CAJ | 학술논문

岩性识别是复杂岩性低渗透油藏高效开发中的关键地质难题，以塔南凹陷白垩系为例，探索了复杂岩性地层的测井岩性识别方法。研究区白垩系正常陆源碎屑和火山碎屑物质同时沉积，铜钵庙组发育凝灰质砂砾岩、凝灰质砂岩、沉凝灰岩、凝灰岩、砂岩、砾岩和泥岩7种岩性类型，岩性复杂，储层物性差，岩性与电性对比度低。在不同岩性地层测井响应特征研究的基础上，选择4种测井曲线进行岩性综合解释，采用Fisher判别方法达到减小同类岩性地层测井响应差异，并增大不同岩性测井响应差异的目的，建立了研究区7类岩性的判别函数，实现了非取芯井的测井岩性识别，识别正确率达到98.1%，解决了复杂岩性低渗透储层中的测井岩性识别难题，为油藏开发提供了技术支持。
암성식별시복잡암성저삼투유장고효개발중적관건지질난제，이탑남요함백성계위례，탐색료복잡암성지층적측정암성식별방법。연구구백성계정상륙원쇄설화화산쇄설물질동시침적，동발묘조발육응회질사력암、응회질사암、침응회암、응회암、사암、력암화니암7충암성류형，암성복잡，저층물성차，암성여전성대비도저。재불동암성지층측정향응특정연구적기출상，선택4충측정곡선진행암성종합해석，채용Fisher판별방법체도감소동류암성지층측정향응차이，병증대불동암성측정향응차이적목적，건립료연구구7류암성적판별함수，실현료비취심정적측정암성식별，식별정학솔체도98.1%，해결료복잡암성저삼투저층중적측정암성식별난제，위유장개발제공료기술지지。
Lithology recognition is the key geological problem in the exploitation of complex lithology low permeability reservoir. This study takes Cretaceous in Ta′nan Depression as an example to explore well logging lithology recognition method of complex lithology reservoir. Normal terrigenous clastic debris and volcanic debris deposited together in Cretaceous in Ta′nan Depression. Tuffaceous glutenite,tuffaceous sandstone,sedimentary tuff,volcanic tuff,sandstone,conglomerate and mud-stone deposited in Tongbomiao Formation in Cretaceous. It has a very complex lithology and bad petrophysics,typical of low lithology-electric property contrast. Based on the study of well logging characteristics among strata of different lithologies, four types of well logs are chosen in comprehensive lithology interpretation. Fisher discriminant analysis is used to diminish well log differences of the same type of strata and magnify well log differences of different type of strata. Discriminant functions for the seven lithology types of the study area are built to realize well log lithology recognition of wells without drilling cores. The lithology recognition validity is as high as 98.1%. The lithology recognition method built in this study resolves the problem of lithology recognition with well logs in complex lithology low permeability reservoirs and provides technical support for reservoir development.