BIOSTRATIGRAPHIC DIVISION AND REGIONAL CORRELATION OF WUFENG FORMATION AND LONGMAXI FORMATION IN JINKECUN SECTION, SOUTHWESTERN MARGIN OF SICHUAN BASIN
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摘要:
为了探究上扬子海盆在奥陶纪-志留纪之交的沉积环境、明确四川盆地西南缘金坷村筠连地区有机质页岩沉积层位，通过对金坷村剖面五峰组-龙马溪组岩石地层及生物地层的研究，识别出自晚奥陶世凯迪阶WF2带至早志留世埃隆阶LM6带的9个连续生物带及组合.认为金坷村地区是上扬子海盆最早进入前陆期的地区，时间为鲁丹阶LM1期.金坷村剖面与其北部的新地2井、宁211井、威202井生物地层对比发现，自南向北黑色页岩笔石带上限自LM6延伸至LM9，呈逐渐增高的趋势.金坷村剖面富有机质页岩层位于WF2-LM4带，厚度20.6 m，为该地区页岩气勘探开发提供了一定的基础资料.
Abstract:To explore the sedimentary environment of Upper Yangtze Basin at the turn of Ordovician-Silurian period and determine the sedimentary horizon of organic shale in Junlian area on the southwestern margin of Sichuan Basin, nine continuous biozones and combinations from Late Ordovician Katian WF2 zone to Early Silurian Aeronian LM6 zone are identified based on the study of lithostratigraphy and biostratigraphy of Wufeng Formation-Longmaxi Formation in Jinkecun section. It is believed that Jinkecun area is the first to enter the foreland period in the Upper Yangtze Basin, in the time of Rhuddanian LM1 stage. The biostratigraphic correlation between Jinkecun section and XD-2, N-211 and W-202 wells on the north indicates that the upper limit of black shale graptolite zone extends from LM6 to LM9 from south to north, showing a gradually increasing trend. The organic-rich shale in Jinkcun section is located in WF2-LM4 zones with a thickness of 20.6 m, which provides basic data for shale gas exploration and development in the area.
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表 1 区域生物地层划分、沉积厚度及TOC含量对比
Table 1. Regional comparison of biostratigraphy, sedimentary thickness and TOC content
系 统 阶 笔石带 沉积时间/Ma 金坷村剖面（本文） 盐津1井[17] 长宁211井[18] 新地2井[15] 自201井[19] 威202井[20] 沉积厚度/m TOC/% 沉积厚度/m TOC/% 沉积厚度/m TOC/% 沉积厚度/m TOC/% 沉积厚度/m TOC/% 沉积厚度/m TOC/% 志留系 兰多维列统 埃隆阶 LM9 > 25 > 6？ LM8 0.27 33.16 0.55 52.99 0.74 5.64 5.16 2.10 LM7 0.45 > 140 38.57 0.86 40.65 1.31 6.53 4.29 LM6 1.56 1.91 53.50 61.71 1.42 36.53 2.76 3.53 10.52 3.70 鲁丹阶 LM5 0.8 6.80 1.83 12.93 13.53 1.48 2.10 3.94 1.03 5.74 3.30 LM4 0.9 2.00 5.99 12.44 10.24 4.50 9.20 5.85 3.30 4.45 4.90 LM3 0.93 1.20 6.06 4.99 4.25 12.40 3.79 5.14 LM2 0.43 6.00 4.13 3.69 奥陶系 上奥陶统 赫南特阶 LM1 0.6 2.71 6.80 1.07 6.16（？） WF4 0.73 0.40 1.83 0.35 2.63 5.59 9.66 3.51 7.70 7.81 凯迪阶 WF3 1.86 9.40 2.48 8.09 2.32 3.00 WF2 0.6 1.60 2.27 3.51 2.56 0.84 2.10 
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