鄂尔多斯盆地三叠系延长鲤层序地层学研究  

Sequence Stratigraphical Studies of Triassic Yanchang Formation of Ordos Basin

作　　者：黄黎刚[1,2] 赵玉华[1,2] 朱军[1,2] 杜广宏[1] 蔡克汉[1,2] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院 [2]低渗透油气田勘探开发国家工程实验室

出　　处：《低渗透油气田》2012年第3期1-6,121,共7页

摘　　要：鄂尔多斯盆地是一个构造平缓的克拉通盆地，以岩性油气藏勘探为主。而以高分辨率的三维地震为主要研究手段的高分辨率层序地层学是岩性油气藏勘探的有效手段。但对于只有二维地震资料的鄂尔多斯盆地，如何利用现有地震资料成为层序地层学研究的关键。依据高分辨率层序地层学理论。将鄂尔多斯盆地三叠系延长组划分为一个二级层序、5个三级层序及14个四级层序。利用测井曲线频谱分析及地震资料时频分析识别三级及四级层序界面。通过井震联合标定，对延长组的层序进行系统划分，对其沉积旋回特征进行分析，总结其纵向及横向上的演化规律。Ordos basin is a craton basin with gentle structures. The main petroleum exploration is conducted in the lithological reser- voirs. The high resolution sequence stratigraphy, which takes high resolution 3D seismic exploration as its main measures of study, is the effective way of lithological reservoir exploration. For the Ordos basin, which only has 2D seismic data, how to use the available seismic data is the key to researches of sequence stratigraphy. According to the theory of high resolution sequence stratigraphy, the Triassic Yanchang Formation of Ordos basin can be divided into one second-order sequence, five third-order sequences, and four- teen fourth-order sequences. The interfaces of third-order and fourth-order sequences were identified by application of logging curves spectrum analysis and the time-frequencies analysis of seismic data. Through the combined calibration of the wells and seismic data, the stratigraphic sequences of Yanchang Formation are systematically divided, and the features of the sedimentary cycles are ana- lyzed. The vertically and horizontally evolutional laws are summarized.

关 键 词：鄂尔多斯盆地 延长组 层序地层学 时频分析 频谱分析 

分 类 号：TE121[石油与天然气工程—油气勘探]