阿尔及利亚416a—417区块构造精细成图方法

Fine mapping of geological structure in 416a-417 area of Algeria.

阿尔及利亚中北部416a—417区块的勘探程度较低,为了实现主要目标层的构造精细解释,在对区内二维地震资料进行品质分析的基础上,采用了有效的地震剖面极性判别和层位精细标定方法,在构造成图过程中尝试了常规的时深转换、误差相关分析、空间变速等成图方法。实际应用表明,普通的常速成图方法只展现了研究区的大致构造形态,精度较低,地质规律和复杂构造形态表征不准;在缺少区域速度场资料的情况下,使用误差相关分析方法能较好地展示区域构造特征和圈闭形态;变速成图方法可以精细的展示构造带、圈闭面积及构造幅度,保证了构造成图的精度及准确性。

The 416a-417 area locates in the central north of Algeria with a low prospecting degree.On the basis of 2-D data quality analysis, effective seismic section polarity discrimination and fine stratum calibration method were adopted to realize detailed structure inter- pretation.In the process of mapping,several methods are utilized, which are conventional time-depth conversion,error correlation a- nalysis,and variable velocity mapping method.The actual applica- tion shows that the common constant velocity mapping method can only show the approximate structure shape of the area with a very low precision.In addition,it can't exactly characterize the geolog- ical rules and the complex structure forms.In the absence of re- gional velocity field,error correlation analysis can truly describe the areal structure characteristics and trap shape.The variable ve- locity mapping method can show geological structure belt,trap area and structure relief in detail.Therefore,it can ensure the precision and accuracy of structure mapping.