时频属性法薄互层预测

doi:10.13810/j.cnki.issn.1000-7210.2017.06.017

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石油地球物理勘探 ›› 2017, Vol. 52 ›› Issue (6) : 1261-1268. DOI: 10.13810/j.cnki.issn.1000-7210.2017.06.017

综合研究

时频属性法薄互层预测

刘力辉¹, 李建海², 孙莹频¹, 胡诚²

作者信息 +

Thin inter-bed prediction with time and frequency attributes

Liu Lihui¹, Li Jianhai², Sun Yinpin¹, Hu Cheng²

Author information +

文章历史 +

摘要

1/4波长以内的薄互层厚度预测一直是勘探难题，本文主要探讨利用时频属性预测薄互层累计厚度的方法。通过薄互层楔状模型和两个叠置薄层模型，厘清薄互层累计厚度与时频属性的关系及其主要影响因素。模型研究结果表明：净毛比、层数和互层模式都对峰值振幅-毛厚度关系有影响，其中净毛比影响最大，其次是互层数，影响最小的是互层模式；净毛比控制峰值振幅、峰值频率与毛厚度关系，也控制调谐厚度范围；在调谐厚度内，峰值振幅（积分能谱）与毛厚度呈单调递增线性关系，峰值频率与毛厚度呈单调递减线性关系；积分能谱与净厚度呈线性关系，积分能谱有扩大调谐厚度范围功能，有利于计算薄互层净厚度。根据模型试算结果，在实际资料中运用人工智能方法，利用峰值振幅和峰值频率等联合计算薄互层净厚度。预测结果表明本文方法准确、可靠，实用性强。

Abstract

It is very difficult to predict thin inter-beds with its thickness of the 1/4 wavelength.This paper mainly discusses a method for predicting the cumulative thickness of thin inter-beds with time and frequency attributes.Based on a thin inter-bed wedge model and two stacked thin inter-bed models,the relationships between cumulative thickness and time-frequency attributes of thin inter-bed and the main factors that influence the relationship are determined.The following understandings are obtained based on the model tests:①The net-to-gross ratio,the number of thin beds,and the inter-bed mode affect the relationship between the peak amplitude and the gross thickness,the net-to-gross ratio has the largest influence,then the number of thin beds,and the inter-bed mode; ②The net-to-gross ratio controls the relationship between the peak amplitude (integral energy spectrum) and the gross thickness and the relationship between the peak frequency and the gross thickness,it also controls tuning thickness range; ③In the tuning thickness,the relationship between the peak amplitude and the gross thickness shows a single increasing linearity,and the relationship between the peak frequency and the gross thickness shows a single decreasing linearity; ④The integral energy spectrum and the net thickness are linear,and the integral limit can expand the tuning thickness range,which is beneficial to calculate the thin bed net thickness.In practice,we calculate a thin bed net thickness with the artificial intelligence based on the peak amplitude and peak frequency,and the results show that the proposed method is reasonable and reliable.

导出引用

刘力辉, 李建海, 孙莹频, 胡诚. 时频属性法薄互层预测[J]. 石油地球物理勘探, 2017, 52(6): 1261-1268 https://doi.org/10.13810/j.cnki.issn.1000-7210.2017.06.017

Liu Lihui, Li Jianhai, Sun Yinpin, Hu Cheng. Thin inter-bed prediction with time and frequency attributes[J]. Oil Geophysical Prospecting, 2017, 52(6): 1261-1268 https://doi.org/10.13810/j.cnki.issn.1000-7210.2017.06.017

中图分类号： P631

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