高孔高渗砂岩油藏复杂油水关系主控因素——以长堤油田桩11块馆下段油藏为例

Controlling factors of complex oil-water relationship in high porosity and permeability sandstone reservoirs:Taking Lower Member reservoir of Guantao Formation in Block Zhuang 11, Changdi Oilfield as an example

刘西雷

Liu Xilei

中国石化胜利油田分公司地质科学研究院，山东 东营 257015

Geological Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

长堤油田桩11块是位于济阳坳陷沾化凹陷长堤断裂带东侧的一个自西向东倾斜的鼻状构造，其馆下段（馆下22和馆下31）为油藏主力含油小层，油水关系复杂，存在“水高油低”现象。文中利用岩心、测井及多种分析测试资料，通过综合研究认为，桩11块馆下段油藏的油水分布主要受控于该油藏成藏期的油气充注量与储层砂体微型构造形态的共同作用，同时还与区域性分布的优质盖层（隔层）等因素有关。通过分析该油藏的动态形成过程，建立了高孔高渗砂岩油藏复杂油水关系动态形成模式，为分析复杂条件下砂体的油水分布提供了一种可靠方法。

Block Zhuang 11 in Changdi Oilfield is a nosing structure sloping from west to east, located in Zhanhua Sag of Jiyang Depression and east of Changdi fault zone. The main sublayers Ngx22 and Ngx31 in Lower Member reservoir of Guantao Formation have complex water distribution, exhibiting a high water and low oil phenomenon. Based on the comprehensive study of cores, well logging and a variety of test data, it is thought that the oil-water distribution in Lower Member reservoir of Guantao Formation is mainly affacted by oil and gas injection volume during the reservoir accumulation period and the microtectonics of sand bodies, also relevant to the regional distribution of high quality cap rock (interlayer) and other factors. On this basis, through analyzing the dynamic formation process of reservoir, the formation pattern of inconsistent oil-water interface is established regarding high porosity and permeability sandstone reservoirs, which can provide a reliable method for analyzing the oil-water distribution of sand bodies under complex situations.

10.6056/dkyqt201402002