杨高印^1,,
王君恒^2,,,
闫后振³
1. 陕西省地球物理学会, 西安 710075
2. 中国地质大学(北京), 地球物理与信息技术学院, 北京 100083
3. 青岛地矿岩土工程有限公司, 青岛 266100


详细信息

作者简介: 杨高印, 男, 1961年生, 工学硕士, 高级工程师, 现为陕西省地球物理学会会员、理事, 主要从事石油勘探开发工作.E-mail:1016203440@qq.com

通讯作者: 王君恒, 男, 1962年生, 博士, 中国地质大学(北京)地球物理与信息技术学院副教授、研究员, 主要从事应用地球物理和理论地球物理研究.E-mail:w1128@cugb.edu.cn

中图分类号: P631

收稿日期:2017-07-18
修回日期:2018-10-30
上线日期:2019-01-05

Application of modeling inversion of Bouguer gravity anomalies to oil and gas exploration in the Erlian Basin

YANG GaoYin^1,,
WANG JunHeng^2,,,
YAN HouZhen³
1. Geophysical Society of Shaanxi Province, Xi'an 710075, China
2. Institute of Geophysics and Information Technology, China University of Geosciences(Beijing), Beijing 100083, China
3. Qingdao Geology and Geotechnical Engineering Co., Ltd, Qingdao 266100, China


More Information

Corresponding author: WANG JunHeng,E-mail:w1128@cugb.edu.cn

MSC: P631

--> Received Date: 18 July 2017
Revised Date: 30 October 2018
Available Online: 05 January 2019


摘要
摘要:二连盆地由众多小凹陷组成，伊和凹陷是其中之一.重力资料在盆地"探边摸底"、"定凹选带"等方面发挥着重要作用.本文基于布格重力异常资料，利用2.5D建模反演技术对其中横跨主洼槽的两条测线进行可视化建模及正演拟合.其中，初始模型的几何参数取自二维地震解释结果；物性参数中的纵向密度取自测井声波波速与密度的相关公式.正演拟合为建模反演技术的关键环节，密度横向变化，是在拟合过程中通过人机交互试错调整实现.通过正演拟合，揭示了主洼槽沉积层横向和纵向均存在较大的密度不均匀性，主洼槽有利于油气生成.与地震解释结果对比，二者在赛汉组-第四纪、腾格尔组深度相差不大，但凹陷底部拟合结果与地震解释结果有明显差异.通过钻井结果验证，正演拟合各沉积层深度与钻井揭示的各层深度结果一致，二维地震解释结果偏浅，其可能原因是时深转换选取的速度值偏小造成.
关键词: 二连盆地/
伊和凹陷主洼槽/
布格重力异常/
建模反演/
正演拟合

Abstract:The Erlian basin is composed of many small sags, of which the Yihe sag is one. Gravity information plays an important role in surveys in basins such as "exploring edges and bottoms" and "determining depressions and choosing belts". Based on Bouguer gravity anomaly data, the two lines crossing the main subsags are visually modeled and forward fitted by using the 2.5D modeling inversion techniques. In these procedures, the geometric parameters of the initial model are taken from the two-dimensional seismic interpretation results and the longitudinal density in physical parameters is derived from the correlation formula of the acoustic velocity and density of well logging data. Forward modeling is a key part of modeling inversion, and the lateral change of density is achieved through trial-and-error adjustment of human-computer interaction in the modeling process. The results of forward modeling show that there is a large density heterogeneity in lateral and longitudinal directions of the main subsags which are favorable for oil and gas generation. Compared with the results of seismic interpretation, the depth difference of them in the Saihan Formation-Quaternary and Tengger Formation is not obvious, but the results of the bottom fitting are different from those of the seismic interpretation. Drilling verification indicates that the depth of each sedimentary layer by forward modeling is consistent with that revealed by the drilling. However, the results of the two-dimensional seismic interpretation are relatively shallower, probably because the speed of early time-depth conversion is too small.
Key words:Erlian basin/
Main subsags of Yihe sag/
Bouguer gravity anomaly/
Modeling inversion/
Forward modeling



PDF全文下载地址:

http://www.geophy.cn/data/article/export-pdf?id=dqwlxb_14842