川西坳陷中段侏罗系蓬莱镇组沉积相展布及演化  

The Sedimentary Facies Distribution and Evolution of Penglaizhen in the Middle Jurassic Strata of Western Sichuan Depression

作　　者：张田[1] 陈恭洋[2] 罗迎春[3] 黄文芳[1] 宋雅慧[1] 张朝婵 

机构地区：[1]长江大学地球科学学院,荆州434023 [2]长江大学计算机科学学院,荆州434023 [3]长江大学资源信息研究所,荆州434023

出　　处：《科学技术与工程》2014年第21期205-209,218,共6页Science Technology and Engineering

摘　　要：在对川西坳陷中段侏罗系蓬莱镇组地层进行了32条野外剖面观察后,得出蓬莱镇组整体的沉积格局,主要有冲积扇、辫状河三角洲、曲流河三角洲、湖泊相以及河流相。通过对岩心资料、分析化验、砂岩百分比、地震资料的分析后绘制出了蓬莱镇组29个小层及4个段的砂岩百分比等值线图,并确定了东部物源及东部三角洲的存在。对蓬莱镇组沉积层序进行了系统的研究后,并在地震资料的约束下,绘制出了蓬莱镇组4个段的沉积相图,对蓬莱镇组时期沉积演化取得了以下几点认识:1蓬莱镇组沉积初期至末期,湖盆整体呈现出减小的趋势;2蓬四段沉积末期,湖盆减小至最小;3蓬莱镇组沉积期间,湖盆规模有周期性变化特点,但总体上湖盆是减小的。After 32 outcrops of Penglaizhen Jurassic strata in observed, the overall deposition pattern can be obtained, mainly delta, lacustrine and fluvial. Through the core data, laboratory of seismic data, 29 maps of small percentage of sandstone layers ven been drawn, and to determine the existence of the eastern sedimentary sequence of Penglaizhen sections of Penglaizhen, the following the middle of the Western Sichuan Depression are alluvial fan, braided river delta, meandering river analysis, the percentage of sandstone, the analysis and the contours four segments of Penglaizhen ha- provenance and eastern Delta. After studying the and under the constraints of seismic data to map out four phases sedimentary understanding from the evolution of the group during the deposition of Pen- glaizhen can be concluded： （1） the initial deposit to the late, the basin showed as a whole decreasing trend; （2） During the final deposition period, the lake was reduced to a minimum; （3） During the deposition period, the scale of the basin changes in cyclical features, but on the whole the basin is reduced.

关 键 词：侏罗系 蓬莱镇组 沉积相 

分 类 号：TE121.32[石油与天然气工程—油气勘探]