山西黄土塬区三维地震勘探的实际应用
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摘要
寿阳平头镇三维地震勘探区位于寿阳—阳泉构造堆积盆地的西北部,属黄土丘陵地貌,梁、峁比较发育,相对高差一般在30～50m。本区第四系覆盖较厚,纵横向变化大,且该地层中夹有砾石层和钙质结核层,难以成孔,地震激发与接收困难较大。通过多次的试验工作,最终确定采用变观措施来解决表浅层地震地质条件极差问题:避开黄土覆盖较厚地段,将炮点变观到较薄地段或者是基岩出露地段,并尽可能加深炮孔到理想激发层位。通过变观处理,记录品质明显提高。
Pingtou Township 3D seismic prospecting area Shouyang is located in northwestern part of the Shouyang-Yangquan tectono-sedimentary basin.It belongs to loess relief and has developed loess ridge and loess hill landscapes drop in level is generally 30-50m.The area has thick Quaternary overburden it changes rapidly both vertically and horizontally and intercalated with pebble and calcareous concretion layers thus resulted in hard to borehole completion and difficult to seismic shot and receive.Through many experiments finally determine to use shotpoint transferring to cope with near-surface poor seismic geological condition keep away thick loess overburden transfer shotpoints to thinner or bedrock outcropping sectors and do best to deepen shotholes to perfect shot position.Through the shotpoint transferring record qualities improve obviously.
Pingtou Township 3D seismic prospecting area Shouyang is located in northwestern part of the Shouyang-Yangquan tectono-sedimentary basin.It belongs to loess relief and has developed loess ridge and loess hill landscapes drop in level is generally 30-50m.The area has thick Quaternary overburden it changes rapidly both vertically and horizontally and intercalated with pebble and calcareous concretion layers thus resulted in hard to borehole completion and difficult to seismic shot and receive.Through many experiments finally determine to use shotpoint transferring to cope with near-surface poor seismic geological condition keep away thick loess overburden transfer shotpoints to thinner or bedrock outcropping sectors and do best to deepen shotholes to perfect shot position.Through the shotpoint transferring record qualities improve obviously.
引文
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