当盆地基底沉降速率较快、发生海侵时，主要为油页岩沉积时期；

When the base of the basin subsided quickly with marine invasion, oil shale was deposited.

youdao

当盆地基底沉降速率较快、发生海侵时，主要为油页岩沉积时期；

When the base of the basin subsided quickly with marine invasion, oil shale was deposited.

youdao