| PDF: | |
| Time: | 2012 |
| Journal: | OGP |
| Volumn: | 47 |
| Issue: | 2 |
| Pages: | 323-330 |
| Type: | EI |
| Author: | Huafeng Tang,Mifu Zhao,Xuanlong Shan,Pujun Wang |
Abstract: | Seismic-geology characteristics of volcano stratigraphy of Yingcheng Formation were discussed by integrated analyses of volcanic boundary, volcanic units and seismic facies units. There are three viewpoints about seismic-geology characteristics of volcanic rocks. Firstly, almost boundary of volcano stratigraphy of Songliao Basin was the angle or volcanic disconformity, the other was parallel disconformity or conformity. Secondly, the unit of volcano stratigraphy could divide into cooling units, cooling units group, volcanic edifices and volcanic edifices group according to the building process and the boundary characteristic. In the resolution of current seismic data can exact reveal the volcanic edifices or its group. Thirdly, the seismic facies units of 1st and 3ed member of Yingcheng Formation were divided into 9 types. They are sheet-shaped, sheet-shaped drape, shield-shaped, mount-shaped, lens-shaped, wedge-shaped, fan-shaped, saucer/plate-shaped and pipe-shaped. The seismic facies units can be explained to the volcanic edifices. The dip angle of volcanic rock bed(s) decreases from central to distal parts along a given edifice’s limb. The relative geological framework of volcano stratigraphy (cooling units group) can be built according to the overlap sequence of rock bed(s) in seismic facies units. This is a new way to characterize the volcano stratigraphy. |