地质科学Issue(3)：589-606,18.
四川多旋回叠合盆地的形成与演化
Formation and evolution of multi-cycle superposed Sichuan Basin, China
摘要
Abstract
The Sichuan Basin is a kind of classic cratonic basin having undergone multi-stage evolution, and is rich of gas resources in the different sets of sedimentary sequences. It boasts its long history of gas development and utilization, and a number of recently discovered giant gas fields such as Puguang,Longgang,Hechuan,Xinchang,Jiulongshan,and Yuanba. To explore the processes of formation and evolution of Sichuan Basin is not only an important aspects for addressing the genetic mechanism of cratonic basins, but also a key clue for recognizing the critical conditions of oil and gas accumulation and preserve under the strongly modified tectonic settings. Considering the adjacent plate tectonic evolution, and combing the basin depositional filling with the developing of the peripheral orogenic belts,the paper takes advantage of using the newly released data on surface geology, drilling, gravitational and magnetic, and seismic profiles to address the basin evolution history and its superposed processes of Sichuan Basin and around area. The Sichuan Basin is founded upon the Middle and Upper Yangtze Craton, exhibiting characteristics of the intra-continental deformation and basin development under the adjacent plate tectonic circumstances in the Phanerozoic Eon. With the Qingling Ocean to the north,which was the North Qingling Ocean in Early Paleozoic and the South Qinling Ocean in Late Paleozoic to Triassic respectively, the paleo-Tethyan oceans such as the Changning-Menglian Ocean, Jinshajing-Mojiang Ocean, and Gantze-Litang Ocean to the southwest, the Early Paleozoic Jiangnan-Xuefeng rift-sag to the southeast and the Late Paleozoic Longmenshan rift-sag to the northwest, the Sichuan Basin and its adjacent area had undergone three stages of proto-Tethyan, paleo-Tethyan, and neo-Tethyan evolution controlled by the opening and closing of these oceans and rift-sags. Each stage includes the extension relating to the opening of oceans and the amalgamation and compression relating to the closing of oceans, giving rise to the extensional basins during the Sinian to Ordovician, Devonian to the sedimentary period of the third member of Xujiahe Formation, and Early and Middle Jurassic alternating with the compression basins during the Silurian, the sedimentary period of the fourth to sixth member of Xujiahe Formation, and the Late Jurassic to Quaternary respectively. The basin cycles had resulted in the horizontally combination and vertically superimposition of proto-type basins, producing a distinct kind of geological structures called as stratified and blocked. Influenced by the multi-periods of interaction between the basin and the orogenic belts, the stratified and blocked basin structure has been intensively modified, and played a great role in the oil and gas accumulation in the basin.关键词
成盆机制/地质结构/构造旋回/叠合盆地/四川盆地Key words
Mechanism of basin formation/ Geological structure/ Tectonic cycle/Superimposed basin/ Sichuan Basin分类
天文与地球科学引用本文复制引用
何登发,李德生,张国伟,赵路子,樊春,鲁人齐,文竹..四川多旋回叠合盆地的形成与演化[J].地质科学,2011,(3):589-606,18.基金项目
国家自然科学基金重点项目(编号:40739906)、国家油气专项(编号:2011ZX05008-001)和国家重点基础研究发展计划项目(编号:2011CB201100)资助. （编号:40739906）
