python地震数据可视化详解

2021-04-03 我要评论

参考源码：seisplot

准备工作：

在windows10下安装python3.7，下载参考源码到本地。

1. demo绘图测试

demo绘图指令

cmd> python seisplot.py --demo

问题1）缺少依赖包

 File "D:/Desktop/python可视化/seisplot/seisplot.py", line 16, in <module>
 import yaml
ModuleNotFoundError: No module named 'yaml'
 
>pip3 install yaml
 Could not find a version that satisfies the requirement yaml (from versions: )
No matching distribution found for yaml

查看environment.yml:

channels:
- defaults
- conda-forge
dependencies:
- matplotlib
- numpy
- obspy
- pillow
- pyyaml

安装相关依赖包，如 obspy pillow pyyaml

cmd> pip3 install obspy

出现proxy error，添加选项 --proxy server:port

安装ok

问题2）配置文件的编码异常

D:\Desktop\python可视化\seisplot>python seisplot.py --demo
[91m
 Welcome to
 ┌─┐┌─┐┬┌─┐┌─┐┬ ┌─┐┌┬┐
 └─┐├┤ │└─┐├─┘│ │ │ │
 └─┘└─┘┴└─┘┴ ┴─┘└─┘ ┴
    Good luck[0m
Traceback (most recent call last):
 File "seisplot.py", line 421, in <module>
 cfg = yaml.load(f)
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\__init__.py", line 70, in load
 loader = Loader(stream)
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\loader.py", line 34, in __init__
 Reader.__init__(self, stream)
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\reader.py", line 85, in __init__
 self.determine_encoding()
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\reader.py", line 124, in determine_encoding
 self.update_raw()
 File "D:\ProgramFiles\Python36\lib\site-packages\yaml\reader.py", line 178, in update_raw
 data = self.stream.read(size)
UnicodeDecodeError: 'gbk' codec can't decode byte 0x99 in position 2003: illegal multibyte sequence

分析源码中参数传递情况：

def load(stream, Loader=Loader):
 """
 Parse the first YAML document in a stream
 and produce the corresponding Python object.
 """
 print(stream) ## debug by huanying03
 loader = Loader(stream)
 try:
  return loader.get_single_data()
 finally:
  loader.dispose()

打印结果如下：

<_io.TextIOWrapper name='config.yml' mode='r' encoding='cp936'>

编码不对？

65001 ：UTF-8代码页

936 ：默认的GBK

437 ：是美国英语

仔细检查发现config.yml中有异常字符，更正config.yml中错误字符：ok

问题3）python调试打印语句

print ("value=%d"%value)

demo数据绘图结果

如下：

2. 本地数据绘图测试

应用指令

cmd > python seisplot.py data/my.sgy

问题1）数据道的采样值异常

filename data2/t10.sgy
seismic.py:104:dt=4000
seismic.py:104:ns=512
seismic.py:144:header=b'C 1 CLIENT'
n_traces 500
n_samples 512
dt   0.004
t_start 0
t_end  2.044
max_val inf
min_val -inf
clip_val 180462501764003194804057887685476352
Read data in 0.4 s
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
PLOTTING
plot width 17.00 in
plot height 11.00 in
Traceback (most recent call last):
 File "seisplot.py", line 442, in <module>
 main(t, cfg)
 File "seisplot.py", line 214, in main
 cfg)
 File "D:\Desktop\python可视化\seisplot\plotter.py", line 123, in plot_histogram
 y, x, _ = ax.hist(np.ravel(data), bins=int(100.0 / (clip_val / largest)),
OverflowError: cannot convert float infinity to integer

解决办法：将数据做归一化处理

问题2）数据文件的卷头异常

filename data2/marmousi_vel.segy.hdrs.sgy.cdp.sgy
seismic.py:104:dt=10000
seismic.py:104:ns=350
seismic.py:144:header=b'\xc3@\xf1@\xc3\xd3\xc9\xc5\xd5\xe3'
Traceback (most recent call last):
 File "seisplot.py", line 442, in <module>
 main(t, cfg)
 File "seisplot.py", line 40, in main
 s = Seismic.from_segy(target, params={'ndim': cfg['ndim']})
 File "D:\Desktop\python可视化\seisplot\seismic.py", line 164, in from_segy
 return cls.from_obspy(stream, params=params)
 File "D:\Desktop\python可视化\seisplot\seismic.py", line 147, in from_obspy
 x =np.array(list(stream.textual_file_header.decode()))
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc3 in position 0: invalid continuation byte

解决办法：重写3200字节的segy卷头

marmousi相关数据绘图

速度模型绘图结果如下：