Sedimentary Characteristics and Evolution Model of Lower Cambrian Canglangpu Formation in Central and Northern Sichuan Basin

doi:10.11885/j.issn.1674-5086.2024.07.21.02

Abstract

Abstract: To deepen the understanding of the sedimentary facies of the Lower Cambrian Canglangpu Formation in the northern part of the Sichuan Basin and clarify the favorable areas for the distribution of carbonate beaches. Based on core, logging, seismic and field outcrop data, this paper studies the sedimentary characteristics and evolution model of the Lower Cambrian Canglangpu Formation. The results show that: 1) The sedimentary facies of Canglangpu Formation in the study area can be divided into four types: muddy water tidal flat facies, mixed platform facies, restricted platform facies and open platform facies. The muddy water tidal flat facies can be divided into two subfacies of intertidal zone and subtidal zone, and the lithology is mainly clastic rock. The mixed platform facies can be divided into two subfacies: platform flat and platform depression, which are dominated by mixed rock deposits. The restricted platform facies and the open platform facies are dominated by carbonate deposits. The former is dominated by dolomite, and the latter is dominated by limestone. 2) From west to east, muddy water tidal flat facies, mixed platform facies, restricted platform facies and open platform facies are successively developed in the first member of Canglangpu Formation under the influence of western terrigenous debris injection and Deyang-Anyue rift trough. 3) During the sedimentary period of the second member of Canglangpu Formation, the early rift trough was almost filled up, and the muddy water tidal flat facies was the main sedimentary facies. In summary, the favorable beach bodies in the study area are mainly developed in the restricted platform-open platform facies on the east side of the pre-rift trough. Affected by the rift trough and regression, the beach bodies gradually migrate eastward.

Key words: sedimentary evolution, sedimentary model, Lower Cambrian, Canglangpu Formation, Sichuan Basin

CLC Number:

TE132

QU Haizhou, YANG Shiyuan, LI Juzheng, WEN Siying, ZHOU Linlang. Sedimentary Characteristics and Evolution Model of Lower Cambrian Canglangpu Formation in Central and Northern Sichuan Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(5): 24-38.

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