綜述某礦區(qū)煤炭地質(zhì)勘查中含煤巖系沉積演化特征分析
綜述某礦區(qū)煤炭地質(zhì)勘查中含煤巖系沉積演化特征分析
摘要：在大型陸相盆地邊部聚煤環(huán)境比較復(fù)雜的新區(qū)（井田）進(jìn)行深部煤層對比，往往采用某一種方法是難以準(zhǔn)確確定煤層層位和構(gòu)造形態(tài)的，需要應(yīng)用多種對比方法進(jìn)行綜合分析和相互驗(yàn)證，才能取得可靠的對比結(jié)果。按照先對比含煤段，后對比煤層的順序，以標(biāo)志層對比和層間距對比為主，沉積旋回、煤層、測井曲線組合、優(yōu)勢分析方法對比佐證的對比方法，對普查區(qū)主要煤層進(jìn)行多重對比研究，取得了較好的地質(zhì)效果，為該區(qū)由普查直接轉(zhuǎn)入勘探階段提供了可靠的地質(zhì)依據(jù)。
關(guān)鍵詞：煤炭地質(zhì)；煤層對比；含煤巖系；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、含煤巖系沉積演化特征
普查區(qū)含煤地層為延安組，埋深430～1350m。依據(jù)巖性、巖相、旋回結(jié)構(gòu)和含煤性的差異，結(jié)合區(qū)域地質(zhì)資料，延安組自下而上可分為三段：
①延安組一段（J2y1）。底部為殘積相鋁質(zhì)泥巖或鋁質(zhì)粉砂巖，含植物根莖化石，分布局限。下部由河床相中粒砂巖、河漫灘相砂質(zhì)泥巖、泛濫平原沼澤亞相炭質(zhì)泥巖夾煤層組成。
②延安組二段（J2y2）。由分流河道相含礫中粗粒石英砂巖、廢棄河道相粉砂巖、砂質(zhì)泥巖、泛濫平原沼澤相炭質(zhì)泥巖和薄煤層組成多個(gè)旋回式韻律層，沖刷侵蝕構(gòu)造發(fā)育，厚度6.11～88.23m，平均43.26m。含煤1～3層，編號分別是2-1、2-2、2-3，煤層結(jié)構(gòu)簡單-較簡單。
③延安組三段（J2y3）。主要由中粗粒砂巖與灰色砂質(zhì)泥巖、粉砂巖和細(xì)粒砂巖組成，偶夾炭質(zhì)泥巖和煤線，頂部發(fā)育紫雜色鋁質(zhì)泥巖，厚度23.54～41.18m，平均32.36m。受后期風(fēng)化剝蝕而殘缺不全，分布局限。
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