杏六区东部分流河道内渗流段对水淹的控制作用

Seepage zones in distributary channel in East X-6 Block and its control effect on water flooding

吕端川 程祥 狄喜凤 吴博然 沈贵红4

中国石油大学（华东）地球科学与技术学院，山东 青岛 266580 山东省油藏地质重点实验室，山东 青岛 266580 中国石化中原油田分公司油气勘探管理部，河南 濮阳 457001 中国石油冀东油田分公司，河北 唐山 063000

School of Geosciences, China University of Petroleum, Qingdao 266580, China Shandong Province Key Laboratory of Reservoir Geology, Qingdao 266580, China Department of Oil and Gas Exploration and Management, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Jidong Oilfield Company, PetroChina, Tangshan 063000, China

为了分析杏六区东部特高含水阶段单砂体内的水淹规律，确定小井距、密井网生产条件下剩余油的形成机理，在对取心井岩心观察的基础上，结合密集取样点的物性及含油性测试资料，通过计算渗透率相对变化率得到具有不同渗流特征的流动单元，具有一定厚度且相对均质的流动单元可作为单砂体内的渗流段。结果表明：研究区分流河道成因的单砂体内发育单一渗流段、2个渗流段、多个渗流段3种类型，其中强水淹段的厚度百分比在发育单一渗流段类型的单砂体内最高，在发育多个渗流段类型的单砂体上部最低。该比值在单一渗流段内随渗流段厚度的增大而减小，且在2个及多个渗流段类型的单砂体下部差异不明显。

In order to analyze the law of water flooding in single sand body in East X-6 Block at ultra-high water cut stage and to determine the formation mechanism of residual oil under production condition of small and close well spacing, based on the observation of coring wells, combined with the physical properties and oil test data of dense sampling points, flow units with different seepage characteristics were obtained by calculating the relative change rate of permeability. Taking the flow unit with a certain thickness and relative homogeneity as a seepage zone in a single sand body, the results show that there are three kinds of seepage zone combinations in single sand body, single seepage zone, two or multiple seepage zones. The thickness ratio of flooded section in the type of single seepage zone is the largest, and that in the type of multiple seepage zone is the lowest. This ratio decreases with the increase of the thickness of single seepage zone, and there is no obvious difference in the lower part of single sand body with two or multiple seepage zones.

10.6056/dkyqt201901016