库车坳陷却勒—羊塔井区库姆格列木群底砂岩段高精度层序对比及油气开发意义  

High-resolution Sequence Contrast and Its Oil/Gas Exploitation Significance of Lower Sand Section of Kumugeliemu Group of Quele-Yangta Well District in Kuqa Depression

作　　者：蔡振忠[1,2] 张丽娟[2] 林畅松[3] 雷燕平[3] 苏真真[3] 司宝玲[3] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]中国石油塔里木油田研究院,新疆库尔勒841000 [3]中国地质大学能源学院,北京100083

出　　处：《现代地质》2010年第4期662-668,共7页Geoscience

基　　金：国家重点基础发展规划"973"项目(2006CB202302)

摘　　要：高精度层序地层为密集井网开发井区储层精细对比提供了重要手段。库车坳陷却勒—羊塔井区库姆格列木群底砂岩段以相对稳定的水进面为界进行的高精度层序划分、对比和沉积微相分析结果表明,底砂岩段可划分出4个四级层序和6个五级层序,羊塔井区以干盐湖环境河流三角洲前缘沉积为主,形成3~4套分布较稳定、粒度较细的砂体,物源来自东部和东南部的前缘隆起区,是河流长距离搬运的结果。却勒井区砂体厚度变化较大,可识别出3期较大规模的水进—水退旋回,发育3套厚度较大、近物源的辫状河道、三角洲前缘河口坝和水下分流河道砂体,这些砂体由北西向南东方向变薄,碎屑体系分析表明物源来自西部温宿凸起区。古地理再造表明两井区形成于两套沉积体系,之间有一湖湾分隔,层序—沉积体系的差异和分布决定着储层分布和油田布井开发的方案。High-resolution sequence stratigraphy provides an important method for reservoir finely contrast in dense devoloping well area.Bounded by the relatively steady transgrassive surface,there can be divided 4 4th order sequences and 6 5th order sequences in the lower sand section of Kumugeliemu Formation.Finely sequence contrast and depositional microfacies analysis show that there were mainly delta front deposit of drought salt lake environment in Yangta developing district,and formed 3 to 4 steady distributional fine grain-size sands,which came from eastern and southeastern uplift area,and reflected the fluvial long-distance transportation.In Quele developing district,the sandbody was thicker variable,which reflected the near fan or braided fluvial delta deposit characteristic.Three thick sandbodies wich are in braided channel,delta front mouth bar and sub-distributary channel developed during 3 transgressive-regressive cycles can be recognized.From the northwestern to the southeastern,the sand gradually thinner,and reflected the clastic system coming from western Wensu uplift.Paleo-geography restructure shows that the two well districts developed under two different depositional systems,and there was a bay between them.The difference of sequence and depositional system decided the reservoir distribution and oil field development scheme.

关 键 词：高精度层序地层 沉积体系 油田开发 库姆格列木群底砂岩 却勒—羊塔井区 库车坳陷 

分 类 号：TE121.3[石油与天然气工程—油气勘探]