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综合运用地震、岩心、薄片、地球化学分析资料,分析歧口凹陷歧北斜坡沙一下亚段致密油形成地质要素,明确了勘探潜力。研究认为,歧北斜坡沙一下亚段稳定平缓的构造背景、大面积分布的优质烃源岩、大面积分布的非均质致密砂岩储层、源储共生及近距离运移聚集有利于形成较大规模的致密油。歧北斜坡沙一下亚段发育多期远岸水下扇沉积,其中中扇亚相及断裂发育区储层物性相对较好,形成常规油藏;外扇亚相薄层致密砂岩发育,致密油大面积分布,形成典型的常规油与致密砂岩油纵向相互叠置、横向叠合连片的油藏分布序列。通过储层预测圈定致密油分布范围163km2,板2上薄层浊积席状砂甜点区是致密油钻探的首选区。
By comprehensively using the data of seismic, core, thin slice and geochemical analysis, the geological elements of the sub-tight sub-sand of the sub-Sa sand in the Qifankou depression on the northern slope of the Qikou depression are analyzed, and the exploration potential is clarified. The study shows that the stable subduction tectonic setting of the sub-subsurface sand slope of Qibie slope, high-quality source rocks with large area distribution, heterogeneous tight sandstone reservoirs with large area distribution, source-reservoir symbiosis and short-distance migration and accumulation are favorable for the formation of Large-scale tight oil. Multi-period submarine submarine fan is developed in sub-sub-slope of Qifeng slope, among which medium subfacies and fault zone have relatively good reservoir physical properties, forming conventional reservoirs; development of tight sandstone of sub-facies thin sublayer and tight oil Large-area distribution, the formation of a typical conventional oil and tight sand oil stacked vertically stacked, laterally superimposed contiguous reservoir distribution sequence. The tight oil distribution range of 163km2 is delineated by reservoir prediction, and the turbid sandy dessert zone on plate 2 is the preferred zone for tight oil drilling.