柴达木盆地高陡构造地震勘探技术

Seismic data acquisition for high-steep structures in Qaidam Basin

柴达木盆地黄瓜峁—黄石高陡构造区,近年来采用高密度二维采集,资料品质有所提升,但在一些区域资料仍无法满足地质任务需求。分析以往地震资料,运用模型正演分析了影响柴达木盆地高陡构造区地震资料品质的主要因素,提出了适合该区的二维宽线高密度采集技术及一系列提高地震资料品质的措施,包括单点低频激发、小道距接收、合理选择线距等。这些技术措施为柴达木盆地高陡构造带地震勘探带来了新的技术思路,解决了该区资料品质多年来一直较差的技术瓶颈。

In recent years,seismic data quality has been improved by high density 2D acquisition in highsteep structural zones of Huangguamao-Huangshi,Qaidam Basin.But data quality in some other areas is still very poor and cannot meet geological task requirements.Based on seismic data in Huangguamao,Mangdong,and Huangshi,the main factors that affect data quality are recognized by forward modeling.In order to improve seismic data quality in this kind of areas,we propose an idea of high-density wide line and other measures including broadband point source,small receiver interval,and reasonable line spacing.Field applications demonstrate that the proposed idea and measures have achieved good data quality in high-steep structural belts in Qaidam Basin.