东营凹陷古近系深部碎屑岩有效储层 物性下限的确定

Determination of physical property lower limit of deep clastic effective reservoirs of Paleogene in Dongying depression

关键词:  有效储层  物性下限  影响因素  古近系  东营凹陷

Key words:  effective reservoir  physical property lower limit  influence factor  Palaeogene  Dongying depression

摘要:

东营凹陷古近系深部碎屑岩储层岩心、试油、实测物性等资料较缺乏,导致有效储层物性下限计算困难。综合运 用分布阐数曲线、测试、试油和束缚水饱和度等方法，确定研究区有效储层物性K限,并对其影响因素进行分析。结果 表明:有效储层孔隙度下限与深度的对数呈线性关系，渗透率下限与深度呈指数函数关系;有效储S物性下限受储层性 质、原油性质、温度、压力等因素的影响，次生孔隙会增大有效储层孔隙度下限，原油密度、黏度越低，有效储层物性下限 越小’地/2温度增加、深部超压均会使有效储层物性下限降低;有效储层物性下限主要由温-压系统控制。

Abstract:

Due to the lack of core, formation testing and testing physical properties data, it is difficult to determine the physical property lower limit of the deep clastic effective reservoir of Palaeogene in Dongying depression. By applying distribution function curve, testing, formation testing and irreducible water saturation method, the physical property lower limit of researched area was determined，and the influence factors were analyzed. The results show that the porosity lower limit and log depth are linear relationship, and the permeability lower limit and depth are exponential relationship. The reservoir property, crude oil property, temperature and pressure affect physical property lower limit of effective reservoir. Secondary pores increases the porosity lower limit of effective reservoir. The lower the density and viscosity of crude oil，the smaller the physical property lower limit of effective reservoir. The physical property lower limit of effective reservoir reduces with temperature rising or deep overpressure. The physical property lower limit of the effective reservoir is mainly controlled by temperature-pres-sure system.