泥砂速度比对小断层分辨率影响特征分析
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摘要
准噶尔盆地西北缘车排子地区中浅层受拉张应力作用,多发育小断距断层,与油气运移和聚集有着密切联系。小断距断层地震识别主要受断层上、下盘的反射时间差影响,而时间差又取决于地层速度。不同速度比条件下,小断距断层分辨率反映了岩性特征对分辨率的影响。根据分析不同泥砂速度比、不同子波主频以及不同噪音背景下的断层地震响应,得到泥岩与砂岩间速度比越低,断层分辨率越高。结合实际地震资料,将理论模型得到的结论用于车排子地区小断距断层的识别,取得了良好的应用效果。
The faults with minor throw developed in the northwest margin of Junggar basin are controlled by the tensile stress accumulated in the mid- shallow formations.Those faults play an important role in hydrocarbon migration and accumulation.Identifying a fault on the seismic section is determined by whether we have enough travel time separation for the hanging and foot wall of fault.The travel time is further influenced by velocity of formation.This paper provides an insight analysis for the influence of velocity ratio of mudstone to sand(VRMD)on identifying faults.We first discuss the effect of different value of VRMD,dominant frequency,and noise-signal ratio on identifying fault.The conclusion is that the lower value of VRMD,the easier identifying faults.We then apply our conclusion on identify the faults with minor throw on the seismic survey acquired over Chepaizi,Junggar bain.
引文
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