用离散余弦变换（DCT）研究大庆探区外围DB1线重力场特征

用离散余弦变换（DCT）研究大庆探区外围DB1线重力场特征

张凤旭¹，孟令顺¹，王世煜¹，张凤琴²

1.吉林大学地球探测科学与技术学院，长春 1300262.吉林大学物理学院，长春 130012

收稿日期:2006-10-12 修回日期:1900-01-01 出版日期:2007-09-26 发布日期:2007-09-26
通讯作者: 张凤旭

Study on Characteristics of Gravity Field of Line DB1 in Periphery of Daqing Prospect Area by Discrete Cosine Transform

ZHANG Feng-xu¹, MENG Ling-shun¹, WANG Shi-yu¹, ZHANG Feng-qin²

1.College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;2.College of Physics, Jilin University, Changchun 130023, China

Received:2006-10-12 Revised:1900-01-01 Online:2007-09-26 Published:2007-09-26
Contact: ZHANG Feng-xu

摘要/Abstract

摘要： 基于DCT的重力异常数据处理正、反演方法具有较高的精度，计算方法稳定性优良。将基于DCT的重力异常水平一阶导数、垂向一阶导数、常密度单界面异常反演和Euler反褶积等正、反演方法用于大庆探区外围虎林盆地DB1线重力异常数据处理中，综合分析了该线重力场特征。利用基于DCT的Euler反褶积法反演出断层14条，分析了其中7条较深大断裂的性质。根据反演的结晶基底起伏情况和断裂构造剖面轨迹的基本特征，将DB1线划分为两隆两坳的构造格局，其中七虎林河断陷是由古新纪（E）断陷与早白垩纪（K₁）残余盆地组成的2个旋回（E+ K₁）的叠合盆地，而凯北坳陷为早白垩纪（K₁）的残余盆地。把敦密南北支2条断裂确定为虎林盆地控盆断裂，阐述了控盆断裂的动力学特征。

关键词: DCT, 重力场特征, 结晶基底, 断裂构造, 控盆断裂

Abstract: Discrete cosine transform (DCT) is of relatively high accurate and numerical stability in the processing of gravity anomalies. The horizontal and vertical derivatives of the first order, the constant density single interface inversion, and Euler deconvolution technique based on the DCT method, are applied to process the gravity data of Line DB1 in periphery of Daqing prospect area. Euler deconvolution based on DCT reveals 14 faults, and the properties of the 7 deeper faults of them are analyzed. According to the inversed depth of crystalline basement and the characteristics of fault tracks, the profile is partitioned into a structural framework of 2 uplifts and 2 depressions, in which Qihulinhe depression is a superimposition basin of the depression in Paleocene(E) and the relic basin of the early Cretaceous period(K¹), while Kaibei depression seems to be a relic basin of K¹. After the comprehensive analysis of the characteristics of the investigation results, it is confirmed that the south and north part of Dun-Mi fault are the basin controlling faults.

Key words: DCT, characteristic of gravity field, crystalline basement, faulted structure, fracture of control basin

中图分类号:

P631.1

张凤旭，孟令顺，王世煜，张凤琴. 用离散余弦变换（DCT）研究大庆探区外围DB1线重力场特征[J]. J4, 2007, 37(5): 1009-1015.

ZHANG Feng-xu, MENG Ling-shun, WANG Shi-yu, ZHANG Feng-qin. Study on Characteristics of Gravity Field of Line DB1 in Periphery of Daqing Prospect Area by Discrete Cosine Transform[J]. J4, 2007, 37(5): 1009-1015.

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