RMT测井仪在某些油田的初步应用

Some Applications of RMT in Some China Oilfields

脉冲中子测井是目前在套管井中评价储层含油饱和度的方法之一。RMT是国外同类仪器中晶体效率最高且尺寸最大的双源距脉冲中子综合测井仪 ,测井曲线统计性较好。RMT具有 3种测量模式 ,在C O模式下 ,仪器不但提供C O、Ca Si以及H、Si、Ca、K、Cl、Fe、S、Ti、Mg等元素伽马射线产额 ,同时还提供地层俘获截面、孔隙度指数和氧活化、硅活化计数。该仪器已经在松辽盆地、渤海湾地区和西部油田测井 3 0 0多口 ,在深井和较低孔隙度储层中也获得了较好的效果。简要介绍了RMT ,并展示了该仪器在判断岩性、指示产层出砂、识别含气层位、反映层内水淹差异、识别油水界面、确定堵水层位和再挖潜老井等方面的一些应用实例。

Pulsed-neutron logging is the most effective means for the time being to evaluate oil and water saturations in cased wells. RMT is a pulsed-neutron spectrometry tool that employs two high-performance BGO detectors, which ensure good statistical properties of its logging curves. There are three operating modes for the tool. With C/O mode, it can provide curves of C/O and Ca/Si, elemental yields, ∑, oxygen and silicon activations and porosity index. After being imported into China, the tool has been applied widely in some oilfields in the Songliao basin, the Bohai bay and the western area . It even offered good results in deep wells and in lower-porosity reservoirs. Some applications, as ldentifying lithologies, idicating sand productions, identifying gas-bearing formations, revealing difference of water-flooding extent in different intervals of the same formation, identifying formation fluid contacts, determining water-flooded intervals to be blocked, and re-evaluating potential formations in old wells, are exhibited here.