摘要:
戈木错测区位于羌塘盆地中央隆起带北缘,在该区开展的天然气水合物区域地质调查成果表明该区具有较好生成天然气水合物的外部气源条件,输导构造条件、冻土条件、藏保条件,并圈定了天然气水合物有利区块.为研究适合于探测冻土区天然气水合物的地震方法技术和更好地勘探有利于天然气水合物分布区,在该区开展了浅层和中深层反射地震对比试验及勘查工作.试验结果表明:除浅层地震方法获得的地震剖面的分辨率较高和探测深度较浅外,在浅层和中深层反射地震剖面上反映的地质构造和地层分布特征类似.根据地震探测结果制作了测区地质构造图,依据测区地质资料和其他物化探资料,参考木里地区已知天然气水合物储层反射波的属性预测了测区天然气水合物有利分布区,并提出了验证孔位建议.
Abstract:
Gemucuo surveying area is on the northern margin of central uplift belt in Qiangtang basin.The results of regional geological survey of natural gas hydrate indicate that the area is provided with relatively good external gas source condition,transport tectonic condition,permafrost condition,reservoir and storage condition for generating gas hydrate and the delineation of the gas hydrate favorable block.In order to study the seismic method suitable for detecting gas hydrate and to better search for the distribution area of gas hydrate in the permafrost area,the authors carried out exploration work and contrast experiment of shallow and mid deep seismic reflection.The test results show that the characteristics of geological structure and stratigraphic distribution reflected in the shallow and mid deep seismic reflection profile are similar,except for that fact that the resolution is higher and the detection depth is shallower on the shallow seismic section.According to the results of the seismic exploration,the geological structure map of the survey area is made.On the basis of the geological data and other geophysical and geochemical data in the surveying area in combination with the attributes of reflection from known natural gas hydrate reservoirs in Muli surveying area,favorable distribution areas of natural gas hydrate are predicted,and the proposal of verification hole position is put forward.
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