海相油气地质2013，Vol.18Issue(3)：19-28,10.DOI:10.3969/j.issn.1672-9854.2013.03.003
四川盆地中—上寒武统层序地层划分与沉积模式
Division and Sedimentary Model of Middle-Upper Cambrian Sequence Strata in Sichuan Basin
摘要
Abstract
According to the observation of the field outcrop profiles at Fandian,Yankong and Sanhuichang,and the sequence boundary characters and succession analysis of two connecting well sections cross Sichuan Basin,the Cambrian strata can be divided into 12 third-order sequences,named as SQ1 to SQ12 from lower to upper,which include SQ1 to SQ6 in lower Cambrian Series and SQ7 to SQ12 in middle to upper Cambrian Series.Several shallowing-upward cycles develop in the middle-upper Cambrian strata,which include lagoons to platform inner shoals,lagoons to tidal flats,and platform inner shoals to tidal flats.The middle-upper Cambrian sediments are the tidal flat-platform inner shoals-lagoon facies from west to east and the thickness of sediments show a varying pattern that is thick in the east and thin in the west,which is complementary to Lower Cambrian sediments.The total thickness of HST is thicker than that of TST in middle-upper Cambrian strata (SQ7-SQ12) so that it is generally characterized of fast transgression and slow regression.Semi-closed shallow-water carbonate platform gradually formed in the east and shoreline developed in the west in the SQ7 during middle Cambrian epoch.The middle Cambrian sedimentary model was inherited in SQ8 to SQ12 during upper Cambrian but more platform inner shoals developed in the west due to the weakening influence of the terrestrial detritus input and shallowing water.The platform inner shoals generally develop in the middle to top parts of HST invertical and in the center and eastern parts of Sichuan Basin in plan.关键词
四川盆地/上寒武统/中寒武统/层序地层/层序划分/沉积模式Key words
Cambrian/ Sequence stratigraphy/ Sequence division/ Sedimentary model/ Sichuan Basin分类
能源科技引用本文复制引用
袁立,姚君波,李国蓉,彭博,麻宇杰..四川盆地中—上寒武统层序地层划分与沉积模式[J].海相油气地质,2013,18(3):19-28,10.基金项目
本文受国家重大专项专题"海相碳酸盐岩沉积层序与储层发育模式研究"(编号:2011ZX05005-002-009HZ)资助 （编号:2011ZX05005-002-009HZ）
