摘要
在岩心观察和粒度分析的基础上,结合录井、测井、地震等资料,对二连盆地巴音都兰凹陷B51井区下白垩统阿四段扇三角洲前缘沉积特征、分布规律与发育模式进行了研究。研究结果表明:(1)巴音都兰凹陷B51井区阿四段发育砂砾岩相、砂岩相、粉砂岩相、泥岩相等四大类,可进一步划分为13个小类,粒度概率累计曲线表现为悬浮一段式、低斜两段式、高斜两段式、滚动-跳跃-悬浮三段式4种类型,具有箱形、钟形、漏斗形、指形、平直形5种测井相标志,发育前积、丘状、杂乱状、亚平行状4种地震相。(2)研究区阿四段扇三角洲前缘发育水下分流主河道、水下分流河道、河口坝、水下分流间湾、席状砂和远砂坝6种沉积微相,纵向上可分为Ⅰ,Ⅱ,Ⅲ共3个砂组,Ⅱ砂组和Ⅲ砂组沉积时期,扇三角洲前缘砂体分布广泛,水下分流主河道和水下分流河道发育;Ⅰ砂组沉积时期,湖盆范围最大,砂体变细、变薄。(3)研究区阿四段自下而上表现为水进沉积序列,发育退积型扇三角洲前缘,预测B51-71井区和B51-74井区发育的水下分流主河道和水下分流河道为利储集相带,B51-19井区发育的河口坝为较有利的储集相带。
Based on core observation and particle size analysis,combined with mud-logging,wire-logging and seismic data,the sedimentary characteristics,distribution law and development model of fan delta front of the fourth member of Cretaceous A’ershan Formation(K1a4)in B51 well area of Bayindulan Sag in Erlian Basin were studied.The results show that:(1)The lithofacies of K1a4 in B51 well area can be divided into 13 types in four major categories:conglomerate,sandstone,siltstone and mudstone.The grain size distribution curves can be classified into four types,including one suspension segment pattern,low slope two segment pattern,high slope two segment pattern and one roll segment-one bouncing segment-one suspension segment pattern.The log‐ging curves has the characteristics of box-shaped,bell-shaped,funnel-shaped,finger-shaped and flat-shaped,and there are four types of seismic facies:foreset,lenticular,moundy and subparallel.(2)There are six types of sedimentary microfacies in the fan delta front,including underwater channel,underwater distributary chan‐nel,mouth bar,underwater distributary interchannel,sheet sand and distal bar.The K1a4 can be divided intoⅠ,Ⅱ,Ⅲsand groups in vertical.During the sedimentary period ofⅡandⅢsand groups,the sand bodies of fan delta front were widely distributed,underwater channel and underwater distributary channel were mainly deve-loped.During the sedimentary period ofⅠsand groups,lacustrine basin occupied the largest area,sand bodies became finer and thinner.(3)The K1a4 in the study area shows water intrusion depositional sequence from bot‐tom to top,with the development of a retrogradational fan delta front.It is predicted that the underwater channel and underwater distributary channel developed in B51-71 and B51-74 well areas are favorable reservoir facies zones,while mouth bar developed in B51-19 well area is a more favorable reservoir facies zone.
作者
周洪锋
吴海红
杨禹希
向红英
高吉宏
贺昊文
赵旭
ZHOU Hongfeng;WU Haihong;YANG Yuxi;XIANG Hongying;GAO Jihong;HE Haowen;ZHAO Xu(Erlian Branch,PetroChina Huabei Oilfield Company,Xilinhaote 027200,Inner Mongolia,China;Zhike Petroleum Technology Co.,Ltd.,Renqiu 062552,Hebei,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2024年第4期85-97,共13页
Lithologic Reservoirs
基金
中国石油重大科技专项“华北油田持续有效稳产勘探开发关键技术研究与应用”(编号:2017E-15)资助。
关键词
扇三角洲前缘
沉积特征
水进-退积旋回
粒度概率累计曲线
测井相标志
地震相
水下分流河道
河口坝
阿四段
白垩系
巴音都兰凹陷
二连盆地
fan delta front
sedimentary characteristics
transgressive-regressive cycle
grain size cumulative probability curve
logging facies markers
seismic facies
underwater distributary channel
mouth bar
the fourth member of A’ershan Formation
Cretaceous
Bayindulan Sag
Erlian Basin
