SEG

可以快速读取出SEG-Y格式的地震数据的详细信息，例如道头，采样点数，线数，道数等，方便快捷。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace SegyRead
{
    public class SegYReader
    {
        private SegyVolumeHeader volumeHeaderStruct;
        public List traceData;
        private string fileNamePath;

        public SegYReader（string fileNamePath）
        {

            this.fileNamePath = fileNamePath;
            this.traceData = new List（）;

        }
        //读取卷头信息
        private void ReadVolumeHeader（Stream stream）
        {
            byte[] temp = new byte[18];
            stream.Seek（12 SeekOrigin.Current）;
            stream.Read（temp 0 18）;
            Tools.SwapNybbleByteOrder（ref temp 0 9）;
            volumeHeaderStruct = （SegyVolumeHeader）Tools.BytesToStruct（temp volumeHeaderStruct.GetType（））;
        }

        public void Read（）
        {
            Stream stream = null;
            FileStream fileStream = null;

            if （!File.Exists（fileNamePath））
            {
                throw new Exception（“文件不存在“）;
            }
            else
            {
                 fileStream = new FileStream（fileNamePath FileMode.Open）;
            }
            if （fileStream.Length < 3600）
            {
                fileStream.Dispose（）;
                throw new Exception（“文件格式不正确“）;
            }
            else
            {
                stream = new MemoryStream（）;
                fileStream.CopyTo（stream）;
                fileStream.Dispose（）;

                stream.Seek（3200 SeekOrigin.Begin）;
                this.ReadVolumeHeader（stream）;
                switch （volumeHeaderStruct.data_sample_format_code）
                {
                    case 1:
                        ReadSampleDataOfIBM（stream）;
                        break;//采样数据格式为IBM4字节浮点型
                    case 5:
                        ReadSampleDataOfIEEE（stream）;
                        break;//采样数据位4字节IEEE浮点数
                }

                stream.Dispose（）;
            }
                

        }

        private void ReadSampleDataOfIBM（Stream stream）
        {
            byte[] tempWord = new byte[4];
            byte[] tempNybble = new byte[2];
            int traceIndex;
            int sampleNum;
            int sampleInterval;
            float[] sampleData;

            stream.Seek（3600 SeekOrigin.Begin）;
            while （stream.Position < stream.Length）
            {
                //读取道号
                stream.Read（tempWord 0 4）;                
                Tools.SwapWordByteOrder（ref tempWord 0 1）;
                traceIndex = BitConverter.ToInt32（tempWord 0）;
                //读取道采样点数
                stream.Seek（110 SeekOrigin.Current）;
                stream.Read（tempNybble 0 2）;
                Tools.SwapNybbleByteOrder（ref tempNybble 0 1）;
                sampleNum = BitConverter.ToInt16（tempNybble 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件       9216  2014-06-03 17:54  SegReader\SegReader\bin\Debug\SegReader.dll

     文件      26112  2014-06-03 17:54  SegReader\SegReader\bin\Debug\SegReader.pdb

     文件       5605  2014-06-03 17:54  SegReader\SegReader\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件        674  2014-04-12 09:43  SegReader\SegReader\obj\Debug\SegReader.csproj.FileListAbsolute.txt

     文件       9216  2014-06-03 17:54  SegReader\SegReader\obj\Debug\SegReader.dll

     文件      26112  2014-06-03 17:54  SegReader\SegReader\obj\Debug\SegReader.pdb

     文件       1370  2012-03-14 15:15  SegReader\SegReader\Properties\AssemblyInfo.cs

     文件       2483  2012-05-03 09:42  SegReader\SegReader\SegReader.csproj

     文件       4014  2012-05-03 09:38  SegReader\SegReader\SegYReader.cs

     文件       1200  2012-03-14 15:16  SegReader\SegReader\SegyTraceData.cs

     文件       7748  2012-03-14 15:16  SegReader\SegReader\SegyTraceHeader.cs

     文件       3596  2012-03-14 15:16  SegReader\SegReader\SegyVolumeHeader.cs

     文件       5348  2012-05-03 09:21  SegReader\SegReader\Tools.cs

     文件        917  2012-03-14 15:15  SegReader\SegReader.sln

    ..A..H.     27136  2014-06-03 17:55  SegReader\SegReader.suo

     目录          0  2012-08-08 14:49  SegReader\SegReader\obj\Debug\TempPE

     目录          0  2012-08-17 16:00  SegReader\SegReader\bin\Debug

     目录          0  2012-08-08 14:49  SegReader\SegReader\bin\Release

     目录          0  2014-06-03 17:54  SegReader\SegReader\obj\Debug

     目录          0  2012-08-17 16:00  SegReader\SegReader\bin

     目录          0  2012-08-17 16:00  SegReader\SegReader\obj

     目录          0  2012-08-17 16:00  SegReader\SegReader\Properties

     目录          0  2012-08-17 16:00  SegReader\SegReader

     目录          0  2012-08-17 16:00  SegReader

----------- ---------  ---------- -----  ----

               130747                    24