积类型	渐变式、复合式Ⅱ	渐变式、复合式Ⅱ
混积发育段	高石梯为全井段、磨溪中下段	龙王庙组全段
风暴作用强度	高石梯最强、磨溪地区次之	弱
与物源区距离	远	近
储层厚度/m	30~70	15~50
颗地比/%	38~85	15~35
面孔率%	2~15	2~9
储集空间	粒间溶孔、粒内溶孔、晶间溶孔	粒间溶孔、晶间孔
沥青含量/%	1~15	0.5~2.0
沥青产状	弥散状	斑点状

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Characteristics and geological significance of mixed sediments in the Lower Cambrian Longwangmiao Formation, central Sichuan Basin

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