西湖凹陷平湖组砂泥岩岩性神经网络地震预测

doi:10.11720/wtyht.2021.1297

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Abstract

The traditional seismic P-wave impedance inversion method has the problems of low lithologic resolution and multi-solution,and it is hence difficult for the inversion results to meet the requirements of finely characterizing the lithologic distribution.In this paper,by constructing a normalized pseudo-gamma curve containing lithology and P-wave impedance information as a lithology index indicator curve,the neural network method is used to convert seismic data into a gamma data volume which is more closely related to lithology.Through the neural network seismic inversion,the sand and mudstone lithologic inversion data volume is obtained.This method was used to invert the sand and mudstone lithology of the Pinghu Formation in the Xihu Sag.Compared with traditional methods,the prediction accuracy of the mudstone thickness is up to 93%,which more accurately characterizes the distribution of underground sand and mudstone,and provides a basis for later oil and gas exploration.

Key words： pseudo-gamma curve neural network seismic inversion lithology prediction

Received: 18 June 2020 Published: 20 August 2021

ZTFLH:

P631

Corresponding Authors: ZHANG Shi-Hui E-mail: symdwjz@foxmail.com;zsh2008@cug.edu.cn

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	Peng-Fei ZHANG
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Cite this article:

Peng-Fei ZHANG,Shi-Hui ZHANG. Neural network seismic prediction of sand and mudstone lithology of Pinghu Formation in Xihu Sag[J]. Geophysical and Geochemical Exploration, 2021, 45(4): 1014-1020.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1297 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I4/1014

Sketch of poststack seismic neural network inversion constrained by well logs

The cross plot of all kinds lithology of Gamma ray and P-velocity

Comparison result of gamma and relative gamma for two wells

Comparation of gamma(a),relative gamma(b) and P-impedance cross plot

Pseudo-wave impedance curve and lithology probability intersection diagram

Schematic diagram of neural network algorithm

Comparison of neural network seismic inversion results and actual P-wave impedance curve

Comparison of lithology and inversion results of well B2

Section of source rocks of well B1 in the Pinghu Formation(yellow part is high-quality source rock (TOC abundance>1) section)

Thickness slice of mudstone in Pinghu Formation in Xihu Sag
a—thickness slice of mudstone in upper Pinghu Formation;b—thickness slice of mudstone in middle Pinghu Formation;c—thickness slice of mudstone in lower Pinghu Formation

Comparison between inverted mudstone thickness and measured mudstone thickness

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