摘要
塔北隆起X区白垩系舒善河组基础地质研究总体较弱,为明确区内储集砂体的分布规律,指导岩性油气藏勘探,有必要深化沉积特征等基础地质研究。以层序地层学理论为基础,结合频谱属性趋势分析(INPEFA)和小波变换技术,建立了舒善河组层序地层格架,将其划分为3个三级层序(SQ1、SQ2、SQ3)。通过岩相特征、测井相和地震相特征综合分析,识别出白垩系舒善河组发育三角洲和湖泊2种沉积相类型。在顺物源方向SQ1时期发育三角洲平原到三角洲前缘亚相沉积;SQ2时期湖平面波动频繁,在南部发育三角洲平原亚相沉积,中部到北部三角洲前缘砂体在高速频繁的湖浪改造作用下形成滨浅湖砂坝沉积;SQ3时期湖平面下降,主要发育三角洲平原亚相沉积。研究区总体上沉积水体较浅,发育三角洲-湖泊沉积体系,随着湖平面先上升、后下降以及物源供给的逐渐减少,先退积后进积。砂体分布规律主要受到河道迁移以及湖平面升降的控制,砂体发育规模在纵向上先减小再增大,分流河道、水下分流河道等储集砂体主要发育在南部的舒一段、舒三段底部,为岩性油气藏勘探的有利目标。
The basic geological research of Cretaceous Shushanhe Formation in X area is generally weak.In order to clarify the distribution law of reservoir sand bodies in the area and guide the exploration of lithologic reservoirs,it is necessary to deepen the basic geological research such as sedimentary characteristics.Based on the theory of sequence stratigraphy,combined with spectral attribute trend analysis(INPEFA)and wavelet transform technology,the sequence stratigraphic framework of Shushanhe Formation in X area is established,which is divided into three third-order sequences(SQ1,SQ2,SQ3).Through the comprehensive analysis of lithofacies characteristics,logging facies and seismic facies characteristics,two sedimentary facies types of delta and lake are identified in Cretaceous Shushanhe Formation.During the SQ1 period along the source direction,delta plain to delta front subfacies were developed;during the SQ2 period,the lake level fluctuated frequently,and the delta plain subfacies were developed in the south.The delta front sand bodies in the central and northern delta fronts formed shore-shallow lake sand bar deposits under the action of high-speed and frequent lake wave transformation.During the SQ3 period,the lake level decreased and the delta plain subfacies were mainly developed.On the whole,the sedimentary water body in the study area is shallow,and the delta-lake sedimentary system is developed.With the lake level rising first,then falling and the gradual decrease of the source supply,the lake level rises first and then falls.The distribution of sand bodies is mainly controlled by channel migration and lake level fluctuation.The development scale of sand bodies decreases first and then increases in the longitudinal direction.The reservoir sand bodies such as distributary channels and underwater distributary channels are mainly developed at the bottom of the first and third members of Shushanhe Formation in the south,which is a favorable target for the exploration of lithologic reservoirs.
作者
胡忠贵
杨帅奇
蔡全升
邓庆杰
HU Zhonggui;YANG Shuaiqi;CAI Quansheng;DENG Qingjie(School of Geosciences,Yangtze University,Wuhan 430100,Hubei;Sedimentary Basin Research Center,Yangtze University,Wuhan 430100,Hubei)
出处
《长江大学学报(自然科学版)》
2025年第1期1-11,共11页
Journal of Yangtze University(Natural Science Edition)
基金
国家科技重大专项“重点海相层系沉积相研究”(2016ZX05007002)。
关键词
塔里木盆地
塔北隆起
白垩系舒善河组
沉积特征
分布规律
Tarim Basin
Tabei uplift
Cretaceous Shushanhe Formation
sedimentary characteristics
distribution law
