博兴洼陷沙四段滩坝砂岩油藏具有规模大、但隐蔽性强、储层横向变化大的特点，勘探难度较大。滩坝砂岩油藏分布规律认识不清是制约滩坝砂岩油藏勘探的根本原因。因此，研究滩坝砂岩油藏成藏规律，不仅具有重要的理论意义，而且具有非常重要的实用价值。 本文针对博兴洼陷沙四段滩坝砂岩油藏成藏规律认识上的不足，充分运用了层序地层学、含油气系统学和成藏动力学、地球物理学以及计算机技术等学科的最前沿技术，对该类油藏成藏过程中的成藏要素、成藏机理及成藏模式研究、油气富集规律及其控制因素等进行了细致深入的研究，总结出了滩坝砂岩油藏的成藏规律。通过研究，得到有关滩坝砂岩油藏的一些重要结论，例如认为：滩坝砂储层分布是控制该类油藏的主导因素；滩坝砂体交错，易形成纵向叠置，横向迭合连片的油藏；地层压力差对其成藏动力学特征具有重要影响等。这些重要结论，不仅丰富和发展了隐蔽油藏勘探技术，而且对于盘活整个济阳坳陷沙四段滩坝砂岩油藏，解放大批优质储量具有重要的现实意义。 利用研究结果，已在博兴洼陷部署井位20余口，探明高89块石油地质储量3689万吨，取得了较大的勘探效益。

The beach and bar sand reservoir in the fourth member of Shahejie has the character of large scale and much concealed ，The reservoirs change much quickly and it is hard to explore this type of reservoir. The essential reason which inhibits the exploration of the reservoir is that we are still not aware the rules of oil reservoir distribution clearly. Therefore it is important to study the rule of forming of oil reservoir for theory meaning and practice. Meaning. Using modern techniques such as seguence stratigraphy,、reservoir forming dynamic、geophysics and the computer tecnology, this article has studied systematically the essential factors of the reserver forming、 the mechanism and styles of reserver forming、the rules of oil-gas enrichment and the control factors.And gain some special viewpoints such as: the distribution of the reservoir is the key factor of the oil reservoir accumulation; It can form a wide scope oil reservoir because the single reservoir interweaving each other;The stratum pressure has the important effect on the reservoir forming dynamic. These important conclusion will not only enrich and develop the technology of exploration the hidden reservoirs t, but also has important reality meaning for gaining a large amount of reservoir in Jiyang depression. Using the study result, more than 20 wells has been drilled in Boxing subsag,which verified geology reserve 368,9 thousand tons in Gao 89 block,gained big explorer benefit.