综述某矿区煤炭地质勘查中含煤岩系沉积演化特征分析
综述某矿区煤炭地质勘查中含煤岩系沉积演化特征分析
摘要：在大型陆相盆地边部聚煤环境比较复杂的新区（井田）进行深部煤层对比，往往采用某一种方法是难以准确确定煤层层位和构造形态的，需要应用多种对比方法进行综合分析和相互验证，才能取得可靠的对比结果。按照先对比含煤段，后对比煤层的顺序，以标志层对比和层间距对比为主，沉积旋回、煤层、测井曲线组合、优势分析方法对比佐证的对比方法，对普查区主要煤层进行多重对比研究，取得了较好的地质效果，为该区由普查直接转入勘探阶段提供了可靠的地质依据。
关键词：煤炭地质；煤层对比；含煤岩系；演化特征
Abstract: The large continental basin edge poly coal complex New Area (Ida) deep coal seams comparison, often using a particular method is difficult to accurately determine the the coal stratigraphic and structural form, and require the application of a variety of contrast methods comprehensiveanalysis and mutual authentication, in order to obtain a reliable comparison of results. Sedimentary cycle, coal seam, a portfolio of well logs, advantages of analytical methods in accordance with the first comparing the order of the coal-bearing segment, after contrast seam to the the flag layer of contrast and layer spacing compared contrast corroboration contrast, census main seam multiple comparative study, good geological effect, provide a reliable geological basis for the area by the census directly transferred to the exploration stage.Key words: coal geology; coal seam correlation; coal-bearing strata; evolution characteristics
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一、含煤岩系沉积演化特征
普查区含煤地层为延安组，埋深430～1350m。依据岩性、岩相、旋回结构和含煤性的差异，结合区域地质资料，延安组自下而上可分为三段：
①延安组一段（J2y1）。底部为残积相铝质泥岩或铝质粉砂岩，含植物根茎化石，分布局限。下部由河床相中粒砂岩、河漫滩相砂质泥岩、泛滥平原沼泽亚相炭质泥岩夹煤层组成。
②延安组二段（J2y2）。由分流河道相含砾中粗粒石英砂岩、废弃河道相粉砂岩、砂质泥岩、泛滥平原沼泽相炭质泥岩和薄煤层组成多个旋回式韵律层，冲刷侵蚀构造发育，厚度6.11～88.23m，平均43.26m。含煤1～3层，编号分别是2-1、2-2、2-3，煤层结构简单-较简单。
③延安组三段（J2y3）。主要由中粗粒砂岩与灰色砂质泥岩、粉砂岩和细粒砂岩组成，偶夹炭质泥岩和煤线，顶部发育紫杂色铝质泥岩，厚度23.54～41.18m，平均32.36m。受后期风化剥蚀而残缺不全，分布局限。
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