构造反转期层序划分和可容纳空间的变化机制——以松辽盆地北部晚白垩世构造反转期为例  

Sequence Classification and Accommodation Change Mechanism in Structure Reverse Period : An Example from Late Cretaceous Structure Reverse Period of Northern Songliao Basin

作　　者：李树青[1] 王英民[1] 王岩[1] 张顺[2] 赵波[2] 

机构地区：[1]中国石油大学资源与信息学院,北京102249 [2]中国石油天然气股份有限公司大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《地质科技情报》2007年第3期1-6,共6页Geological Science and Technology Information

基　　金：国家自然科学基金项目(40272057)

摘　　要：按照盆地构造演化级别,依据不整合面和地层叠加方式的旋回变化,同时结合地震、测井等基础资料,建立了松辽盆地北部上白垩统四方台组和明水组的层序地层格架,将四方台组和明水组划分为1个二级层序、3个三级层序、6个四级层序。根据松辽盆地的构造演化特征,讨论了构造反转背景下可容纳空间的变化机制和特征,认为在构造反转背景下影响可容纳空间的主要因素有以下3种:①受挤压所导致的扭曲变形引起盆地基底局部的下沉和缓慢的沉降;②沉积物的重力差异压实导致盆地均衡失调引起基底的差异沉降;③挤压作用引起沉积物供应效率的变化。A sequence stratigraphy framework of Upper Cretaceous Sifangtai and Mingshui Formations in northern Songliao Basin is established according to basin structure evolution, cycle change of uncomformity and strata superimposition combined with seismic data and logging. It can be divided into one second order sequence, three tri-order sequences and six quadric-order sequences. The analysis of the accommodation change mechanism and features in a reversed structure based on its evolution characteristics in the basin reveals that it is mainly influenced by local dipping and slow falling of the basin basement caused by compression deformation, and that the differentiae gravity compaction of the sediments leads to the unbalance of the basin, which in turn, causes the difference settling of the basement. At the same time, sediment supply efficiency is affected by the compression.

关 键 词：层序格架 可容纳空间 构造反转 变化机制 

分 类 号：TE121.2[石油与天然气工程—油气勘探]