摘要
为了明确长7致密油储层特征对其开展综合评价。首先,通过岩心观察、薄片鉴定和岩心分析等,认为长7致密油储层物性、含油性、脆性等属性参数具有分布频带宽、变化快的特征。其次,基于聚类分析方法,选取7个相对独立的参数用于储层分级评价,并界定了相应参数的分级标准。在此基础上,运用灰色系统理论,定量各评价参数的权系数,计算出储层综合评价因子,对镇北地区西233井区长721致密油储层开展综合定量评价。结果表明:西233井区以Ⅱ、Ⅲ类储层为主,两者分布面积约为65%,其中Ⅰ类、Ⅱ类储层主要分布于三角洲前缘水下分流河道,Ⅲ、Ⅳ类储层分布于河道砂体侧翼。
In order to define the characteristics of Chang-7 Formation tight oil reservoirs,the comprehensive evaluation of the reservoirs were carried out. Firstly,with the help of the core observation,thin section identification,core analysis,etc.,the following conclusions were drawn： the reservoir attribute parameters such as physical properties,oiliness and brittle abilities and so on possess the following characteristics： wider distribution frequency band and faster change. Secondly,based on the cluster analyzing method,7 relatively independent parameters are selected to classify and evaluate the reservoirs and determine the grading criteria of the corresponding parameters. On the basis of the above,the grey system theory was applied to quantify the weight coefficients of each evaluating parameter and calculate the comprehensive evaluation factors of the reservoirs,and furthermore the quantitative evaluation was performed for Chang-721 tight oil reservoirs in Well Block Xi233 of Zhenbei area. The achievements show that Type Ⅱand Ⅲ reservoirs are dominant in the block,the distribution areas of the both are about 56%,Type Ⅰand Ⅱreservoirs are mainly distributed in the underwater distributary channels of the delta front,and Type Ⅲ andⅣ reservoirs are generally distributed in the wings of the channel sandbodies.
作者
孙兵
刘立峰
丁江辉
SUN Bing LIU Lifeng DING Jianghui(PetroChina Research Institute of Petroleum Exploration ＆ Development, Beijing 100083, China School of Energy Resources, China University of Geosciences , Beijing 100083, China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2017年第4期147-152,共6页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项"致密油开发目标评价优选"(2016ZX05046003-001-002)
关键词
鄂尔多斯盆地
镇北地区
储层特征
灰色系统
储层综合评价
长7致密油
Ordos Basin
Zhenbei area
reservoir characteristic
grey system
reservoir comprehensive evaluation
Chang-7 tight oil
