鄯勒油田西山窑组层序地层格架及其油气地质意义  

Sequence Stratigraphic Framework and Geological Significance for Petroleum of Xishanyao Formation in Shanle Oilfield

作　　者：李松[1] 汤达祯[1] 王炜[2] 许浩[1] 杨紫[1] 陈晓智[1] 崔立伟[1] 

机构地区：[1]中国地质大学海相储层演化与油气富集机理教育部重点实验室/能源学院,北京100083 [2]中国石油天然气股份有限公司吐哈油田分公司,新疆鄯善838200

出　　处：《吉林大学学报（地球科学版）》2011年第4期983-991,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家'973'计划项目(2009CB219600)

摘　　要：运用层序地层学的基本原理和技术方法,建立鄯勒油田西山窑组层序地层格架,划分沉积相,并在此基础上分析层序地层格架内砂体的展布特征和油气的聚集规律,预测研究区岩性油气藏的类型及分布。研究结果表明:西山窑组整体经历了一个先进积、后退积的过程;西山窑组为一个三级层序,其中包含2个四级层序,该组由低位域(LST)的三角洲前缘沉积、湖侵域(TST)的三角洲平原沉积和高位域(HST)的湖相沉积组成。研究区基准面上升期可以寻找砂体上倾尖灭型岩性圈闭,基准面下降期可以寻找砂岩透镜体岩性圈闭。西一、二段沉积的三角洲河道砂体受后期构造运动的影响,可以形成砂体上倾尖灭型岩性油气藏;而西三、四段的湖相浊积砂体,可以形成砂岩透镜体岩性油气藏。The sequence stratigraphic framework and classify sedimentary facies of Xishanyao Formation are established by the basic principles and technical methods of sequence stratigraphy in Shanle oilfield.On the basis,the distribution characteristics of sandstone and the rules of hydrocarbon accumulation within the sequence stratigraphic framework are analyzed and the lithologic reservoir＇s types and distribution are predicted.The results show that： Xishanyao Formation experienced an integral cycle of transgression-regression,and Xishanyao Formation is a third-order sequence,which contains two fourth-order sequences.The formation consists of delta front deposition in lowstand system tract,delta plain deposition in transgressive system tract and lacustrine fine sediments in highstand system tract.In the study area lithologic updip pinch out traps can be found in the increasing base level cycle,and sand lens lithologic traps can be sought on the descending base level cycle.Respectively,the delta channel sand in the first and second fragments of the Xishanyao Formation can form the updip pinch out reservoirs under the affect of the later tectonic movements;and the lacustrine turbidite sand body in the third and fourth fragments of the Xishanyao Formation can form sand lens lithologic reservoirs.

关 键 词：层序格架 油气 鄯勒油田 西山窑组 

分 类 号：P534.52[天文地球—古生物学与地层学]