测井方法在湖南测水煤系中的应用

测水煤系是湖南分布较广、储量丰富的含煤地层之一。对于结构简单,灰份较低的煤层,可以通过异常明显的自然伽马低异常与伽马伽马高异常加以判别。但在结构复杂、挤压破坏强烈、薄煤分层、夹矸与顶底围岩炭化程度高、煤与围岩及夹矸物性差异小等情况下,仅靠自然伽马与伽马伽马等常规测井方法难以满足测井质量验收标准。以浆江勘探区3909孔、3503孔及金竹山矿区7403孔为例,利用伽马伽马短源距、三侧向、声速及密度等测井方法,结合常规自然伽马与伽马伽马测井,较好地解决了复杂结构煤层的定性、定厚问题,取得了较好的地质效果。

Application of Well Logging in Complicated Structure Coal Seams in Ceshui Coal Measures,Hunan

The Ceshui coal measures is one of widely distributed and resource abundant coal-bearing strata in the Hunan province.In regard to simple structure and low ash content coal seams can be differentiated through low anomalous gamma-ray and high anomalous gamma-gamma data.But under conditions of complicated structure,strongly compressive destruction,thin coal slices,highly carbonized gangue and roof,floor country rocks,for small differences in physical properties between coal,country rock and gangue,only conven...