petrel 时深转换.ppt

1、Domain conversion,Domain conversion,Move data from time to depth or reserve, also move data between two versions of the same domain. Data is shifted in the vertical direction only. Processes: make velocity model depth conversion,Domain conversion background,Calculated from datum, progressing downwar

2、ds and taking one zone at a time. When reverse faults, the zone above the faults(上盘) are converted first.,Make velocity model process,时间到深度域,选择datum,Make velocity model process,定义层段底面 可以用三种格式定义： Constant：常值 Surface:输入面 Horizon：3dgrid,定义层段内的速度类型：V=Vint层内速度是常数。 V=V0+kZ:初始速度+速度变量 Seismic velocity cubes

3、:从datum到目的层是有一个速度体。 3d grid property:包含平均速度的网格体，对复杂地形有用，如逆断层。 Same as above:用于薄层，或有井T-D表时,定义层段内输入的数据： Constant:速度是常数。 surface: 速度面 Well TDR constant:使用时深表，井间常数 Well TDR surface :井时深表，井间求曲面 Correction constant:用校正值，其他地方用常数 Correction surface:用校正值，其他地方沿层内插,定义层段内速度的校正值： None:无。 Well tops: 井分层（最常用） cons

4、tant:常数 surface :速度面 Horizon :grid数据,Make velocity model process,输出设置： Seismic cube:层速度，for QC Velocity surface:层段的顶面速度V0 Well data:用TDR时可用 Time and velocity logs:输出井的时间和速度曲线。 Residual points at well tops:时深转换后井点Z值与top的残差。 Well report：井点相应层的深度。 Replace dip and azimuth on well tops:小层倾角方位角随速度面调整,Make

5、 velocity model process,输出的一些高级设置： Well velocity: 使用井时深表和井校正时需要的设置。 None: 不用井校正 Use radius:不选的话全区校正 Use zone logs:校正转换后井轨迹和层位，防止井的错误穿层。 Depth tolerance:作为层段计算的最小厚度。 Depth tolerance：作为层段计算的最小时间厚度 Clip v0:v0的最大最小值， Clip k : k 的最大最小值 Ignore values outside limits:忽略超出v0和k范围的值,Make velocity model process

6、,Gridding: 计算面的算法 Resolution： 设置输出网格(体，面，曲线),Identifying and removing poor quality well tops,Create the velocity model using well correction and output the residuals onto the well tops. Display the relevant well tops in 3D windows and choose Any as the depth scale. Open the well tops spreadsheet. Ch

7、eck on the desired attribute to test(residual or velocity)to display the values. Right click on the attribute and choose use as Z position. Unusually high or low values will now be obvious(change the vertical scale to accentuate differences). The velocity surface from the velocity model can also be

8、displayed to see the effect of extreme values. Select the make/edit well tops process and select the extreme well tops in the 3D window, the same well top will be selected in the well top table. Uncheck the used by depth conversion option for the extreme well tops. Rerun the make velocity model. 选择需

9、要的层位和分层（用分层做约束）建立速度模型，输出设置打开井数据和残差窗口 在well top的spreadsheet中钩掉异常值，使它们不参与速度模型和地质模型的运算 重新进行运行速度模型。,Preparing well velocity data,Raw data QC: Interval velocity Create an interval velocity attribute on the check-shots. Display the interval velocity attribute in well section windows. Delete bad values in spreadsheet. 在checkshot里建立一个层速度的属性，把层速度值复制到里面。 在well section window里显示井的层速度，如果有异常值，在spreadsheet里去除。 Look for relationship in the velocity data Create an interv