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

（1.中国石油大学地球资源与信息学院，山东东营257061；2.中国石油化工股份有限公司江苏油田分公司物探技术研究院，江苏南京210046）

College of Geo-resources and Information, China University of Petroleum (East China), Dongying 257061, China

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 interpretation. In the process of mapping, several methods are utilized, which are conventional time-depth conversion, error correlation analysis, and variable velocity mapping method. The actual application 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 geological rules and the complex structure forms. In the absence of regional velocity field, error correlation analysis can truly describe the areal structure characteristics and trap shape. The variable velocity 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.