二连盆地下白垩统岩性地层油藏构造控制因素

根据地震、测井及钻井信息和层序地层学理论,对二连盆地岩性地层油气藏类型进行的深入研究表明,影响二连盆地下白垩统岩性地层油藏的主要因素有断陷结构的类型、坡折带控砂模式和断裂调节带类型。根据构造样式,将二连盆地断陷结构进一步细分为单断断超式、单断断槽式及复合式3种类型;将坡折带控砂模式细分为陡坡断崖型与近岸水下扇、陡坡断坡型与近岸水下扇—浊积扇、陡坡断阶型与扇三角洲—浊积扇、缓坡斜坡型与辫状河三角洲—扇三角洲、缓坡挠曲型与扇三角洲—浊积扇、缓坡断阶型与辫状河三角洲或扇三角洲—浊积扇6种类型;将断裂调节带划分为断层断弯型、断层断接型、断层交叉型和断沟型4种类型。对不同类型构造控制因素进行了分析,为二连盆地岩性地层油藏的研究和勘探提供了理论依据。

Control factors for structure of stratigraphic and lithologic reservoirs in the Lower Cretaceous of Erlian Basin

On the basis of seismic, logging and drilling information, the property of the stratigraphic and lithologic reservoirs in the Lower Cretaceous of Erlian Basin were analyzed with the sequence stratigraphy. Three factors for controlling the structure of those reservoirs include the rift structures, the sand control patterns of slope break and the fault transfer zones, which influence petroleum accumulation in this area. The rift structure can be divided into three types of single fault overlap, single fault trough and complex type. The slope break has six patterns, including steep slope fault scrap and nearshore subaqueous fans, steep slope fault ramp and nearshore subaqueous fans and turbidite fans, steep slope fault bench and fan-delta and turbidite fans, gentle slope and braided river delta and fan-delta, gentle slope flexure and fan delta and turbidite fans, and gentle slope fault bench and braided river delta or fan-delta and turbidite fans. There are four types faults-transfer zones in Erlian Basin, such as fault bend type, fault fracture type, fault intersection type and fault trace rift type. The analyses of different factors for controlling the structures can provide some information for exploring of stratigraphic and lithologic reservoirs in Erlian Basin.