摘要
通过收集并重新处理已有的反射地震剖面,获得了一条南北向横贯羌塘盆地主体的270km长反射地震剖面。剖面显示:羌塘盆地可能具有元古代的基底并且南羌塘盆地较北羌塘盆地深。在南、北羌塘地壳浅部(约0～3s)变形差异较大,北羌塘褶皱变形强烈,呈现出隆凹变形相间的格局,南羌塘则相对较平缓。羌塘中央隆起之下为连贯的弧形反射,其北侧发育一个深度达8km的半地堑构造,规模较大,可为油气资源储存提供有利空间。
By collecting and reprocessing current reflection seismic profiles,we get a 270km profile across the Qiangtang basin at S-N direction.Profile shows：there are probably Proterozoic basement in Qiangtang basin.The depth of the basement is changeable;it is deeper in South Qiangtang basin and shallower in North Qiangtang basin.Shallow crustal deformations（about 0～3s） are quite different between North Qiangtang and South Qiangtang.In North Qiangtang,there are strong fold deformations and alternating uplifts and depressions,and relatively flat in South Qiangtang.Continuous arc reflections were found beneath the central uplift of the Qiangtang terrane.There is an 8km-depth half graben on the north side where may be a benefit storage space for oil and gas resources.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第11期3319-3326,I0001,I0002,I0003,3327,共12页
Acta Petrologica Sinica
基金
国家深部探测专项(SinoProbe-02-01,02-06)
国土资源部公益性行业科研专项(201011040、201011045、200811021)
国土资源部油气专项(XQ2004-06)
国家自然科学基金委创新群体项目(40921001)
国家自然科学基金项目(40830316、40874045)联合资助
关键词
羌塘盆地
基底结构
南北向变化
反射地震剖面
Qiangtang basin
Basement structure
N-S transformation
Seismic reflection profile
