下二门油田南部H2^3层序沉积体系类型分析及其演化特征

THE SEDIMENTARY SYSTEM TYPES ANALYSIS AND THE EVOLVEMENT CHARACTERS OF H23 SEQUENCE OF THE SOUTH OF XIAERMEN OIL FIELD ,BIYANG DEPRESSION

下二门油田位于南襄盆地泌阳凹陷东南边缘,H23层序是该区生油层段核桃园组二段的一个三级层序。据地震相特征、测井曲线形态、岩芯和露头精细描述、地球化学和有机岩石学特征,在研究区H23层序中共识别出3种主要的沉积体系:三角洲、扇三角洲和湖泊沉积体系。对H23层序不同位置的体系域单元所包含的沉积相类型进行识别,结合层序内部各体系域单元的砂岩等厚图所反映的空间展布特征,可分析研究区内部的沉积物的物源通道及主要的供给方向。综合不同时期的空间展布特征,可以进一步得到H23层序沉积体系的垂向演化特征,对该区油气的勘探与开发具有指导意义。

Xiaermen oil field is a structure trapped area in the Biyang depression of the Nanxiang basin.H_2~3 sequence is a third class sequence in the source rock of the Hetaoyuan formation in the researched area.Three kinds of sedimentary systems can be identified there:delta system,fan delta and lacustrine system through the analysis of the characters of seismic facies,the shape of the well log and the description of the exposure,etc.Then portraying and researching the map of the thickness of the sandstone in the area,we can found the resource channels.The maps of different phases integrated,the characters of the vertical evolvement of the sedimentary systems in the objective layer of the area can be educed.