| 青藏高原第一条超深反射地震剖面的数据采集及其处理方法 |
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| 引用本文：郭景如,蒋多元,唐文榜,赵文津.1996.青藏高原第一条超深反射地震剖面的数据采集及其处理方法[J].地球学报,17(2):202-213. |
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| 中文摘要:中美ＩＮＤＥＰＴＨ项目第一阶段先导性试验，提供了高分辨率、高信噪比和反射信息非常丰富的近垂直反射剖面。其中主喜马拉雅滑脱界面（ＭＨＴ）和深达７０—８０ｋｍ的Ｍｏｈｏ，清晰可见；Ｍｏｈｏ以下仍有反射信息。事实证明．采用井深５０ｍ、药量５０ｋｇ和５０ｓ超长记录长度３个技术措施后，近垂直反射技术可以取得深部反射信息。在工作中井深和激发岩性是影响记录质量的两个互相依赖的重要因素。资料分析表明．井深大于２５ｍ的单孔爆炸，其记录质量较好，而井深大于２５ｍ组合的炮记录，几乎接收不到深反射信息。钻井所采用的泥浆固井和装炸药后填井等技术措施，对提高记录质量有较大帮助。在地震数据处理工作中，针对激发岩性沿线变化剧烈，我们做了地表子波一致性处理和去噪处理，极大地提高了深反射叠加剖面的质量。 |
| 中文关键词:反射 地壳 井深 MohoMHT |
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| Data Acquisition of the First Super-Deep Seismic Profile in Qinghai Tibetan (Xizang) Plateau and the Method of its Processing |
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| Abstract:The pilot survey of the Sino-American project INDEPTH has provided a highresolution, high-signal-to-noise ratio, near-vertical incidence reflection profile with abundant reflection information, which along with others yields clearly the Main Himalayan Thrust (MHT) and Moho discontinuity at a depth of 70-80km. There still are observed reflections beneath the Moho discontinuity. It is demonstrated by facts, that the near-vertical reflection technique can receive reflections from a depth of 70-80km, with three technical measures, such as 50m deep shot holes, 50kg dynamite and 50s superlong recording time, taken. It is obvious, that both the depth o f shot hole and the lithology excited are interdependent factors, affecting recording quality. Data analysis indicates, that shot in a single drill hole of depth more than 25m yields good recording,while array shot in drill holes of depth less than 25m can hardly receive deep reflections. The recording quality could be much improved with technical approaches, as slurry cementing and tamping after charging. During seismic data processing in view of the fact, that the lithology excited along the profile is varied very dramatically. surface consistency processing of wavelets and noise elimination were made, resulting in great improvement of the deep reflection stacked section in quality. |
| keywords:reflection crust depth of drill hole Moho MHF |
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