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歧口凹陷作为渤海湾盆地一个富油气凹陷,油气资源丰富。具有凹多、凸少、斜坡类型多的特点。随着勘探程度不断提高,斜坡区是今后勘探的重点领域。以歧北斜坡为例,通过强化斜坡成因演化及控砂、控藏机制研究,明确“基底差异沉降控制斜坡构造的形成,基底断裂控制斜坡构造的发育样式”斜坡构造成因机制、“内外物源供砂、调节沟槽输砂、陡缓坡折控砂”斜坡区多元控砂机制、“复式输导、2期充注、高油低气、差异聚集、优势相富集”斜坡区岩性地层控藏机制。创新发展了斜坡区油气成藏理论,探索形成了“选斜坡—建模式—求突破—描砂体—优方案”富油气凹陷斜坡区岩性地层油气藏勘探工作方法。有效指导了歧口凹陷斜坡区岩性地层油气藏预探实践,发现规模储量区。
The Qikou Depression is a hydrocarbon-rich depression in the Bohai Bay Basin with rich oil and gas resources. With concave, convex less, more types of slope characteristics. With the continuous improvement of exploration, slope area is the focus of future exploration. Taking Qijibei slope as an example, through the study of evolutional evolution of the slope and the mechanism of sand control and reservoir storage, it is clear that “the formation of the basement differential settlement control slope structure, the development pattern of the basement fault control slope structure ”, Both inside and outside the material source for the sand, adjust the channel sand, steep slope fold control sand “slope zone multiple sand control mechanism, ” compound guide, two filling, high oil and low gas, the difference accumulation, the dominant phase enrichment “Slope rock reservoir control mechanism. We have innovated and developed the theory of hydrocarbon accumulation in slope areas and explored the exploration methods of lithologic stratigraphic reservoirs in the slope areas of rich oil and gas depressions that have formed a ”slope-modeling-breakthrough-sandbody-optimization scheme." It effectively instructed the pre-exploration of lithologic stratigraphy in the slope area of Qikou Depression and found the scale reserves area.