成都理工大学学报（自然科学版）2026，Vol.53Issue(2)：334-351,18.DOI:10.12474/cdlgzrkx.2024092001
川中—川北地区下寒武统沧浪铺组一段沉积模式
Sedimentary models of the first member of the Lower Cambrian Canglangpu Formation in the central to northern Sichuan Basin
摘要
Abstract
Recently,natural gas exploration in the first member of Canglangpu Formation(Cang-1 member)from Cambrian Series 2 in Sichuan Basin reached a major breakthrough.However,conclusions regarding its sedimentary systems,and changes of the facies zones,are still unclear,which restricts the oil and gas exploration process in this region.In this paper,we clarify the distribution characteristics and sedimentary pattern of gas using outcrop section measurements,core description,thin section identification,and the interpretation of seismic data of the Cang-1 member.The following research results are obtained:Cang-1 in the central Sichuan Basin has a thickness of 70 to 90 m.Under the control of the Mianyang-Changning intracratonic sag and central Sichuan ancient uplift,shelf facies,slope facies,and carbonate platform margin facies with oolitic dolomite(with a relict texture),(sandy)oolitic limestone,calcareous siltstone,argillaceous siltstone,and calcareous mudstone as the main lithology developed.However Cang-1 in the northern Sichuan Basin has a thickness of 90 to 150 m.Under the control of the Han-Nan ancient continent,the Mianyang-Changning intracratonic sag,and the Jiange-Wangcang sag,shelf facies,slope facies,carbonate platform margin facies,and open platform facies with(silty)sandy oolitic dolomite,sandy dolomite,(sandy)oolitic limestone,biohermal limestone,sandy limestone,argillaceous limestone,and calcareous siltstone as the main lithology developed.Grain shoals developed under the joint influence of the Paleogeomorphic highlands,Mianyang-Changning intracratonic sag,Jiange-Wangcang sag,sea level,and a supply of mixed siliciclastic material.The distribution of the grain bank of Cang-1 developed horizontally along the margin of the Mianyang-Changning intracratonic sag and the Jiange-Wangcang sag.A sedimentary model of the central to northern Sichuan Basin was established,which shows the area was affected by the Mianyang-Changning intracratonic sag,the Jiange-Wangcang sag,two uplifts on either side of the Jiange-Wangcang sag,a grain bank along the Mianyang-Changning intracratonic sag,and a sag margin along the Jiange-Wangcang sag that formed a belt.关键词
川中—川北地区/下寒武统/沧浪铺组一段/沉积相/沉积模式Key words
central to northern Sichuan Basin/Lower Cambrian/the first member of Canglangpu Formation/sedimentary facies/sedimentary pattern分类
天文与地球科学引用本文复制引用
邓豪爽,马小刚,薛佳敏,张祖兵,杨绍海,罗平,宋金民,刘树根,李智武,田立洲,杨迪,叶玥豪,金鑫,王斌..川中—川北地区下寒武统沧浪铺组一段沉积模式[J].成都理工大学学报（自然科学版）,2026,53(2):334-351,18.基金项目
国家自然科学基金(U2344209) （U2344209）
国家自然科学基金企业创新发展联合基金(U19B6003) （U19B6003）
国家自然科学基金面上项目(41872150). （41872150）
