松辽盆地梨树断陷十屋油田营城组层序地层及沉积体系

松辽盆地梨树断陷十屋油田营城组的岩心观察显示，其发育碎屑岩，局部发育安山岩、凝灰岩。营城组可划分为4 个三级层序: S7 ( 营四段) 、S8 ( 营三段) 、S9 ( 营二段) 和S10 ( 营一段) ，反映营城组时期湖平面发生过4 次较大规模的变化，层序发育较完整、连续性较好。层序7 属于深水型沉积，主要发育水下扇; 层序8 属于半深水型盆地边缘沉积，以发育三角洲和扇三角洲为特征; 层序9 和层序10 都属于浅水型沉积，发育棕褐色泥岩。以层序9 为例，区内主要发育的沉积体系类型为扇三角洲沉积体系、三角洲沉积体系和湖泊沉积体系，可进一步识别出扇三角洲前缘、三角洲前缘、三角洲平原、浅湖和半深湖等5 种亚相，水下重力河道、滑塌重力流、河口坝、间湾、水下扇和静水泥等19 种微相，以发育水下扇和水下重力河道沉积为特色。

Yingcheng Formation sequence stratigraphy and depositional system of Shiwu oilfield in Lishu fault depression, Songliao Basin

The observation on drilling cores of Yingcheng Formation indicates that the main kinds of lithology are clastic rocks, interbeded with andesite lava and tuff in Shiwu oilfield, Lishu fault depression of Songliao Basin. The Yingcheng Formation can be divided into 4 sequences in third order： S7 （ Ying 4）, S8 （ Ying 3 ）, S9 （ Ying 2） and S10 （ Ying 1 ）, which developed and continued well in occurrence, reflecting 4 large-scale changes of lake level. The Sequence 7 is a deep-water deposition, mainly developing underwater fan. The Sequence 8 is a kind of semi-deep-water deposition in the edge of basin, mainly developing delta and fan-deha. The Sequences 9 and 10 are shallow depositions, mainly developing brown mudstone. The main depositional systems of Sequence 9 are the fan delta, the delta and lacustrine depositional systems. Five kinds of subfacies including fan-delta front, delta front, delta plains, shallow lakes and semi-deep lake, and 19 kinds of micro-facies including underwater gravity channel, slump gravity flow, mouth bar, inter-bay, subaqueous fan and mud of still water, are further identified, which are characterized by the subaqueous fan and underwater gravity channel in this area.