摘要
火山岩岩性识别是岩相划分、储层综合评价、井网部署、开发方案编制的基础。而火山岩岩石类型多,定名和识别难度大,ECS测井通过解谱和氧化物闭合模型得到地层中主要造岩元素的相对百分含量和矿物含量,从岩石成分的角度较好地解决了火山岩岩性识别的问题。研究区研究结果表明从基性玄武岩到酸性流纹岩,Si和40K元素含量增大,Al和Fe元素含量则减小;熔结凝灰岩的Gd元素含量比熔岩高;常规测井的GR与ECS测井的Si元素含量正相关,地层密度与Fe元素含量正相关,能谱测井的Th元素含量则与Fe元素含量负相关。因此,将ECS与常规测井、成像测井相结合,是解决火山岩岩性识别难的有效途径。
Llithologic identification of the volcanics is the base of rock phase dividing, synthetical reservoir evaluation and prognostication, pattern arrangement, development plan preparing. Because the type of igneous rock is more, it is very difficult to name and identify. ECS log can abtain the percentage of the main rock elements and minerals in formation by spectrum interpretation and oxide close mode. It solves the problem of lithologic identification by the angle of rock component. In the study area, silicon dioxide is the main igneous mineral. The second is aluminium dioxide, potassium dioxide, odium dioxide and iron dioxide. Calcium dioxide and magnesium dioxide are very little. So, Si, Al, Fe and Gd are the main indicator elements in lithologic identification. The study result shows that Si and K40 contents in igneous rock raise, but Al and Fe contents reduce when rock changes from basalt to rhyolite. Simultaneously, the content of Gd in tuff rock is higher than that in lava. GR in routine log is direct ratio with the content of Si in ECS. The density of formation is positive ratio with the content of Fe in ECS, too, but the content of Th in gamma spectrometry log is negative ratio with the content of Fe in ECS. So, it is an effective way of lithologic identification to combine ECS with routine log and image log.
出处
《断块油气田》
CAS
2006年第3期86-88,共3页
Fault-Block Oil & Gas Field
关键词
ECS测井
火山岩
常规测井
岩性识别
应用
ECS Log, Volcanics, Routine Logging, Lithologic identification, Application.
