本文關(guān)鍵詞： 焦石壩 五峰組-龍馬溪組 頁(yè)巖 硅質(zhì)生物成因 地質(zhì)意義　出處：《中國(guó)石油大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年01期 　論文類型：期刊論文

【摘要】：以頁(yè)巖露頭樣品和鉆井巖屑樣品元素測(cè)量結(jié)果為依據(jù),結(jié)合巖心和薄片觀察,分析焦石壩五峰組-龍馬溪組頁(yè)巖的硅質(zhì)生物成因的證據(jù),并探討其地質(zhì)意義。結(jié)果表明:焦石壩五峰組—龍馬溪組頁(yè)巖中存在大量的筆石、角石、珊瑚等古生物化石和放射蟲(chóng)微體生物化石;SiO_2含量介于40%~80%,平均達(dá)63%;過(guò)量硅含量為2.6%~55.31%,其中五峰組和龍馬溪組頁(yè)巖下段過(guò)量硅含量較高,平均分別為41.3%和25.5%;Al/(Al+Fe+Mn)值介于0.62~0.87,與純生物成因硅質(zhì)巖相近,Al-Fe-Mn三角圖上,研究區(qū)頁(yè)巖樣品絕大部分落在生物成因區(qū),表明頁(yè)巖硅質(zhì)成分屬于生物成因;深水陸棚貧氧、缺氧沉積環(huán)境有利于頁(yè)巖有機(jī)質(zhì)的富集和有機(jī)孔隙的發(fā)育,對(duì)于頁(yè)巖天然裂縫的形成和后期人工壓裂都具有重要意義。
[Abstract]:Based on the element measurement results of shale outcrop and drilling cuttings, combined with core and thin slice observation, the evidence of siliceous biogenesis of Jiaoshiba Wufeng formation and Longmaxi formation is analyzed. The results show that the shale of Jiaoshiba Wufeng formation and Longmaxi formation contains a lot of fossils such as graptolite, hornstone, coral and radiolarian microfossils. The content of SiO_2 was between 40 and 80, with an average of 63. The excess silicon content is 2.6X 55.31, of which the excess silicon content in the lower shale of Wufeng formation and Longmaxi formation is higher, with an average of 41.3% and 25.5, respectively. The value of Al/(Al Fe mn is between 0.62 and 0.87, which is close to that of pure biogenic siliceous rocks on the Al-Fe-Mn triangulation diagram. Most of the shale samples in the study area fall in the biogenic area. The results show that the siliceous composition of shale belongs to biological origin. The oxygen-poor environment in deep water shelf and anoxic sedimentary environment are conducive to the enrichment of organic matter and the development of organic pores. It is of great significance for the formation of natural fractures and artificial fracturing of shale.
【作者單位】： 頁(yè)巖油氣富集機(jī)理與有效開(kāi)發(fā)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中石化石油工程技術(shù)研究院;
【基金】：中國(guó)石化重點(diǎn)科技攻關(guān)項(xiàng)目(P13012)
【分類號(hào)】：P618.13

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