盆地伸展系数求取方法与评价—以苏北盆地为例

包汉勇; 郭战峰; 张罗磊; 黄亚平

doi:10.11781/sysydz201303331

盆地伸展系数求取方法与评价—以苏北盆地为例

doi: 10.11781/sysydz201303331

1.
中国石油化工股份有限公司江汉油田分公司勘探开发研究院, 武汉 430223
2. 同济大学海洋地质国家重点实验室, 上海 200092
3. 东京大学地震研究所, 日本东京 1130032
4. 中国矿业大学资源与地球科学学院, 江苏徐州 221116

基金项目: 国家自然科学基金项目(40621063);国家重大专项项目(2011ZX05005-003)资助

详细信息

作者简介:
包汉勇(1981- ),男,博士,工程师,从事石油地质和含油气盆地分析研究.E-mail:geobhy@yahoo.cn.

中图分类号: TE121.1
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出版历程
- 收稿日期: 2012-04-05
- 修回日期: 2013-03-08
- 刊出日期: 2013-05-28

Calculating methods and assessment of stretching factor：A case study of Northern Jiangsu Basin

1.
Exploration and Development Research Institute of SINOPEC Jianghan Oilfield Company, Wuhan, Hubei 430223, China
2. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
3. Earthquake Research Institute, University of Tokyo, Tokyo 1130032, Japan
4. School of Resource and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

摘要

摘要: 伸展系数是张性盆地运动学分析的关键参数之一,对其计算可采用定义法、平衡剖面法和构造热演化模拟法.该文介绍了用这3种方法求取伸展系数的原理,并对苏北盆地晚白垩世伸展拉张以来的伸展系数进行了计算,综合分析后认为:定义法在获取了区域地壳厚度的基础上便能勾画出平面上的伸展系数分布图,便于区域比较,但对多期拉张的盆地而言,难以准确计算各期次具体的伸展系数;平衡剖面法能够恢复多期拉张的伸展系数,但因其自身难以做到真正的平衡,且没有考虑到地壳下部的热沉降,因而计算结果常需辅以其他手段加以对比分析;构造热演化模拟法在研究盆地构造形变的同时,综合考虑了深部构造热沉降,并且能读取不同时期任一点的地壳厚度,因而较定义法和平衡剖面法更为精确和方便.
- 伸展盆地 /
- 伸展系数 /
- 定义法 /
- 平衡剖面 /
- 构造热模拟 /
- 苏北盆地
Abstract: Basin stretching factor is a key parameter of extensional basin study and it was normally calculated from definition,balanced cross-section and tectonic-thermal modeling.The principles of traditional methods were briefly introduced in this paper,and the stretching factor of extension rifting in the Northern Jiangsu Basin after the late Cretaceous was also calculated.Basin stretching factor can be acquired by definition based on crust thickness,and it can be easily compared in different regions.For multi-phases stretch basin,it is hard to determine the stretching factor in different phases.The balanced cross-section method can reconstruct the basin stretching factor of multi-phases stretch,but the real equilibrium is actually hard to reach while the tectonic-thermal subsidence of the lower crust is not taken into consideration,thus other methods are needed for better comparison.The tectonic-thermal modeling method considers tectonic-thermal subsidence,and can also read curst thickness in any period.As a result,the tectonic-thermal modeling method is regarded as the more precise and convenient approach to calculate basin stretching factor.
- extensional basin /
- stretching factor /
- definition /
- balanced cross-section /
- tectonic-thermal modeling /
- Northern Jiangsu Basin

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