Pore-infillings in Stratiform Siliceous Rocks of the Dengying Formation in Wangcang Area, Northern Sichuan Basin

doi:10.11885/j.issn.16745086.2019.09.03.01

Abstract

Abstract: Dissolution pores within stratiform siliceous rocks of the Sinian Dengying Formation in Wangcang Area (Northern Sichuan) are filled with multistage minerals. Petrological and geochemical analyses are conducted to reveal the filling sequence of minerals and elucidate the process of fluid interaction. The results show that dolomite, aphanitic-fibrous chalcedony, fine-mesocrystalline quartz and coarse-megacrystalline quartz are typical fillings in the dissolution pores of siliceous rocks, corresponding to six episodic fluid events. After formation of early siliceous rocks, semi-filling saddle dolomite was formed by the dissolution-filling superposition of magnesium-rich hydrothermal fluid derived from deep basin in the first stage. Sparry calcite was formed during the second stage by replacement of siliceous hydrothermal fluid. In the third stage, asphalt was formed in the Silurian to Devonian. Hereafter, the microcrystalline quartz and fibrous chalcedony were formed by hydrothermal solution in closed system during the fourth stage. The fine-mesocrystalline quartz and coarse-megacrystalline quartz were precipitated in the fifth stage and sixth stage, respectively. The fine-mesocrystalline quartz was formed by siliceous fluids during the Carboniferous to Permian, and the coarse-megacrystalline quartz was formed by weak-saturated silica aqueous precipitation along fracture or near-equilibrium conditions in the pores during the Triassic. The superimposition of magnesium-rich hydrothermal fluids and siliceous hydrothermal processes in deep basins can improve stratiform siliceous rocks, and some siliceous rocks with dolomite moldic pores and fractures are suspective special reservoirs.

Key words: Northern Sichuan Basin, Dengying Formation, siliceous rocks, pore-infillings, hydrothermal fluid

CLC Number:

TE122

LIU Xiaohong, SHI Zhangjun, FENG Mingyou, WANG Liangjun, WANG Xingzhi. Pore-infillings in Stratiform Siliceous Rocks of the Dengying Formation in Wangcang Area, Northern Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(3): 1-11.

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