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主成分分析法在致密碎屑岩储层有效裂缝识别中的应用 被引量:13

Application of principal component analysis method to effective fracture identification of tight clastic rock reservoir
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摘要 有效裂缝识别对致密碎屑岩储层的储渗能力评价及甜点区预测至关重要。沁水盆地南部地区上古生界发育海陆过渡相致密碎屑岩储层,由于经历了复杂的构造演化及沉积作用,其岩石极为致密。基于岩心裂缝观察及测井分析结果,利用主成分分析法对致密碎屑岩储层裂缝的有效性进行分析。结果表明,沁水盆地南部地区上古生界山西组碎屑岩储层有效裂缝较为发育,与喜马拉雅期强烈的地层抬升剥蚀密切相关,多为晚期裂缝;而全充填裂缝的开度较大,多为早期裂缝。对有效裂缝敏感性较强的6种测井参数进行主成分分析,发现主成分Y1和Y2的累积方差贡献率达88.55%;根据Y1和Y2值可以进行有效裂缝的识别,并取得了较好的应用效果。利用主成分分析法识别有效裂缝,可以起到降低维度及提取裂缝有效信息的目的。 Quantitative identification of effective fractures is very important for tight clastic rock reservoir capacity and seepage ability evaluation and sweet point prediction. Tight clastic rock reservoir,belonging to marine-continent transitional facies,developed in the Upper Palaeozoic of southern Qinshui basin,which was very tight because the reservoir rock had experienced complicated tectonic evolution and sedimentation. Based on the core observation statistics and log analysis,effective fractures of tight clastic rock reservoir were identified quantitatively using principal component analysis method. Results show that the fractures of the clastic rock strata of Shanxi Formation in the Upper Palaeozoic of southern Qinshui basin are effective,the formation of which is closely related to the strong uplift and denudation of strata during Himalayan period,and they are mainly late period fractures. The opening of full filling fractures is largger,and they are mainly early period fractures. Principal components of six kinds of logging parameters which are sensitive to effective fractures were analyzed. It is found that the cumulative variance contribution ratio of the principal components of Y1 and Y2 is 88.55%. There-fore,Y1 and Y2 principal component can be used to identify the effective fractures,with good recognition effect. As a result,it can reduce the dimension and the effective information of the fracture can be extracted.
出处 《油气地质与采收率》 CAS CSCD 北大核心 2016年第6期1-7,共7页 Petroleum Geology and Recovery Efficiency
基金 国家自然科学基金项目"渤海湾盆地济阳坳陷古近系陆相富有机质页岩裂缝研究"(41372139)和"中国南方下古生界海相富有机质页岩裂缝发育程度与主控因素定量关系研究"(41072098) 国家科技重大专项"致密油有效开发机理与关键技术"(2016ZX05046-003-001)
关键词 主成分分析 致密碎屑岩储层 裂缝 有效性 测井参数 principal component analysis tight clastic rock reservoir fracture effectiveness logging parameter
作者简介 尹帅(1989-),男,山东新泰人,博士,从事石油构造分析与控油作用、非常规油气构造和裂缝及其与含气量关系研究.联系电话:13375633766,E-mail:speedysys@163.com. 通讯作者:丁文龙(1965-),男,河南南阳人,教授,博导.联系电话:18611715055,E-mail:dingwenlong2006@126.com.
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