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大庆油田的储集层是一套内陆浅水湖盆河流─三角洲体系的沉积物，在漫长复杂的沉积过程中，不仅形成了高能环境下的沉积物，同时也形成了碎屑物质供应不足的低能环境下的沉积物，这种低能环境下的沉积物，主要是以油斑、油浸产状为主的泥质粉砂岩，分布于高能环境沉积物的顶、底、周边及内部变差部位，通常不能被划为有效厚度界限以内，因而未被列入储量表内，被称为表外储层，这类储层虽然单层厚度很薄、面积小，但储量潜力较大，而且与好油层一般都是连通的，将其划为隔层，影响了油田开发的整体效果，因此研究这类储层的开发对大庆油田整体开发效果的改善具有重要意义。通过研究和矿场试验，对大庆喇、萨、杏油田表外储层地质特征、潜力公布有了清楚的认识，摸索出了一套开发表外储层的作法，为进一步挖掘表外储层潜力提供了理论和实践依据。
The reservoir of Daqing Oilfield is a set of sediments of inland shallow lacustrine rivers and deltaic systems. In the long and complicated deposition process, not only sediments under high-energy environment but also insufficient supply of detritus material Sediments under low-energy environment, this kind of sediments under the low-energy environment mainly consist of argillaceous siltstones with oily spots and oil-soaked occurrences, which are distributed in the top, bottom, periphery and interior of high-energy environment sediments The site, which can not normally be classified as effective thickness limits, has not been included in the inventory table and is known as off-table reservoirs. Although these reservoirs are thin and small in area, they have great reserves potential and It is generally connected with the good oil layer, which is divided into compartments, affecting the overall effect of oilfield development. Therefore, it is of great significance to study the development of such reservoirs to improve the overall development of Daqing oilfield. Through research and field tests, we have a clear understanding of the geologic features and potential prospecting of the epi-surface reservoirs in the Daqing La, Sa and Xing fields and have developed a set of methods for developing epi outer reservoirs. In order to further excavate off-table reservoirs Potential provides theoretical and practical basis.