川中广安地区上三叠统须家河组岩相组合与沉积特征  

Lithofacies association and depositional characteristics of the Upper Triassic Xujiahe Formation in Guang'an Area,Central Sichuan Basin

作　　者：张志杰[1] 李伟[1] 杨家静[2] 杨晓萍[1] 李登华[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]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：《地学前缘》2009年第1期296-305,共10页Earth Science Frontiers

基　　金：中国石油勘探开发研究院课题(XNS14JS2005)

摘　　要：根据露头剖面、钻测井资料,分析和总结了川中广安地区上三叠统须家河组(T3x,原称香溪群)的岩相组合、沉积特征及有利储层评价。研究区内须家河组可识别出11种岩相类型、7种岩相组合。川中广安地区在须家河组沉积时期,主要发育了湖泊沉积体系和3个三角洲沉积体系,三角洲砂体以三角洲平原辫状河道与三角洲前缘水下分支河道微相的正韵律砂体叠置发育为特征,三角洲体系中的主干河道叠置带明显控制了有利储层的平面分布,三角洲平原-前缘的过渡区为最有利储层的发育区。Based on the division of the Upper Triassic Xujiahe Formation and the correlation between the field outcrops and the wells in Guang＇an Area, Central Sichuan Basin, we have studied the lithofacies association, depositional characteristics and favorable reservoir in detail. Braided delta systems and shore-shallow lacustrine systems are the major types of depositional systems of the Xujiahe Formation in Guang＇an Area. In the study area of the Xujiahe Formation, 11 lithofacies types and 7 lithofacies associations have been distinguished. Delta sandbodies are characterized by the superposition of sandbodies of braided channels with those of subaqueous distributary channel. The superimposing belts of major channels obviously control the distribution of favorable reservoirs in the braided delta systems, and the transitional zones from the delta plain to the delta-front are the favorable reservoir zones.

关 键 词：川中广安 须家河组 岩相组合 沉积特征 有利储集相带 

分 类 号：TE121.3[石油与天然气工程—油气勘探]