Petroleum Exploration and Development

HUANG Jixin, WANG Hongjun, XU Fang, YANG Mengying, ZHAO Junfeng, LI Peijia, LI Chenqing, LIU Zeqiang, XIONG Ying, TAN Xiucheng

Petroleum Exploration and Development, 2025, 52(4): 982-1000. DOI: 10.1016/S1876-3804(25)60617-3

		Shore-shallow lacustrine mud		Mudstone, micrite, pellet-bearing micrite, shell-bearing micritic marl, siliceous micrite	Horizontal beds, siliceous bands, siliceous nodules
Brackish water-saltwater lacustrine
	Shore-shallow lacustrine
		Microbial mound	(Fruticose/arboreous/ dendritic) skeleton mound	Fruticose skeleton limestone, arboreous skeleton limestone, dendritic skeleton limestone	Biological skeleton structure, skeleton pores, stromatolite structure
			Pelleted mound	Pelleted limestone, micritic pelleted limestone	Laminated, ball-like crystal
			Inter-mound	Pelleted micrite, pellet-bearing micrite, micrite	Lamellar fine-grained deposits between mounds
		Granular shoal	Arenaceous/rudaceous shoal	Arenaceous limestone, rudaceous limestone	Inverse graded bedding
			Shelly shoal	Shell limestone, micritic shell limestone, ostracoid limestone	Inverse graded bedding, ostracoid fossils, complete bivalve shells
			Shell-debris shoal	Shell-debris limestone, micritic shell- debris limestone	Inverse graded bedding, bio-debris
			Inter-shoal	Shell micrite, micritic shell-debris limestone, micrite, shell-debris micrite	Lamellar fine-grained deposits between shoals

Table 1. Types and characteristics of sedimentary facies in Lower Cretaceous SQ1-SQ3 sequences of M block in Santos Basin

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