摘要
通过测井、录井等资料,在王场地区潜4^(3)油组识别了4种沉积亚相和8种沉积微相类型,并确定非沟道化浊积岩模式和沟道化浊积岩模式两种典型沉积特征。潜4^(3)油组沉积演化经历了3个阶段:潜4^(3)_(3)时期湖平面较低,主要砂体发育范围较广,砂体主要集中在研究区的中部、南部和西部,其中以潜4^(3)_(3)-4砂体和潜4^(3)_(3)-3砂体最为发育,整体以沟道化浊积岩相为典型特征;潜4_(2)^(3)时期湖平面上升,该时期基本以泥岩沉积为主,王场地区基本无砂体发育,为区域性泥质隔层;潜4_(1)^(3)时期湖平面下降,砂体再次发育,但程度弱于潜433时期,砂体主要集中在西部,以潜4_(1)^(3)-2砂体最为发育,整体以非沟道化浊积岩相为典型特征。通过对砂体结构解剖,认为王场地区砂体结构样式主要有切叠式、侧叠式和孤立式3种,切叠式和侧叠式砂体主要发育在沟道、沟道侧翼及扇核处;孤立式砂体往往多发育在漫溢相和滑塌体处。
Through logging and mud logging data,four sedimentary subfacies and eight sedimentary microfacies were identified in Qian4^(3)oil formation of Wangchang area,and two typical sedimentary characteristics of non-channelized turbidite model and channelized turbidite model were determined.The sedimentary evolution of Qian4^(3)formation has experienced 3 stages:during the Qian4^(3)_(3)period,the lake level was relatively low,and the main sand bodies developed in a wide range,the sand bodies were mainly concentrated in the middle,south and west of the study area,among which the Qian4^(3)_(3)-4 sand body and the Qian4^(3)_(3)-3 sand body were the most developed,and the channelized turbidite facies was the typical feature;during the Qian4_(2)^(3)period,the lake level rose,during this period,mudstone deposits were the mainstay,Wangchang area was basically free of sand bodies and was a regional muddy barrier;during the Qian4_(1)^(3)period,the lake level dropped and the sandbodies developed again,but the degree was weaker than that of the Qian433 period,the sandbodies were mainly concentrated in the west,and the Qian4_(1)^(3)-2 sandbodies were the most developed,with the non-channelized turbidite facies as the typical feature.Based on the analysis of sandbody structure,it was pointed that there are three main sandbody structure styles in Wangchang area,namely,cut stack type,side stack type and isolated type.Cut stack type and side stack type sandbodies are mainly developed in channel,channel flank and fan core;isolated type sandbodies are often developed in overflow facies and slump body.
作者
巩亦雪
徐吉丰
GONG Yi-xue;XU Ji-feng(Yangtze University,Wuhan 430000,China)
出处
《当代化工》
CAS
2021年第7期1584-1590,共7页
Contemporary Chemical Industry
基金
国家自然科学基金,湖盆萎缩期河湖交替沉积记录特点及沉积过程响应机制(项目编号:41672119)。
关键词
沉积相
浊积岩
砂体结构
潜江凹陷
Sedimentary facies
Turbidite
Sandbody structure
Qianjiang sag
