摘要
已有研究表明,松辽盆地西斜坡姚家组沉积初期古湖盆大面积暴露地表,形成的姚一段区域性假整合面成为后期油气向西运移的通道,因此,研究姚家组上部地层沉积特征及其控制因素对油气的勘探开发意义重大。通过重矿物分布和小层砂岩百分含量分析,揭示了松辽盆地西斜坡地区姚家组SⅡ+Ⅲ砂组沉积时期受齐齐哈尔和英台双向物源控制。根据古构造层、古地貌形态、水体能量的控制因素分析,结合研究区49口岩心井资料和202口钻测井资料,阐明了西斜坡地区姚家组SⅡ+Ⅲ砂组主要发育水下分流河道、水下分流间湾、远砂坝、河口坝、砂坪、泥坪和混合坪7种微相类型,并总结出SⅡ+Ⅲ4、SⅡ+Ⅲ3、SⅡ+Ⅲ2、SⅡ+Ⅲ14个小层沉积微相平面展布特征及变化规律。研究区姚家组SⅡ+Ⅲ砂组在南北向物源控制下发育的7种微相中,水下分流河道和河口坝为最有利的砂体储集类型;湖水冲刷环境下形成的砂坪和混合坪很可能成为后期湖区勘探的潜在目标。
Study shows that the surface area of the ancient lake of the west slope at northern Songliao basin is largely exposed during the initial deposit period of Yaojia Formation,and a regional unconformity surface as the channel of westward migration for oil and gas is formed later.Therefore,it is significant to study the deposition system of upper part of Yaojia Formation and its controlling factors on the oil and gas exploration and development.According to the analysis on the distribution of heavy minerals and the percentage of sandstone in each small layer,it is revealed that the SⅡ＋Ⅲ sand groups deposition of Yaojia Formation in the west slope of northern Songliao basin is controlled by the two-way provenance of Qiqihar and Yingtai;after analyzing the controlling factors of paleo-topography layer,palaeogeomorphic and water energy environment,combining with the study on the core data of 49 wells and the drilling logging data of 202 wells in the study area,the fact can be clarified that seven major micro-facies types in the SⅡ＋Ⅲ sand groups deposition of Yaojia Formation in the west slope area are developed,which includes underwater distributary channel,under water interdistributary bay,distal bar,mouth bar,sand flat,mud flat and sand-mud mixed flat;and the sedimentary micro-facies plane distribution feature and their changing law of the SⅡ＋Ⅲ4,SⅡ＋Ⅲ3,SⅡ＋Ⅲ2 and SⅡ＋Ⅲ1 four small layers are summarized.After studying the micro-facies under control of the south and north two-way provenance,it is proven that the underwater distributary channel and mouth bar are the favorite reservoir sandstones,and the sand flat and sand-mud mixed flat micro-facies formed at the environment of water erosion are likely to be the potential targets for exploration in the latter part of lakes area.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2011年第3期647-656,共10页
Journal of Jilin University：Earth Science Edition
基金
国家"973"计划项目(2005CB422103)
关键词
姚家组
SⅡ+Ⅲ砂组
物源分析
沉积微相
松辽盆地北部西斜坡
油气
Yaojia Formation
the SⅡ＋Ⅲ sand groups
provenance analysis
sedimentary micro-facies
the west slope of northern Songliao basin
petroleum gas
