摘要
为了深入研究致密砂岩露头储层的非均质性,解决致密砂岩储层非均质性影响因素多、综合定量表征储层非均质性难度大的问题,对柳江盆地二叠系山西组露头储层进行了系统化密集采样。利用地质统计分析、样品实验分析和显微镜薄片观察等方法,确定了致密砂岩储层各项性质及相关定量数据。同时基于洛伦兹曲线理论分析处理数据,运用层次分析法确定了渗透率、孔隙度、面孔率、填隙物含量和粒度等影响因素的权重,提出了综合定量表征致密砂岩储层非均质性的方法。研究表明,靶区山西组露头致密砂岩为强非均质性储层,区域垂直层面和平行层面的孔、渗特征近乎一致。孔隙度与渗透率之间的差相关性表明,基于突进系数、变异系数和级差等参数的传统非均质性评价方法不适用于致密砂岩储层。用新方法得到的结果比传统仅基于渗透率指标所构建的参数能更好地反映致密岩储层和非均质性。该方法也适用于其他类型非常规储层的非均质性评价。
Tight sandstone in outcropped Permian Shanxi Formation of the Liujiang Basin is highly heterogeneous as a result of various affecting factors,making quantitatively characterization of the feature quite a headache to parties of interest.A systematic and intensive sampling of the tight sandstone were performed and reservoir properties and relevant quantitative data were obtained through geological statistical analysis,testing and microscopic observation of thin sections.Hendrik Lorentz curves were drawn based on the analysis and the analytic hierarchy process(AHP)was also applied to determine the weights of influence factors such as permeability,porosity,surface porosity,matrix content and particle size,with a comprehensive and quantitative characterization method of the heterogeneity proposed.The study shows that the tight sandstones are highly heterogeneous with nearly identical porosity-permeability characteristics at both the vertical and lateral directions,indicating the invalidity of traditional assessment parameters such as breakthrough coefficient,variation coefficient and gradient in heterogeneity characterization due to the poor correlation between porosity and permeability.Meanwhile,the proposed method yields better results that fit well with the field observation.This method is also applicable to the description of heterogeneity of other types of unconventional reservoirs.
作者
袁红旗
邓馨雨
杜会尧
于英华
许凤鸣
YUAN Hongqi;DENG Xinyu;DU Huiyao;YU Yinghua;XU Fengming(School of Earth Science,Northeast Petroleum University,Daqing,Helongjiang 163318,China;No.1 Oil Production Plant,Daqing Oilfield Company,PetroChina,Daqing,Helongjiang 163318,China;NO.1 Oil Production Plant,Dagang Oilfield Company,PetroChina,TianJin 300280,China;Exploration Department,Daqing Oilfield Company,PetroChina,Daqing,Heilongjiang 163453,China)
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
2023年第2期468-479,共12页
Oil & Gas Geology
基金
国家自然科学基金项目(41572126)
黑龙江省自然科学基金项目(LH2022D013)
黑龙江省中央支持地方高校青年骨干人才项目(14011202101)
黑龙江省重点研发计划项目(JD22A022)。
关键词
非均质性
定量表征
洛伦兹系数
野外露头
致密砂岩
山西组
柳江盆地
heterogeneity
quantitative characterization
Lorentz coefficient
field outcrop
tight sandstone
Shanxi Formation
Liujiang Basin
