四川盆地中二叠统栖霞组层序地层特征及沉积演化模式  

Sequence stratigraphic characteristics and sedimentary evolution model of the Middle Permian Qixia Formation in the Sichuan Basin

作　　者：白晓亮[1] 郗诚 和源 王晶[1] 明盈 BAI Xiaoliang;XI Cheng;HE Yuan;WANG Jing;MING Ying(Research Institute of Petroleum Exploration and Development,PetroChina Southwest Oil and Gas Field Company,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油西南油气田分公司勘探开发研究院,四川成都610051

出　　处：《东北石油大学学报》2020年第6期33-42,I0002,I0003,共12页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2016ZX05007-004)。

摘　　要：以层序地层学理论为指导,综合运用钻井、测井和地震资料,研究四川盆地中二叠统栖霞组层序地层特征及沉积演化模式,确定层序地层格架展布,建立沉积演化模式。结果表明:栖霞组可以划分为Sq1和Sq2两个三级层序旋回,Sq1海侵体系域迅速海侵,造成可容纳空间的增加速率大于碳酸盐岩的生长速率,局部层段可见颗石藻及钙球粒等水体较深的生物组合,反映迅速海侵造成水体突然加深的过程;Sq1高位体系域广泛发育厚层台地边缘颗粒滩相,随海平面的上升,高部位碳酸盐岩的生长速率可以弥补海平面上升(可容纳空间增加)的速率,碳酸盐岩生长以加积为主,发育一套厚层稳定分布的台缘颗粒滩相沉积。二叠系沉积前,古地貌控制栖霞组沉积格局,栖霞组早期沉积是逐渐向古隆起的超覆过程,栖霞组中晚期发育海侵背景条件的碳酸盐岩台地—斜坡—盆地沉积模式,加里东古隆起高部位及岩溶古地貌高部位控制滩相展布。The study of the sequence stratigraphic characteristics and sedimentary evolution model of the Qixia Formation,based on comprehensive integration of seismic data,drill cores and well log data,and divided into two third-order sequences(Sq1,Sq2),and the sequence stratigraphic framework have been built,the Sq1 transgressive system tract characterized by rapid transgression,resulting in an increase in space accommodate rate is greater than the growth rate of carbonate rocks,and some interval visible planktonic foraminifera,coccolith and calcium chondrules biological combination of deep water,indicating that the water deepened quickly caused by the process of transgression;the Sq1 high stand system tract is widely developed platform edge grain beach facies,as sea levels rise,the growth rate of high carbonate can make up for the rate of rising sea level's increase(accommodate space),at this point,carbonate growth in the platform margin beach is aggradation,and develope a set of thick layer of the distribution of the stable platform margin particles beach deposition.In conclusion,the paleogeomorphology of the Pre-Permian controlling the distribution of the sedimentary facies in the Qixia Formation,the early deposition of the Qixia Formation is overlapped gradually to the ancient uplift,the transgressive carbonate platform margin-slope-basin sedimentation model is developed in the middle to late stage,and Caledonian ancient uplift area and karst palaeogeomorphology high position control beach facies distribution.

关 键 词：四川盆地 中二叠统 栖霞组 层序地层 台地边缘 沉积演化模式 

分 类 号：TE121.3[石油与天然气工程—油气勘探]