摘要
以松辽盆地扶余油田J19区块泉头组四段为例，在沉积微相研究的基础上，综合应用岩心、测井、生产动态等资料，对三角洲前缘复合水下分流河道内部的单砂体进行定量识别。研究结果表明，研究区单砂体叠置类型主要包括分离式、叠加式、切叠式、替代式4种垂向叠置样式和间湾接触、堤岸接触、对接式、侧切式、替代式5种平面接触样式，并总结了相应的识别标志。研究区单砂体宽度介于200~800m，单砂体厚度介于4~8m。分离式的叠置砂体顶部剩余油富集；叠加式、切叠式、替代式（垂向）叠置类型的砂体厚度不同、注水方向不同，对剩余油分布范围有较大影响。间湾接触、堤岸接触、对接式的砂体横向不连通，在两个单砂体之间易形成侧翼剩余油富集；侧切式和替代式的砂体，横向连通性好，剩余油不易富集。
Abstract
Taking the fourth member of the Quantou Formation in J19 block of Fuyu oilfield as an example, single sandbodies identification was performed within composite underwater distributary channels in delta front by integrating various data including cores, logging and production performance on the basis of sedimentary micro-facies.The results show that there are four main vertical superimposition patterns of single sandbodies, including separated type, overlap-type, overlay type and substitution type, and five lateral contact patterns, including interdistributary contact, embankment contact, butt-joint, side shear and substitution type.The corresponding identification marks are also summarized.The width of single sandbody is in the range from 200-800m and their thickness range from 4-8m.The tops of the separated type sandbodies are rich in remaining oil.In overlap-type, overlay type and substitutional type sandbodies are different in thickness and water injection direction, thus strongly influencing remaining oil distribution.Sandbodies of interdistributary contact, embankment contact and butt-joint kinds are not interconnected laterally, thus remaining oil possibly occurring in the flanks of the sandbodies.In contrast, sandbodies of side shear and substitutional type are well connected laterally, unfavorable for enrichment of remaining oil.
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