【摘要】：依據(jù)鉆孔巖芯及測(cè)井曲線資料對(duì)鄂爾多斯盆地東部晚三疊世瓦窯堡組沉積相、聚煤模式、層序地層格架、巖相古地理進(jìn)行研究,提出該區(qū)聚煤規(guī)律。瓦窯堡組依據(jù)巖性共分為五段,其中底部的第1段和頂部的第5段以泥巖、粉砂巖為主,第2段、第3段、第4段下部以砂巖為主,上部以泥巖、粉砂巖為主。根據(jù)瓦窯堡組頂部區(qū)域不整合面、第1段、第3段以及第4段底部河流下切谷沖刷面、瓦窯堡組底部與其下伏地層間地層顏色及巖性突變面等層序界面,將瓦窯堡組劃分為3個(gè)三級(jí)層序,其中層序I對(duì)應(yīng)瓦窯堡組一段和二段,層序Ⅱ?qū)?yīng)瓦窯堡組三段,層序Ⅲ對(duì)應(yīng)瓦窯堡組四段和五段。通過統(tǒng)計(jì)各個(gè)三級(jí)層序內(nèi)的巖性數(shù)據(jù),繪制地層厚度、砂泥比、煤層厚度等值線圖,以三級(jí)層序?yàn)樽鲌D單元,恢復(fù)各層序的古地理格局,主要的古地理單元為河流、三角洲和湖泊,物源位于研究區(qū)東北部。層序Ⅲ的聚煤作用明顯優(yōu)于層序Ⅰ和層序Ⅱ,最有利于成煤環(huán)境為三角洲平原分流間灣,聚煤中心大致位于石灣鎮(zhèn)—玉家灣鎮(zhèn)—安塞縣一帶。
[Abstract]:The sedimentary facies, coal accumulation model, sequence stratigraphic framework and lithofacies paleogeography of the Wayaobu formation of the late Triassic in the eastern part of Ordos Basin are studied based on the data of borehole core and logging curve. The Wayaobu formation is divided into five sections according to lithology, in which the first section at the bottom and the fifth section at the top are dominated by mudstone and siltstone, the second, the third and the fourth are dominated by sandstone, and the upper by mudstone and siltstone. According to the unconformities at the top of the Wayaobu formation, the first, the third and the fourth member bottom of the fluvial valley scouring surface, and the sequence interface between the bottom of the Wayaobu formation and its underlying strata, such as the abrupt change surface of formation color and lithology, etc. The Wayaobu formation is divided into three third-order sequences, in which sequence I corresponds to the first and second member of the Wayaobu formation, sequence 鈪，

本文編號(hào)：2320396