文中油田文15块沙三段上亚段特高含水油藏剩余油分布

Remaining oil distribution of extra-high water-cut reservoirs in upper Es_3 member of Wen15 block,Wenzhong Oilfield

针对文中油田文15块沙三段上亚段特高含水期油藏精细描述及调整挖潜工作,分析了该区油藏剩余油的分布特点,指出了主力油层剩余油储量丰度较高。阐明了剩余油主要在断层遮挡、构造高部位或断鼻上倾方向富集;受沉积微相影响,平面上剩余油主要富集在河道边缘、侧翼及前缘的Ⅱ类和Ⅲ类储层中;纵向上正韵律层水淹模式水下分流河道中上部剩余油富集程度高;油层注水开发中高渗透层的层间干扰导致相对低渗透层剩余油分布更为突出;注采井网不完善及水驱损失也造成不同程度的剩余油滞留。研究区剩余油分布总体比较零散,平面上主要以豆粒状、团块状和条带状分布富集;纵向上集中分布在部分动用相对较低的主力油层中,油层动用不充分,呈现严重的非均质特征。

In accordance with fine reservoir description and potential tapping measures at extra-high water-cut stage in upper Es3 reservoir of Wen15 block,Wenzhong Oilfield,the features of remaining oil distribution were analyzed. Major reservoirs have a reserves abundance of the remaining oil,and the remaining oil distributes at fault block,high structure or the direction of dump of nose-like structure. Laterally,the main areas with abundant remaining oil are the type Ⅰ ,Ⅱ reservoirs of the edge,flank or front of river channel. Vertically,the main areas are normal rhythm layers of flooding model in the upper of under-water distributary channel. Inter-layer interference of high permeability layers in water flooding development of reservoirs leads to a high value of relatively low-permeability layer in remaining oil distribution. The imperfect injection-production well network and the loss of water flooding also result in certain remaining oil. Overall the remaining oil distribution in the interesting area was divergent and enriching as the shape of bean,pisolite and band laterally,and mainly distributes in the main reservoir with relatively low development extent vertically and strong heterogeneity.