基于测井反演的CT扫描煤储层特征评价——以大宁-吉县区块为例

Reservoir feature evaluation based on conventional methods and holographic digital core description Taking the Daning Jixian block as an example

针对大宁-吉县区块煤岩发育特征,通过CT扫描与常规测井手段相结合,采用反演煤岩虚拟灰度剖面和岩心CT扫描煤层结构精细划分煤层技术,建立3条煤岩组分曲线:镜质组含量、壳质组+惰质组含量、矿物含量,划分夹矸和宏观煤岩类型,计算煤岩段有机质丰度和确定煤层结构类型。煤岩灰度剖面定量出煤层段具体的宏观煤岩组分含量,有效实现单井煤层有机质丰度评价,结合薄夹矸和有机质丰度分布,可有效为压裂选段提供优化指导。

Based on the development characteristics of coal and rock in the Daning Jixian block,a combination of CT scanning and conventional logging techniques was used to invert the virtual gray scale profile of coal and rock andfine classify the coal seam structure using core CT scanning.Three coal and rock composition curves were established:vitrinite content,crust+inertinite content,mineral content,classification of gangue and macroscopic coal and rock types,calculation of organic matter abundance in coal and rock sections,and determination of coal seam structure types.Quantitative determination of the specific macroscopic coal rock component content in coal seam sections using the gray scale profile of coal rock effectively achieves the evaluation of organic matter abundance in single well coal seams.Combined with the distribution of thin gangue and organic matter abundance,it can effectively provide optimization guidance for fracturing section selection.