川西地区中二叠统栖霞组沉积特征  

Sedimentary characteristics of the middle Permian Qixia formation in the western Sichuan area

作　　者：苏旺[1] 陈志勇[1] 汪泽成[1] 江青春[1] 张宝民[1] 单秀琴[1] 姜华[1] 卞丛胜[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《东北石油大学学报》2016年第3期41-50,共10页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05004-001)

摘　　要：为明确川西地区中二叠统栖霞组有利沉积相带分布,基于野外露头、岩心和钻测井资料分析,并结合区域地质测量资料,研究岩石类型、沉积模式和沉积相发育特征。结果表明：川西地区栖霞组主要发育生屑灰岩、泥晶灰岩、＂眼球＂状灰岩、砾屑灰岩、云质豹斑灰岩和白云岩6种岩石类型;基于构造背景、跌积砾屑灰岩、大规模带状展布丘滩体和沉积古地貌,研究区发育碳酸盐岩镶边台地体系;川西地区栖霞组自东向西依次发育开阔台地相、台地边缘相和斜坡—盆地相,其中台缘边缘相发育厚层的丘滩复合体,为最有利沉积相带。川西栖霞组台缘带沿龙门山前广元—江油—雅安一带呈北东向展布,宽度为40~80km,分布范围较广,具有良好勘探前景。In order to clarify the distribution of favorable facies belts of the middle Permian Qixia formation in the western Sichuan area and point out its further exploration direction,based on the comprehensive analysis of the field outcrops,cores,drilling wells,logging data,and regional geological survey data,the rock types,sedimentary models and characteristics of Qixia formation were studied.The results indicate that Qixia formation in western Sichuan basin developed mainly six kinds of rock types:bioclastic limestones,microcrystalline limestones,augen-like imestones,calcirudite,dolomitic leopard-spot limestones and dolostone.Qixia formation in western Sichuan area developed rimmed carbonate platform system based on the tectonic background,by-pass calcirudite,large-scale zonal mud mound-bank,and palaeo-geomorphology.Qixia formation in western Sichuan area developed successively the open platform,platform margin and slope-basin facies from east to west,and the platform margin developed the complex of mud mounds and banks,which is the most favorable facies belt.The belt is about 40~80kilometers wide and distributed in north-east direction along Guangyuan-Jiangyou-Yaan in anterior Longmen mountain area,which shows a good exploration prospect.

关 键 词：川西地区 栖霞组 沉积特征 镶边台地 台地边缘 

分 类 号：TE122.2[石油与天然气工程—油气勘探]