大庆油田剩余油的影响因素及分布

大庆油田现已进入高含水开发阶段,寻找和开发剩余油非常重要.大庆油田个密集井网区的实验结果表明,沉积微相是影响剩余油平面分布的主要因素,大型河道砂中的剩余油主要分布于砂体物性变差的部位,分流河道及水下分流河道砂中的剩余油主要存在于薄砂层或孤立的小透镜体中;沉积韵律层渗透性的差异控制剩余油的纵向分布,厚油层顶部是剩余油富集的有利区段.另外,开发因素对剩余油的分布亦有一定的影响.不同成因的砂体中,剩余油分布不同.分流河道砂体、分流间砂体及水下分流砂体因非均质性严重,故易形成剩余油.

DISTRIBUTION CHARACTERISTICS AND CONTROLLED FACTORS OF RESIDUAL OILS IN DAQING OILFIELD

The test results of three dense well net regions in Daqing Oilfields indicate that sedimentary microfacies is the main factor influencing the planar distribution of residual oil.In large channel sand bodies,the residual oil is mainly distributed in the places with poor physical property;in distributary channel sand bodies,the oil is usually preserved in thin sand laminaes and sand lens.The top part of thick oil horizon favours the enrichment of residual oil,and exploration factor also has some influence on the distribution of risidial oil.