松辽盆地坳陷陡坡英台扇三角洲复合体沉积特征
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摘要
采用地质、测井、地震等研究方法对该区的岩性、电性、古生物、微量元素、地震特征作了详细的研究。采用负载类型研究了河流类型,用古厚度恢复法研究了古坡度。结合本区构造发育史。确认松辽盆地三大砂体之一的英台砂岩体是在坳期陷期形成的长期发育的东倾陡坡、干旱～半干旱气候、源近流短多突发性辫状河入湖条件下沿坳陷陡坡发育的英台、红岗、他拉哈三个扇三角洲组成的复合体。英台扇三角洲复合体具有与正常三角洲相同的反粒序及三元结构,但又以其水上平原不发育等多种特征有别于正常三角洲和断陷湖盆典型扇三角洲。从而建立了坳陷湖盆陡坡型扇三角洲模式。打破了国内外仅在断陷湖盆形成扇三角洲的观点。
According to geology, well logging, seismic methods, the detail approaches about
lithology, electric features, palaeontology, trace elements and seismic characteristics
have been made. By using the loading types and the recovery of palaeothickness, the
types of rivers and the ancient slopes have been establisbed. Through the structural de-
veloping history, the paper verifies that Yingtai fan delta complex, one of the three
biggest sandbodies, is a complex that consists of three fan deltas of Yingtai, Honggang
and Talaha which had been formed on controls of the input the basin of the long devel-
oping steep slopes, dry-medium dry climate, near provenances and abruptly short
braided steam's environments.
Yingtai fan delta complex is comparable on aspects of the reverse grain sezeorder
and the three units' structure, but is distinct for lack of flood plains to the ordinary fan
deltas. Therefore, the paper has broken up the views on the formation of fan deltas in
fracture basins in China and outside and has established the patterns of fan deltsa on the
steep slopes in a depression basin.
According to geology, well logging, seismic methods, the detail approaches about
lithology, electric features, palaeontology, trace elements and seismic characteristics
have been made. By using the loading types and the recovery of palaeothickness, the
types of rivers and the ancient slopes have been establisbed. Through the structural de-
veloping history, the paper verifies that Yingtai fan delta complex, one of the three
biggest sandbodies, is a complex that consists of three fan deltas of Yingtai, Honggang
and Talaha which had been formed on controls of the input the basin of the long devel-
oping steep slopes, dry-medium dry climate, near provenances and abruptly short
braided steam's environments.
Yingtai fan delta complex is comparable on aspects of the reverse grain sezeorder
and the three units' structure, but is distinct for lack of flood plains to the ordinary fan
deltas. Therefore, the paper has broken up the views on the formation of fan deltas in
fracture basins in China and outside and has established the patterns of fan deltsa on the
steep slopes in a depression basin.
引文
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