深层缝洞型碳酸盐岩储层定量分类与评价——以四川盆地安岳气田灯影组四段储层为例  

Quantitative classification and evaluation on deep fractured-vuggy carbonate reservoirs:An example of Dengying 4 Member,Anyue gasfield,Sichuan Basin

作　　者：徐诗雨 林怡 杨帆[1] 陈文[1] 杨京 何开来 曾乙洋 黎洋 赵春妮[1] Xu Shiyu;Lin Yi;Yang Fan;Chen Wen;Yang Jing;He Kailai;Zeng Yiyang;Li Yang;Zhao Chunni(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sich­uan 610041,China)

机构地区：[1]中国石油西南油气田公司勘探开发研究院

出　　处：《天然气勘探与开发》2021年第2期1-10,共10页Natural Gas Exploration and Development

摘　　要：储层分类评价是对气藏储量品位进行地质综合评判的重要环节,是提交天然气探明储量的一项必要研究内容。目前,权重分析法、灰色关联法、聚类分析法等多种方法和技术的广泛应用,使储层分类评价从定性、单一化逐步向定量、综合化发展。深层缝洞型碳酸盐岩储集空间类型多样、孔喉结构复杂、储层非均质性强,为解决目前储层分类评价结果的多解性、模糊性、主观性等问题,以四川盆地安岳气田上震旦统灯影组四段储层为例,基于储层地质特征及主控因素的认识,优选孔隙度、渗透率、渗透率变异系数、泥质含量、含水饱和度、储层厚度等6个参数,进行储层定量分类评价。研究结果表明:①安岳气田灯影组四段储层可利用对应分析法直观地划分为Ⅰ、Ⅱ、Ⅲ、Ⅳ四大类;②储层定量分类评价结果与单井实测产能符合率高,研究区内储层以Ⅱ、Ⅲ类储层为主;③储层品质平面展布与区内构造特征、地震预测厚度、有利沉积相展布特征吻合,该分类评价结果可以为后续勘探开发提供依据。For gas reservoirs,their classification and evaluation is not only an important part of comprehensive geological judgement on the quality,but also an essential research content for reporting proven natural-gas reserves.At present,wide application of several methods and technologies such as weight analysis,gray correlation,and cluster analysis,has gradually promoted this classification and evaluation from qualitative and simple to quantitative and complex.Because deep fractured-vuggy carbonate reservoirs are characterized by different reservoir space,complex pore-throat structure,and strong heterogeneity,it is easy to get multi-solvable,ambiguous,and subjective classification and evaluation results.So,Dengying 4 reservoirs in the Upper Sinian Dengying Formation,Anyue gasfield,Sichuan Basin,were taken as objectives.And on the basis of geological understanding,they were classified and evaluated from 6 factors including porosity,permeability,variation coefficient of permeability,shale content,water saturation and reservoir thickness.Results show that,(1)in Dengying 4 Member,Anyue gasfield,there are four reservoir types subdivided by correspondence analysis,including typeⅠ,typeⅡ,typeⅢ,and typeⅣ;(2)the results from quantitative classification and evaluation are in good agreement with a real single-well productivity,and primarily typeⅡand typeⅢreservoirs are dominated in the study area;and(3)the planar distribution of the reservoir quality is consistent with the structures,the reservoir thickness predicted by seismic interpretation,and the distribution of favorable sedimentary facies in the study area.All results may provide an evidence for following exploration and development.

关 键 词：安岳气田 深层缝洞型储层 碳酸盐岩 定量分类评价 对应分析 贝叶斯判别分析 平面展布 

分 类 号：P618.13[天文地球—矿床学]