东营凹陷胜坨地区沙三下亚段灰质泥岩分布特征研究

Study of Lime Mudstone′s Distribution Characteristics of the Lower Es_3 in Shengtuo Area of Dongying Depression

胜坨地区内发育有多个富灰质泥岩的地区,灰质泥岩的发育对砂体的描述造成了一定的影响。为了摸清东营凹陷胜坨地区沙三下亚段灰质泥岩的分布特征,结合前人研究,综合利用岩心、测井、地震、地球化学等资料,对研究区沙三下亚段进行了体系域的划分,划分为低位域、湖侵域和高位域。在各体系域的等时地层格架内进行了地层的精细划分与对比,以研究灰质泥岩的纵向和横向分布情况。高位域灰质泥岩分布特征为从北西向深湖区灰质泥岩厚度逐渐增厚。湖侵域灰质泥岩的分布情况为整体上东部地区比西部地区灰质泥岩厚,东部地区从北向南东方向逐渐减薄,西部地区从北西方向向南东-东逐渐增厚。低位域灰质泥岩的分布特征为从北西向深湖区灰质泥岩厚度逐渐增厚,最厚的位置分布于两个扇体之间地区。

A large number of lime mudstone has developed in Shengtuo Area,it has an impact on the description of sandstone distribution.In order to find out the distribution characteristics of the lime mudstoneof the Lower Es3in Shengtuo area of Dongying depression,combined with results of previous studies,core,logging,seismic,geochemical and other information are used multipurposely,studied the division of sequence of the Lower Es3.It has been divided into3system tracts,lowstand system tract,transgressive tract and highstand system tract.It studied the stratigraphic classification and correlation of the Lower ES3in the isochronous stratigraphic framework and the vertical and plane distribution of lime mudstone in every system tract.The lime mudstone distribution in highstand systems tract is that from the the northwest to the deep lake area the thickness of lime mudstone gradually increased.The lime mudstone distribution in transgressive systems tract is that the thickness of lime mudstone in eastern lime mudstone in western area on the whole,in the eastern area,from north to the southeast the thickness of lime mudstone gradually reduced,in the western area,from the northwest to the southeas-east,the thickness of lime mudstone gradually increased.The lime mudstone distribution in lowstand systems tract is that from the northwest to the deep lake area lime mudstoness thickness increased,between the two distributed fan body.