Application study of improving the precision of the ant-tracking-based fracture prediction technique
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摘要: 四川盆地外YS1井区经历多期构造演化,发育的断裂具有多期次、多走向等特征,在已钻井过程中发生了严重的井漏。利用常规的地震解释方法,较难达到精细刻画断裂的要求,也难以捋清断裂期次和展布。针对研究区实际情况,引进蚂蚁追踪技术来进行裂缝预测,并通过降噪、增强连续性、突出断层边界、剔除假构造等手段提高裂缝预测的精度。首先对输入的地震数据体进行构造导向滤波和不连续探测等预处理,之后通过对比优选出蚂蚁追踪参数设置,最后进行产状控制下的蚂蚁追踪,得到一套高精度的蚂蚁追踪体。使用该数据体不但能辅助精细刻画断层展布,还为接下来的断裂期次发育分析和水平井位部署提供数据基础。Abstract: The YS1 area in Sichuan basin has undergone multiple stages of tectonic evolution.The faults are characterized by multiple stages and multiple strikes,and serious mud losses occurred in the drilled well.It is difficult to finely characterize fracture and analyze structural development when the conventional seismic interpretation method is used.In this study,according to the actual situation,ant tracking technology was used to predict fractures,whose accuracy was improved by noise reduction,continuity enhancement,fault boundaries height,and fake structures elimination.The process is as follows:firstly,the input seismic data volume is pre-processed by structure-oriented filtering and discontinuity detection,then the ant tracking parameter settings are optimized,and finally the ant tracking under the occurrence control is performed.The data can not only be used to assist fault interpretation but also provide a data basis for subsequent fault development analysis and horizontal well location deployment.
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