本文選題：沉積環(huán)境 + 有機(jī)質(zhì)富集差異　； 參考：《礦物巖石》2017年03期

【摘要】：下寒武統(tǒng)牛蹄塘組和下志留統(tǒng)龍馬溪組是我國(guó)南方海相頁(yè)巖氣勘探的優(yōu)選層位,調(diào)查結(jié)果顯示RY1井牛蹄塘組總有機(jī)碳含量平均為4.24%,XY1井龍馬溪組總有機(jī)碳含量平均為2.08%,且中國(guó)南方牛蹄塘組總有機(jī)碳含量普遍高于龍馬溪組。為探究二者有機(jī)質(zhì)富集差異,研究基于RY1井和XY1井樣品,采用具有環(huán)境意義的礦物學(xué)和微量元素地球化學(xué)方法,對(duì)這兩套富有機(jī)質(zhì)頁(yè)巖的古氣候、古氧化還原條件、深部物源和上升洋流等沉積環(huán)境條件展開(kāi)討論。RY1井樣品Sr/Cu除去異常點(diǎn)后平均值為2.69,XY1井樣品Sr/Cu平均值為5.205,認(rèn)為牛蹄塘組形成條件更為溫濕,有利于有機(jī)質(zhì)的富集;還原條件有利于有機(jī)質(zhì)的保存,V/Cr值結(jié)果表明牛蹄塘組還原性更強(qiáng),但其有機(jī)質(zhì)的富集可能還受到其他因素影響;RY1井樣品Co/Zn平均值為0.098,XY1井樣品Co/Zn平均值為0.153,結(jié)合微量元素、鉑族元素等分析結(jié)果,認(rèn)為牛蹄塘組和龍馬溪組在形成時(shí)受深部物源的作用,且牛蹄塘組受到的作用更顯著;上升洋流將洋底的營(yíng)養(yǎng)物質(zhì)帶到陸棚環(huán)境中,提高有機(jī)質(zhì)的生產(chǎn)率,使有機(jī)質(zhì)富集,稀土元素?cái)?shù)據(jù)顯示上升洋流對(duì)牛蹄塘組作用顯著,而對(duì)龍馬溪組作用不明顯,因此有機(jī)質(zhì)富集程度不如牛蹄塘組。
[Abstract]:The Niutetang formation of the Lower Cambrian and the Longmaxi formation of the Lower Silurian are the best selected horizons for marine shale gas exploration in southern China.The results showed that the average total organic carbon content of the Niulitang formation in the RY1 well was 4.24. The average total organic carbon content of the Longmaxi formation in the XY1 well was 2.08, and the total organic carbon content of the Niulitang formation in southern China was generally higher than that of the Longmaxi formation.In order to explore the difference of enrichment of organic matter between the two wells, the paleoclimate and paleo redox conditions of these two organic shale were studied by using the mineralogical and trace element geochemical methods of environmental significance based on the samples of RY1 well and XY1 well.The sedimentary environment conditions such as deep provenance and rising ocean current are discussed. The average value of Sr/Cu in well RY1 is 5.205 after removing abnormal points. It is considered that the formation conditions of Niulitang formation are warmer and wetter, which is beneficial to the enrichment of organic matter.The reduction conditions were favorable to the preservation of organic matter and the V / Cr values showed that the reduction of organic matter was stronger in Niulitang formation, but the enrichment of organic matter might also be affected by other factors. The average value of Co/Zn of the samples of RY1 well was 0.098 XY1, the average Co/Zn of samples was 0.153, which combined with trace elements.The results of platinum group analysis show that the Niulitang formation and Longmaxi formation were affected by the deep provenance, and the Niulitang formation was affected more obviously, and the rising ocean current brought the nutrients from the ocean floor to the shelf environment.The data of rare earth elements showed that the rising ocean current played a significant role in Niulitang formation, but not in Longmaxi formation, so the enrichment degree of organic matter was lower than that of Niulitang formation.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院;中國(guó)石油化工華東油氣分公司南川頁(yè)巖氣項(xiàng)目部;
【基金】：國(guó)家自然科學(xué)基金面上項(xiàng)目“中國(guó)南方海相富有機(jī)質(zhì)頁(yè)巖孔隙特征及其對(duì)頁(yè)巖氣儲(chǔ)集與擴(kuò)散遷移的制約”(41572134)
【分類號(hào)】：P618.13

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