本文關(guān)鍵詞： 四川盆地 龍馬溪組 富有機質(zhì)頁巖 地球化學指標　出處：《大慶石油地質(zhì)與開發(fā)》2016年02期 　論文類型：期刊論文

【摘要】：四川盆地龍馬溪組富有機質(zhì)頁巖是重要的烴源巖和頁巖氣儲層。為了明確富有機質(zhì)頁巖形成控制因素,采用多種地球化學指標分析其沉積時的氧化還原條件、古生產(chǎn)力條件和陸源碎屑供給情況。結(jié)果表明:龍馬溪組頁巖具有高的有機碳含量,龍馬溪組下部硅質(zhì)頁巖形成于貧氧環(huán)境,龍馬溪組上部粉砂質(zhì)頁巖和黏土質(zhì)頁巖形成于氧化環(huán)境,由下至上還原環(huán)境逐漸遭受破壞;龍馬溪組沉積時期古生產(chǎn)力為中—高等,下部硅質(zhì)頁巖段陸源供給較少,中部粉砂質(zhì)頁巖段陸源碎屑供給相對多,粗碎屑顆粒含量相對高,上部黏土質(zhì)頁巖以陸源黏土礦物為主;龍馬溪組沉積物中埋藏有機碳含量與氧化還原環(huán)境指標、古生產(chǎn)力指標呈良好的相關(guān)性,與陸源碎屑供給參數(shù)相關(guān)性較差。龍馬溪組富有機質(zhì)頁巖的形成主要受控于氧化還原條件和古生產(chǎn)力。
[Abstract]:The organic shale of Longmaxi formation in Sichuan Basin is an important source rock and shale gas reservoir. In order to determine the controlling factors of the formation of organic matter rich shale, various geochemical indexes are used to analyze the redox conditions during the deposition. The results show that the shale of Longmaxi formation has high organic carbon content, and the siliceous shale in the lower part of Longmaxi formation is formed in oxygen-poor environment. The silty shale and clay shale in the upper part of Longmaxi formation were formed in the oxidizing environment and gradually destroyed from the bottom to the upper reducing environment, the paleoproductivity of Longmaxi formation was medium to high during the sedimentary period, and the terrestrial supply of the lower siliceous shale formation was less. In the middle part of silty shale, there is a relatively large supply of terrigenous clastic materials, a relatively high content of coarse clastic grains, and the upper clay shale is dominated by terrestrial clay minerals, while the buried organic carbon content and the redox environmental indexes in the sediments of Longmaxi formation are the main ones. There is a good correlation between paleoproductivity index and terrestrial clastic supply parameters. The formation of organic matter rich shale in Longmaxi formation is mainly controlled by redox conditions and paleoproductivity.
【作者單位】： 中國石油大學地球科學學院;
【基金】：中國石化科技攻關(guān)項目“川東地區(qū)龍馬溪組頁巖氣富集規(guī)律與分布預測”(G5800-14-ZS-KJB158)
【分類號】：P618.13
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本文編號：1534143