本文選題：生物地層 + 白云巖��； 參考：《地層學雜志》2017年01期

【摘要】：塔里木地塊寒武紀臺地相區(qū)地層白云巖是油氣勘探的主要目標之一,但是由于缺乏三葉蟲等生物化石,地層的等時劃分成為難點。雖然碳同位素曲線以及自然伽馬曲線是兩種較為有效的地層等時對比的手段,然而由于這兩種數(shù)據(jù)的獲得比較困難,限制了這些方法的廣泛應(yīng)用。通過肖爾布拉克露頭剖面巖石及鉆井方1、中深1、中深5、英買7、英買36和牙哈5等7個剖面的巖芯巖屑薄片中的所有生物化石碎片的研究,揭示了塔里木盆地寒武紀臺地區(qū)生物群落的時空分布模式。揭示的不同剖面生物群落序列具有非常好的橫向一致性,因此自下而上確定了9個具有區(qū)域地層意義的生物群落,它們分別為:1)海綿動物群落,分布于紐芬蘭統(tǒng)幸運階玉爾吐斯組底部;2)微生物-小殼生物群落,分布于紐芬蘭統(tǒng)第二階的玉爾吐斯組的頂部;3)三葉蟲群落,主要分布于第二統(tǒng)第三階的肖爾布拉克組和第四階的吾松格爾組;4)包覆狀-泡沫狀微生物群落分布于第二統(tǒng)第三階的肖爾布拉克組;5)席狀-包覆狀微生物群落,分布于第二統(tǒng)第四階的肖爾布拉克組上部;6)棘皮類-三葉蟲群落/三葉蟲-棘皮類群落,首現(xiàn)層位位于第二統(tǒng)第四階的吾松格爾組;7)棘皮類群落,主要分布于第三統(tǒng)鼓山階的阿瓦塔格組,局部上延到第三統(tǒng)古丈階的下丘里塔格組;8)微生物席群落,主要分布于第三統(tǒng)鼓山階的阿瓦塔格組中上部,局部上延到第三統(tǒng)古丈階的下丘里塔格組;9)云朵狀微生物群落,主要分布于第三統(tǒng)古丈階的下丘里塔格組,局部上延到芙蓉統(tǒng)排碧階的蓬萊壩組,下延到阿瓦塔格組。這些群落為塔里木臺地相區(qū)缺乏三葉蟲化石的白云巖"啞地層"的再劃分提供了依據(jù)。
[Abstract]:Stratigraphic dolomite in Cambrian platform facies area of Tarim block is one of the main targets of oil and gas exploration, but due to the lack of biofossils such as trilobites, isochronous stratigraphic division becomes difficult. Although carbon isotope curves and natural gamma curves are two effective methods for isochronous stratigraphic correlation, however, due to the difficulty of obtaining these two kinds of data, the wide application of these methods is limited. Through the study of all the biofossil fragments in the core cuttings of the Shaublak outcrop profile, including the rock and drilling sections 1, Zhongshen 1, Zhongshen 5, Yingmai 7, Yingmai 36 and Yaha 5, etc., The temporal and spatial distribution model of biota in Cambrian platform area of Tarim Basin is revealed. The sequence of biota revealed in different profiles has very good horizontal consistency, so nine communities of regional stratigraphic significance have been determined from the bottom up, which are respectively the community of sponges: 1). Distributed at the bottom of the Yultus formation of the lucky stage of Newfoundland (2) the microbe-shell biota, and on the top of the Yultux formation of the second order of the Newfoundland series) trilobites, Mainly distributed in the third order of the second system, Scholburak formation and the fourth order of the Usonger formation, the cladding and froth microbe communities were distributed in the third order of the second series, the Scholburak formation, and the third order of the second series, the table-shaped and the encrusted microbial communities. The acanthoderm-trilobite community / Trichoderm-echinoderm community distributed in the upper part of the Scholburak formation in the fourth order of the second series, and the first layer located in the fourth order of the second series, the Wusongger formation, 7) the acanthopanth community, the first layer of which is located in the fourth order of the second series. The Awa tag formation, which is mainly distributed in the Gushan stage of the third Series, partially extends to the Guzhang stage of the third Series, and is mainly distributed in the middle and upper parts of the Awa Tag formation of the third Gushan terrace. The cloud-like microbial community is mainly distributed in the lower Qiulitag formation of the third Paleozoic, the Pengleba formation of the Paleobitic stage of the Furong series and the Awa tag formation. These communities provide a basis for the subdivision of dolomite "dummy strata" in the Tarim platform, where there is a lack of trilobite fossils.
【作者單位】： 中國石油天然氣股份有限公司塔里木油田分公司勘探開發(fā)研究院;中國科學院油氣資源研究重點實驗室 中國科學院地質(zhì)與地球物理研究所;中國科學院大學;
【基金】：國家自然科學基金(No.41372121) 國家重點科技專項(2016ZX05004-004)共同資助
【分類號】：P534.41;Q911

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