景谷盆地遥感地质解译及原盆地恢复

REMOTE-SENSING GEOLOGICAL INTERPRETATION AND RECOVERY OF THE ORIGINAL BASIN IN JINGGU BASIN, YUNNAN, CHINA

云南景谷盆地是迄今世界上最小的含油气内陆盆地。遥感地质解译发现该盆地北西和南东各有一条具正断层性质的走滑断层。两条断层呈北东向雁行斜列,左行走滑,并将盆地周边的构造有机地联系起来。景谷盆地的原盆地——大景谷盆地则是中新世时形成于两条走滑断层左侧叠覆区内的地堑式菱形断陷盆地。大景谷盆地的面积是现今景谷盆地的4倍左右,其沉积盖层有较大的厚度被剥蚀掉了。大景谷盆地的形成和发展为盆地油气藏的形成创造了良好的条件。

The Jinggu basin in Yunnan is the smallest oil-bearing basin in the world. Its dimension is only 88 km^2. It has already been found that there are two strike-slip downfaults in the circumambient area of the basin. One lies in the northwest of the Jinggu basin and another the southeast. They are all northeast strike, echelon and left-lateral strike-slip. The circumambient structures of the Jinggu basin are connected organically by them. In the overlap part of the two main faults, the left-lateral strike-slip movement of them in Miocene Epoch formed the rhomboid and graben downfaulted Big Jinggu Basin the original basin of the Jinggu basin. The dimension of Big Jinggu Basin is four times the present-day Jinggu basin. And the huge thickness of sedimentary blanket in Big Jinggu Basin has been denuded later. The good (environment) generated by pull-apart actions have provided excellent conditions for oil and gas (accumulations).