关键词: 松辽盆地, 白垩纪, 断阶, 沉积体系, 沙河子组, 林甸断陷

Abstract: Lindian fault depression of the Songliao Basin is composite in basin structure, which can be divided into slope-fault terrace zone, depression zone and fault uplift zone. Those sub-structural units controlled the contributions of provenances, stream systems and depositional areas, and also controlled the development of depositional systems and their types. The fault terrace zone controlled the occurrence and distribution of sand deposits, developing alluvial fan-fan delta system on the steep slope fault terrace and alluvial fan-fluvial-delta on the gentle slope fault terrace. The fault uplift zone was a drainage divide within the fault depression, developing fluvial-delta systems on its two sides. The hanging wall area of fault can be used not only as depositional area, but also as bypass for the sediments to the center area of deposition. The depression zone was controlled by a single fault or a couple faults, developing fine sediments of shore swamp and shallow lake, being a kind of source rock.

Key words: Songliao Basin, Cretaceous, fault terrace, depositional system, Shahezi Formation, Lindian fault depression