Abstract:

Erlian Basin slope breaks can be classified into syndepositional slope break and palaeomorphological slope break, and furthermore, according to origin mechanism, slope breaks can be divied into structural, sedimentary and erosional slope breaks. Structural slope break is subdivided into fault and fold slope breaks with the characters of multilevel slope breaks. Sandbodies of highstand system track include highstand, the slope breaks control forming and distribution of fandelta, braided river delta and turbidite fans in highstand system track, which makes the sandbodies of highstand system track form updip wedgeout and lenticular lithologic traps. Slope breaks on multilevel slope breaks develop highstand sandbodies with different types and shapes. Moreover, distribution of highstand sandbodies is controlled by plane distribution of slope breaks, where rich hydrocarbon accumulation zones of lithological and stratigraphical reservoisr are formed.

Key words: slope break, highstand system track, sandbody, lithological and stratigraphical reservoir, Erlian Basin