石油物探2017，Vol.56Issue(5)：626-636,11.DOI:10.3969/j.issn.1000-1441.2017.05.002
羌塘盆地高密度高覆盖宽线采集技术试验
Acquisition technique test of high-density and high-fold wide line profiling seismic survey in Qiangtang Basin
摘要
Abstract
In 2015,to improve the acquisition quality of seismic data in the Qiangtang Basin and make a breakthrough in hydrocar bon geophysical prospecting technology,we conducted a series of seismic acquisition tests on general vibroseis,low-frequency vibroseis,large-tonnage vibroseis,and explosive sources,as well as high-density and high-fold wide line profiling tests,in North Qiangtang Depression,Central Uplift Belt,and South Qiangtang Depression.The results were as follows:①The optimum exciting parameters for general vibroseis were as follows:the vibration pattern was of three diesels vibrating for one time,the drive level was 70％,the sweep frequency ranged from 6 Hz to 84 Hz,and the sweep length was 18 s.The optimum exciting parameters for low-frequency vibroseis were as follows:the vibration pattern was of two diesels vibrating for one time,the drive level was 60％,the sweep frequency ranged from 1.5 Hz to 84 Hz,and the sweep length was 16 s.The optimum exciting parameters for large-ton nage vibroseis were as follows:the vibration pattern was of two diesels vibrating for one time,the drive level was 70％,the sweep frequency ranged from 6 Hz to 84 Hz,and the sweep length was 16 s.The optimum exciting parameters for the dynamite sources were as follows:a single hole had a depth of 7 m below the high-velocity layer (or above 18m in depth),charge sizes were 18kg,and the combination array shooting pattern was two holes× 15 m× 12 kg or three holes × 12 m × 8 kg in areas with unfavorable surface conditions.②Although the energy,signal-to-noise ratio,bandwidth,and wavelet coherence of the shot record by the vibroseis were not as good as those of the borehole explosive,the quality of seismic sections obtained by the vibroseis using a high-density and high-fold acquisition technique might be equal to or superior to that of the borehole explosive.③Because it is an environmentally friendly,safer,more economical,and highly efficient operation mode,the high-density and high-fold wide line profiling acquisition technique,which is a combination of the vibroseis and the borehole explosive source,is much more suitable to the Qiangtang Basin.The layout chart by the vibroseis can be designed as 3S3L or 2L3S,with a minimum fold of 960 times.The layout chart by the borehole explosive can be designed as 2L3S or 3L2S,with the fold ranging from 300 to 360 times.关键词
羌塘盆地/地震采集试验/可控震源/高密度,高覆盖/宽线Key words
QiangTang Basin/seismic acquisition test/vibroseis/high-density/high-fold/wide line分类
天文与地球科学引用本文复制引用
李忠雄,尹吴海,蒋华中,叶天生,马龙,卫红伟,赵刚..羌塘盆地高密度高覆盖宽线采集技术试验[J].石油物探,2017,56(5):626-636,11.基金项目
国土资源部陆域能源矿产地质调查计划西藏托纳木-笙根地区油气地质调查([2015]01-01-01-002)、西藏隆鄂尼-鄂斯玛地区油气地质调查([2015]01-01-01-001)、西藏半岛湖地区油气地质调查([2015]01-01-01-003)项目联合资助.This research is financially supported by the Continental Energy Resources Geological Survey Plan by the Ministry of Land and Resources(The oil and gas geological survey in Tibetan Tuonamu-Shenggen region (Grant No.[2015]01-01-01-002),the oil and gas geological survey in Tibetan Longeni-Esima region (Grant No.[2015]01-01-01-001) and the oil and gas geological survey in Tibetan Bandaohu region (Grant No.[2015]01-01-01-003). （[2015]01-01-01-002）
