高压低渗透碎屑岩储层孔隙结构特征及分类评价——以莺歌海盆地东方A 1区黄流组一段为例  

Pore structure characteristics and classification evaluation of high-pressure and low-permeability clastic reservoir:taking the first member of Huangliu Formation in Dongfang A-1 Area of Yinggehai Basin as an example

作　　者：关耀 叶青 张冲 陈建 汤晓宇 GUAN Yao;YE Qing;ZHANG Chong;CHEN Jian;TANG Xiaoyu(Research Institute of Hainan Branch,CNOOC,Haikou,Hainan 570312,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中海石油(中国)有限公司海南分公司研究院,海南海口570312 [2]中国石油大学(北京)石油工程学院,北京102249

出　　处：《东北石油大学学报》2024年第5期75-89,I0005-I0007,共18页Journal of Northeast Petroleum University

基　　金：海南省“南海新星”科技创新人才平台项目(NHXXRCXM202368);中海油有限公司重大科研项目(KJZH-2023-2102)。

摘　　要：为揭示低渗储层的微观孔喉差异,根据岩心、测井、测试和岩心实验分析等资料,采用分形理论和多层感知器神经网络方法,分析储层孔隙结构特征,进行储层量化表征。结果表明:储层岩性以细砂岩和粉砂岩为主,受超压保护及沉积—成岩作用影响,主水道储层粒度相对较粗,原生粒间孔占比可达60%;泥质质量分数越高,粒间孔越不发育;压力因数越高,粒间孔越发育,压力因数每提高0.1,储层中粒间孔隙占比增加5%~10%。低渗储层分4种类型:Ⅰ类储层,表现为中孔、低渗特征,压汞曲线具有明显的平台段,孔喉或核磁曲线为单峰分布特征,T 2弛豫时间的主峰分布在40 ms附近,可动流体饱和度平均为53.2%;Ⅱ类储层,表现为中孔、低渗特征,孔隙度与Ⅰ类储层的相当,渗透率明显降低,压汞曲线表现一定的平台段,但进汞曲线末段斜率明显增大,孔喉或核磁曲线呈双峰分布特征,右峰T 2弛豫时间在60 ms附近,左峰的在10 ms附近;Ⅲ类和Ⅳ类储层,分别表现为中孔、特低渗和低孔、特低渗特征,压汞曲线无明显平台段,大孔喉与Ⅰ、Ⅱ类储层相比,孔喉形态更加复杂,孔喉和核磁曲线呈单峰分布,孔喉半径和T 2弛豫时间峰值逐渐向左偏移,可动流体饱和度小于20%。优选密度、中子、电阻和自然伽马参数建立基于MLP的储层类型测井识别方法,储层识别正确率达86.7%,与岩心实验分析吻合率达88.9%,产能匹配性较好。该结果可为研究区低渗气藏的有效开发提供依据。To further reveal the microscopic pore-throat differences in low-permeability reservoirs,based on the data of core,logging,testing and core experimental analysis,we used fractal theory and multi-layer perceptron neural network method to comprehensively analyze the pore structure characteristics of the reservoir and study the quantitative characterization of the reservoir.The results show that the lithology of the reservoir is dominated by fine sandstone and siltstone,which is affected by overpressure protection and sedimentation and rock-forming effect,the grain size of the main watercourse reservoir is relatively coarse,and the proportion of primary intergranular pores can be up to 60%.The higher the quality fraction of mud mass,the more underdeveloped the intergranular pores are;the higher the pressure factor is,the more intergranular pores are developed.For every increase of 0.1 in the pressure factor,the proportion of intergranular pores in the reservoir can be increased by 5%10%.The low-permeability reservoirs are divided into four types:typeⅠreservoirs are characterized by mesoporous and low-permeability features,the pressure mercury curve has an obvious platform section,the pore throat or NMR curve is characterized by a single-peak distribution,the main peak of the T 2 relaxation time is distributed in the vicinity of 40 ms,and the saturation degree of movable fluid is 53.2%on average;typeⅡreservoirs are characterized by mesoporous and low-permeability features,with comparable porosity to typeⅠreservoirs and significantly lower permeability,the pressure mercury curve shows a certain platform section,but the slope of the last section of the mercury curve increases significantly,the pore throat or NMR curve shows a bimodal distribution,with the T 2 relaxation time of the right peak near 60 ms and that of the left peak near 10 ms;typeⅢand typeⅣreservoirs show the characteristics of medium-porosity,extra-low seepage,and low porosity and extra-low seepage,respectively.There is no obvious platform sect

关 键 词：低渗碎屑岩储层 孔隙结构特征 分类评价 东方区 黄流组 莺歌海盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]