石化技术
石化技術
석화기술
Petrochemical Industry Technology
2015年
9期
68-69,67
,共3页
巨厚低降速带%地震采集技术%试验研究%组合激发%宽线大组合
巨厚低降速帶%地震採集技術%試驗研究%組閤激髮%寬線大組閤
거후저강속대%지진채집기술%시험연구%조합격발%관선대조합
very thick low deceleration zone%oilfield seismic acquisition%experimental research%combined stimulation%wide line and large array
松辽盆地高岗区普遍存在厚度超过100 m低降速带,由于存在4个自由界面,导致面波、多次波发育.其表层吸收衰减极为严重,地震资料属于极低信噪比地区.通过试验研究,巨厚低降速带采用多井组合激发,采用宽线大组合、高覆盖的观测系统,提高了资料品质.试验结果表明,在极低信噪比地区激发和接收工艺改善潜力有限,叠加次数与观测系统方式才是决定性因素.
鬆遼盆地高崗區普遍存在厚度超過100 m低降速帶,由于存在4箇自由界麵,導緻麵波、多次波髮育.其錶層吸收衰減極為嚴重,地震資料屬于極低信譟比地區.通過試驗研究,巨厚低降速帶採用多井組閤激髮,採用寬線大組閤、高覆蓋的觀測繫統,提高瞭資料品質.試驗結果錶明,在極低信譟比地區激髮和接收工藝改善潛力有限,疊加次數與觀測繫統方式纔是決定性因素.
송료분지고강구보편존재후도초과100 m저강속대,유우존재4개자유계면,도치면파、다차파발육.기표층흡수쇠감겁위엄중,지진자료속우겁저신조비지구.통과시험연구,거후저강속대채용다정조합격발,채용관선대조합、고복개적관측계통,제고료자료품질.시험결과표명,재겁저신조비지구격발화접수공예개선잠력유한,첩가차수여관측계통방식재시결정성인소.
There are low deceleration zones beyond 100m depth in Gaogang area,Songliao Basin,where four free phases exist to cause surface wave and multiple wave growing.Moreover,the seismic data belong to ultra-low signal-to-noise ratio zone thanks to wave attenuation by surface absorption.The researches show that multiple wells combined stimulation can be used for improving the data quality of the thick low deceleration zone by means of observation system with high fold,wide line and large array.The experiments also show that the superposition times and observation system are crucial in improving data quality in ultra-low S/N ratio zone other than the stimulation and acquisition technologies.
