宽线观测大组合接收技术在阜康断裂带的应用

Application of wide-line array receiving technique in Fukang Fault Zone

阜康断裂带是准噶尔盆地油气勘探的有利区带。该区带地表起伏剧烈,地层倾角大,表层破碎,激发和接收条件差;面波、折射波发育,次生线性干扰强;断层发育,地腹构造复杂;地层反射波组连续性及其成像效果差,三叠系及以下地震资料品质普遍很差,二叠系特别是石炭系反射的信噪比很低,难以准确成像。针对工区特点,采用宽线采集方法大幅度提高有效叠加次数和增强抗干扰能力,提高构造主体成像效果;利用检波器大组合压制多种干扰,提高单炮信噪比。应用效果表明,该采集方法能够提高深层反射资料的信噪比和主体构造部位的成像效果。

The Fukang Fault Zone is favorable to oil and gas accumulation in Zhunger Basin.Rugged topography and steep dip angle of formations result in adverse shooting and receiving conditions.Surface waves and refraction waves bring about strong secondary linear interference.Well-developed faults result in poor continuity of reflection events.The quality of seismic data is poor below the Triassic,and the Permian reflections are of low S/N,the Carboniferous is even worse.Wide-line acquisition method was adopted to enhance the coverage and diminish interferences.Large array was used to suppress noises.Desired results have been achieved by using the proposed methods.