基于电成像与核磁共振测井的古龙页岩油储层有效性评价

The effectiveness evaluation of Gulong shale oil reservoirs based on the electrical imaging and NMR logging

页岩油储层的块状、层状和纹层状沉积构造是古龙页岩油储层地质评价的主要参数,而层状和纹层状页岩是优势有效储层。大庆油田古龙页岩中层状和纹层状页岩的矿物类型分为钙质和长英质,是否都是甜点有待确定。因此,利用测井资料,尤其是成像测井资料进行古龙页岩油储层精细评价是当务之急。以微电阻率扫描成像测井技术为基础,基于TechLog平台的成层性分析技术,实现古龙页岩层理面密度值定量计算及地层沉积构造判别,并结合核磁共振测井的细粒组分细化T 2谱反演技术,实现对页岩储层不同沉积构造的流体可动性精细评价,形成了基于电成像测井分析页岩沉积构造、基于核磁共振测井评价可动流体、基于岩性扫描测井分析矿物组分含量的古龙页岩储层有效性“三组合”成像测井评价技术,并确定了长英质、钙质型纹层和层状页岩储层有效性的优劣,进一步明确了页岩有效储层的沉积构造和矿物成分特征。该研究方法为古龙页岩储层新井部署、老井复查和储量计算等提供了测井技术支撑。

The massive,layered and laminated sedimentary structures of shale oil reservoirs are the main parameters in the evaluation of Gulong shale oil reservoirs,and the layered and laminated shales are the dominant and effective reservoirs of shale.The mineral types of Gulong layered and laminated shales include calcareous and felsic minerals,whether both of them are sweet spot is still unknown,so it is an urgent task for evaluating Gulong shale oil reservoirs with the help of logging data and image logging data in particular.According to the micro-resistivity scanning image logging and the stratification analysis based on TechLog platform,the quantitative calculation of bedding surface density of Golong shale and the qualitative identification of sedimentary structure have been implemented.Combined with refined logarithmic T 2 spectrum inversion technique of fine-grained component of NMR logging,the fine evaluation of shale reservoir fluid mobility in different sedimentary structures has been performed.The image logging evaluation technology of“three-combination”of Gulong shale reservoir effectiveness is finally developed,which includes the sedimentary structure analysis based on electro-imaging logging,movable fluid evaluation based on NMR logging and mineral components analysis based on litho-scaning logging,the effectiveness of felsic,calcium lamellar and layered shale reservoirs have been determined.,and the sedimentary structure and mineral composition characteristics of the effective shale reservoirs are furtherly defined.This study has provided the support of logging technology for the deployment of new wells,the review of old wells and the calculation of reserves in Gulong shale reservoirs.