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从成盆、成源、成烃和成藏4个方面对海拉尔盆地乌尔逊—贝尔凹陷各构造演化阶段的石油地质意义进行了分析。海拉尔盆地成盆的动力机制是中蒙边界区中生代推覆构造形成后的晚造山期伸展垮塌作用,为典型的被动裂陷盆地。乌尔逊—贝尔凹陷形成演化经历了5个时期:山间残留阶段、被动裂陷阶段、主动裂陷阶段、断坳转化阶段和坳陷阶段。被动裂陷阶段沉积物震荡式沉积形成南一段中部砂泥互层的优质烃源岩;主动裂陷阶段盆地强烈裂陷,窄而深的断陷结构控制盆地南一段上部有效源岩分布;断坳转化阶段盆地快速沉降促进烃源岩熟化,伊敏组沉积晚期烃源岩大量排烃控制形成早期原生油藏,伊敏组末期盆地反转,部分油藏受活动断裂破坏调整到大磨拐河组形成次生油藏。不同演化阶段形成多种类型的隆起带,构成有利的油气聚集区带,控制了不同含油气系统油气聚集。
The significance of petroleum geology in the tectonic evolution stages of Wuerxun - Beier sag in Hailaer basin is analyzed from the aspects of genesis, source, hydrocarbon generation and accumulation. The dynamic mechanism of basin forming in Hailar Basin is the late orogeny extensional collapse after the Mesozoic nappe structure was formed in the Sino-Mongolian border region, which is a typical passive rift basin. The evolution of the Wuerxun-Beier sag has undergone five stages: the mountain residual stage, the passive rifting stage, the active rifting stage, the fault depression conversion stage and the depression stage. In the passive rifting stage, the sedimentary sedimentary deposits form high-quality source rock in the middle sand-mud interbeds in the south section of the basin. The active rifting basin is strongly rifted and the narrow and deep fault-structure controls the distribution of effective source rocks in the upper part of the south section of the basin. The rapid subsidence of the basin in the transitional stage promoted the maturation of source rocks. The late Paleotectamis Yiyin Formation controlled a large amount of hydrocarbon generation and controlled the formation of early-stage crude oil reservoirs. The late-stage basin of the Yimin Formation reversed and some of the reservoirs were disrupted by active fractures. Hexi Formation secondary reservoir. Various types of uplifts are formed in different evolution stages to form favorable hydrocarbon accumulation zones and control the accumulation of hydrocarbons in different petroleum systems.