地质论评2009，Vol.55Issue(4)：484-495,12.
四川类前陆盆地须家河组层序-岩相古地理特征
Sequence-based Lithofacies and Paleogeographic Characteristics of Upper Triassic Xuj iahe Formation in Sichuan Basin
摘要
Abstract
Through the analysis of the tectonic framework and Coupling Process between Basin and Mountain,it can be ascertained that the Sichuan Basin is an analogous foreland basin, of which tectonosedimentary framework was composed of three depressions and one uplift, formed by three systems of coupling process between basin and mountain in the Xujiahe epoch of Late Triassic. Based on the analysis of outcrops,drilling sections, sedimentary facies and sequence stratigraphy of the Xujiahe Formation or the Xiangxi Group, combining with the base-level cycle sequence and isochronic correlation technique, the Xujiahe Formation is divided into two super long-term sequence cycles(SLSC1,SLSC2) and five long-term sequence cycles(LSC1 ～LSC5), which can be correlated in the whole Sichuan Basin. Choosing the rising and falling base-level phases of each long-term sequence cycles as a unit,the sequence-based lithofacies and paleogeographic maps of the Xujiahe Formation have been mapped. The results indicate that the paleogeography,regulation of sedimentary facies distribution, subsidence-sediment center and migration direction are controlled strictly by nonsynchronous thrusting-napping process of the Longmen Mountains, Micang Mountains-Daba Mountains and so-called "three depressions and one uplift "tectonic pattern, which is composed of western Sichuan depression, northeastern Sichuan depression, eastern Chongqing-southwestern Sichuan depression and central Sichuan Palaeo-uplift. Coupling process between basin and mountain possess the features of deroofing in orogenic zone and material cycle between growth, subsidence and filling in a basin. The peculiar tectono-sedimentary pattern entirely control the depositional processes, palaeogeographic features and the source-reservoir-seal combination of the Xujiahe Formation, as well the oil and gas accumulation regularity around the central Sichuan Palaeo-uplift.关键词
四川类前陆盆地/上三叠统须家河组/盆-山耦合/构造-沉积格局/层序-岩相古地理Key words
Sichuan Analogous Foreland Basin/ Xujiahe Formation, Upper Triassic/ coupling process between basin and mountain/ tectono-sedimentary framework/ sequence-based lithofacies and paleogeography分类
天文与地球科学引用本文复制引用
郑荣才,戴朝成,朱如凯,翟文亮,高红灿,耿威..四川类前陆盆地须家河组层序-岩相古地理特征[J].地质论评,2009,55(4):484-495,12.基金项目
本文为国家莺大专项"大型油气田及煤层气开发"(编号2008ZX05000-003-01)的成果. （编号2008ZX05000-003-01）
