柴达木盆地南翼山构造三维地震资料解释及地质成果

南翼山构造三维地震资料解释是按下述步骤进行的:①首先根据已有钻井分层数据和各种测井曲线进行层位标定;②然后利用Apollo工作站的SEISTAR解释软件包具有垂直剖面和时间切片相关联的功能。进行层位拾取,生成时间构造图;③对工区内已有声测曲线进行各种校正建立三维速度数据体;④然后利用三维速度数据体与等t_0图得到解释层位的平均速度图;⑤利用Apollo的MAPSTAR绘图软件包的相应模块,把时间构造图和平均速度图的两个数据文件进行相应的运算,即可得到深度构造图。综合钻井和地震的各种信息分析认为,低频、低速、强能量是南翼山构造高产油气层的主要特征。据此,落实了渐新统顶高产油气层和中部上新统内一油层的分布范围。

Interpretation of three-dimensional seismic data in Nanyishan structure area in Chaidamu basin, and the geological result,

The interpretation of three-dimensional seismic data in Nanyishan structure area was finished in the following steps: 1. Seismic horizons are correlated with geological horizons by analysing drilling data and various logging curves. 2. Seismic horizon picking and time structure map were achieved by using Apollo workstation's SEISTAR interpretation software package which can correlate vertical section with time slice. 3. Three-dimensional velocity data volume was made by performing various corrections of available sonic logging curves in the area. 4. Average velocity map for seismic horizon interpretation was plotted by using the three-dimensional velocity data volume and time structure map. 5. Depth structure map was drawn by making necessary mathematical operation of data files about time structure map and average velocity map with the use of corresponding module of Apollo workstation's MAPSTAR software package. The comprehensive analysis of drilling and seismic informations shows that the rich hydrocarbon seismic horizons in the Nanyishan structure are mainly characterized by low frequency, low velocity and high energy. So, the distributions of rich hydrocarbon reservoirs in top Oligocene (E_3) and mid pliocene (N_2) series were ascertained by using the seismic characteristics.