CAJ | 학술논문

根据孔隙度、渗透率、储层品质指数(RQI)、流动层带指数(FZI)4个参数对XS1井区白垩系营城组火山岩的388个样品进行聚类分析,通过对聚类结果与各井产气情况的对比将储层流动单元划分为4类,所占比例依次为39.2%(Ⅲ类)、33.2%(Ⅱ类)、25.0%(Ⅰ类)、2.6%(Ⅳ类).Ⅰ类储层流动单元多为高孔高渗、高孔中渗和中孔高渗储层,厚度范围为10～20m;Ⅱ类储层流动单元多为中孔高渗、高孔中渗和低孔高渗储层,厚度范围为10～47m;Ⅲ类储层流动单元多为中孔高渗、中孔低渗和低孔中渗储层,厚度范围为11～86m;Ⅳ类储层流动单元为低孔低渗和特低孔特低渗储层,厚度小于10m.火山岩储层流动单元发育和分布受火山机构相带和火山岩亚相的控制,表现为火山口.近火山口相带成为Ⅰ、Ⅱ类储层流动单元的机率最大,近源相带成为Ⅱ、Ⅲ类储层流动单元的机率最大,远源相带成为Ⅲ类和Ⅳ类储层流动单元的机率最大.原生气孔发育的上部亚相和粒间孔发育的热碎屑流亚相形成Ⅰ类储层流动单元的机率最大,原生孔隙不发育的空落亚相和下部亚相形成Ⅲ类储层流动单元的机率大.实现了火山岩储层流动单元的单井识别,为其三维模型的建立提供依据.
근거공극도、삼투솔、저층품질지수(RQI)、류동층대지수(FZI)4개삼수대XS1정구백성계영성조화산암적388개양품진행취류분석,통과대취류결과여각정산기정황적대비장저층류동단원화분위4류,소점비례의차위39.2%(Ⅲ류)、33.2%(Ⅱ류)、25.0%(Ⅰ류)、2.6%(Ⅳ류).Ⅰ류저층류동단원다위고공고삼、고공중삼화중공고삼저층,후도범위위10～20m;Ⅱ류저층류동단원다위중공고삼、고공중삼화저공고삼저층,후도범위위10～47m;Ⅲ류저층류동단원다위중공고삼、중공저삼화저공중삼저층,후도범위위11～86m;Ⅳ류저층류동단원위저공저삼화특저공특저삼저층,후도소우10m.화산암저층류동단원발육화분포수화산궤구상대화화산암아상적공제,표현위화산구.근화산구상대성위Ⅰ、Ⅱ류저층류동단원적궤솔최대,근원상대성위Ⅱ、Ⅲ류저층류동단원적궤솔최대,원원상대성위Ⅲ류화Ⅳ류저층류동단원적궤솔최대.원생기공발육적상부아상화립간공발육적열쇄설류아상형성Ⅰ류저층류동단원적궤솔최대,원생공극불발육적공락아상화하부아상형성Ⅲ류저층류동단원적궤솔대.실현료화산암저층류동단원적단정식별,위기삼유모형적건립제공의거.
Volcanic reservoir flow units were classified based on four parameters, namely porosity, permeability, RQI and FZ1, using cluster analysis on 388 samples of the Cretaceous volcanic rock of Yingcheng Formation (K_1y) in the area of well XS1 in central of the Songliao Basin. The flow units can be subdivided into four classes by comparing the cluster analysis results with the gas production of corresponding wells, ranking decreasingly from type Ⅰ,Ⅱ,Ⅲ to type-Ⅳ. Frequency of different level flow units show as follows, type-Ⅲ(39.2%), type-Ⅱ (33.2%), type-Ⅰ(25.0%) and type-Ⅳ (2.6%). Type-Ⅰ, the best of the flow units is composed mainly of the volcanic reservoirs with combination of high-porosity and high-permeability, or high-porosity and medium-permeability, or medium-porosity and high-permeability, and with a thickness between 10 to 20m. Type-Ⅱ is predominantly medium-porosity and high-permeability, or high-porosity and medium-permeability, or low-porosity and high-permeability, and with a thickness varying from 10 to 47m. Type-Ⅲ is mainly medium-porosity and high-permeability, or medium-porosity and low-permeability, or low-porosity and medium-permeability, and with a thickness of ca. 11 to 86 m. Type-Ⅳ, the worst of the flow units is generally composed of low porosity and low permeability, or ultra-low porosity and ultra-low permeability reservoirs, and shows thickness less than ten meters. Characteristics and distributions of the volcanic flow units are controlled by both volcanic edifices and subfacies. It is the fact that crater-near crater facies belt have the best potential to form type-Ⅰ and type-Ⅱ flow units, while proximal facies belt type-Ⅱ and type-Ⅲ and distal facies belt type-Ⅲ and type-Ⅳ. The upper-effusive and the pyroclastics subfacies are most likely to develop flow unit of type-Ⅰ, because the former is rich in vesicle and the latter is rich in intergranular pore. Ash fall and lower-effusive subfacies are most likely to develop flow units of type-Ⅲ and type-Ⅳ, because their primary pores and fractures are generally not well developed. Description and recognition of volcanic reservoir flow units are also presented. The work provides a foundation for 3-D modeling of the volcanic reservoir flow units.