川西前陆盆地侏罗系三角洲沉积体系与沉积模式

THE JURASSIC DELTA DEPOSIT SYSTEM TRACT AND SEDIMENTATION MODEL IN THE WESTERN SICHUAN FORELAND BASIN, CHINA

胡晓强 陈洪德 纪相田 张闻林

Hu Xiaoqiang Chen Hongde Ji Xiangtian Zhang Wenlin

成都理工大学沉积地质研究所. 成都, 610059 2. 中国石油西南油气田分公司研究院, 成都, 610061

Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China 2. Institute of Exploration and Development, Southwest Oil and Gas Field Branch Company of CNPC, Chengdu 610061, China

川西前陆盆地侏罗系为陆相碎屑岩沉积,其中的三角洲沉积体系包括湖泊扇三角洲体系和湖泊三角洲体系2类.湖泊扇三角洲体系主要见于上侏罗统遂宁组、莲花口组地层之中,由扇三角洲平原亚相、扇三角洲前缘亚相、前扇三角洲亚相构成.湖泊三角洲体系主要分布于上侏罗统蓬莱镇组等地层中,有长轴三角洲和短轴三角洲2种类型,包含的亚相有三角洲平原亚相、三角洲前缘亚相、前三角洲亚相.川西前陆盆地侏罗系的沉积模式有2种,即冲积扇-河流(冲积平原)-三角洲-湖泊-湖底扇模式及冲积扇-扇三角洲-湖泊-湖底扇模式.

The Jurassic is built of continental clastic deposited sediments in the western Sichuan foreland basin.Its deltaic depositional system is branched out into lake fan delta system and lake delta system.The lake fan delta system,which mainly existed in the Upper Jurassic Suining Formation and Lianhuakou Formation,is made up of fan delta plain subfacies,fan delta front subfacies and prodelta subfacies.The lake delta system,which mainly distributed in the Upper Jurassic Penglaizheng Formation and so on,can be divided into two kinds:apical axis delta and brachy-axis delta,and included delta plain subfacies,delta front subfacies and prodelta subfacies.Sedimentation model of the Jurassic in the western Sichuan foreland basin had two kinds,they are alluvial fan-river (alluvial flat)-delta-lake-lake floor fan model and alluvial fan-fan delta-lake-lake floor fan model.

四川省重点学科“构造地质学”建设基金资助项目(SZD0408).

https://doi.org/10.11781/sysydz200503226