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基于地震、测录井、试油、岩心及分析化验资料,以渤海湾盆地歧口凹陷板桥—歧北斜坡区古近系沙河街组一段下亚段滨Ⅰ油层组为对象,开展层序划分、深水沉积相特征及模式分析,研究深水重力流规模性发育原因、储集层物性特征及主控因素,提出深水区有利储集相带的划分标准和预测方法。研究表明沙一下亚段滨Ⅰ油层组自下而上可划分为3个厚度在百米之内的五级层序;斜坡深水区沉积了一套远岸水下扇型重力流沉积,发育主水道、分支水道、水道侧缘、水道间泥及无水道区浊积席状砂等微相类型,空间上具有区域性多期多级的继承性和建设性发育特征,为扇三角洲—远岸水下扇—深湖相沉积序列,每一次重力流事件形成的远岸水下扇都可以划分为内扇、中扇和外扇3个亚相类型。以含砂率较高的扇三角洲前缘主砂体作为供给物源的“跨相搬运”砂体可形成优质储集层,孔隙度平均为15.1%、渗透率几何平均值为5.1×10~(-3)μm~2。明确了远岸水下扇主水道及分支水道分布区是最有利的勘探区域。
Based on the data of seismic, logging, oil testing, core and laboratory analysis, taking the first member of the Lower Member of the Shahejie Formation in the Banqi-Qibei Slope in the Bohai Bay Basin, The characteristics of deep-water sedimentary facies, and the pattern analysis, the reasons for the scale development of deep-water gravity flow, the physical properties of reservoirs and the main controlling factors are studied, and the division criteria and prediction methods for favorable reservoir facies belt in deepwater are proposed. The study shows that the lower part of the lower part of the sub-Sha1 oil layer can be divided into three layers of five grades within a hundred meters from bottom to top. In the deep-water area of the slope, a set of far-shore subaqueous fan-shaped gravity flow deposits are deposited. Waterways, branch channels, lateral edges of water channels, mud between channels and turbid sand like water-free zone, which have the characteristics of inherited and constructive regional multi-stage and multi-level spatial evolution. They are fan delta- Submarine fan - deep lacustrine sedimentary sequence, the formation of every gravity flow events can be divided into the distal fan underwater fan, fan and fan three subfacies. A high-quality reservoir could be formed by “cross-moving” sand bodies with high sand content in the fan-shaped delta front sand body as the source material, with an average porosity of 15.1% and a geometric mean permeability of 5.1 × 10 ~ (-3) μm ~ 2. It is clear that the submarine submarine fan channel and branch channel distribution area are the most advantageous exploration areas.