济阳坳陷馆陶组层序地层研究

Study on Sequence Stratigraphy of Guantao Formation in Jiyang Depression

摘要:

利用钻井、测井、露头和地震等资料采用沉积学、层序地层学、地震地质学等方法，研究济阳坳陷馆陶组沉积特征，并进行了层序地层划分，结果发现：济阳坳陷馆陶组地层主要发育河流相沉积，馆陶组下段存在以浅水湖泊为背景的辫状河三角洲沉积，馆陶组上段发育湖泊三角洲沉积以及曲流河浅水三角洲沉积，在此基础上，进行了层序界面识别与层序划分，可将馆陶组地层可划分出一个构造层序，2个三级层序，层序底界面都为I型层序界面，每个层序内又可划分出3个体系域，即低水位体系域、扩张体系域和高水位体系域。

Abstract:

By using drilling, logging, and seismic data, sedimentology, sequence stratigraphy methods, earthquake geology, sedimentary characteristics of Guantao formation in Jiyang depression have been studied, and the sequence stratigraphy has been divided. It is found that: Guantao formation in Jiyang Depression mainly developed fluvial facies sediments, braided river delta sediments with shallow lakes as the background existed in the lower section of Guantao formation, and lake delta sediments and shallow meandering river delta sediments developed in the upper section of Guantao foramtion. On these basis, sequence interface identification and sequence stratigraphy division have been carried out. Guantao formation can be divided into a tectonic sequence and two third-order sequences. Sequence end interfaces are type Ⅰ sequence boundary. Each sequence can be divided into three systems, that is low water level system, expansion system, and domain and HST.