海拉尔盆地贝尔凹陷油气分布规律及主控因素研究

Study on Hydrocarbon Distribution and Control Factors of Beir Sag in Hailar Basin

海拉尔盆地贝尔凹陷经历了20多年的勘探,目前发现了构造油气藏、构造—岩性油气藏、构造—地层油气藏及潜山油气藏等多种油气藏类型。纵向上,油气主要分布于基底潜山、铜钵庙组及南屯组,其次在大磨拐河组地层中也见到少量的油气显示;平面上,油气分布主要集中在生烃次凹内及其周边的断裂带、潜山带内,以及生烃次凹附近的岩性砂体中。贝尔凹陷油气藏形成与分布主要受生烃次凹、断裂构造带和不整合面及沉积相的控制。

Through more than 20 years'exploration, a variety of hydrocarbon reservoirs were discovered in Beir sag, Hailar Basin, including the structural hydrocarbon reservoir, the structural-lithologic reservoir, the structural-stratigraphic reservoir, and the buried-hill reservoir. Vertically, oil and gas are mainly distributed in buried hill in basement, Tongbomiao Formation and Nantun Formation, and small amount of hydrocarbon indication was seen in the strata of Damoguaihe Formation. Horizontally, oil and gas are mainly distributed in the hydrocarbon-generating secondary sag, and its surrounding fault zone and buried-hill zone, as well as the lithologic sand body near it. Formation and distribution of hydrocarbon reservoirs in the sag are mainly determined by hydrocarbon-generating secondary sag, the fault zone, unconformity and sedimentary facies.