本文選題：鄂爾多斯盆地 + 延長組段　； 參考：《海相油氣地質(zhì)》2017年02期

【摘要】：系統(tǒng)采集了鄂爾多斯盆地西南部地區(qū)延長組8段瀝青砂巖,對砂巖瀝青的地球化學(xué)特征進(jìn)行了研究,探討了瀝青的母質(zhì)特征、形成環(huán)境和成熟度。研究結(jié)果表明:(1)長8段砂巖瀝青中高碳數(shù)的正構(gòu)烷烴優(yōu)勢明顯,規(guī)則甾烷中C_(29)含量相對較高,萜烷系列中四環(huán)萜烷含量較高,C_(24)四環(huán)萜烷/(C_(24)四環(huán)萜烷+C_(26)三環(huán)萜烷)的值為0.26~0.52,C_(23)三環(huán)萜烷/(C_(23)三環(huán)萜烷+C_(30)藿烷)的值分布范圍為0.06~0.41,這些都指示研究區(qū)長8段砂巖瀝青母質(zhì)來源為混合型,并且陸源有機(jī)質(zhì)貢獻(xiàn)較大;(2)砂巖瀝青中Pr/Ph為0.67~1.07,同時,瀝青中檢測出低豐度的β胡蘿卜烷,說明瀝青形成環(huán)境為弱氧化—弱還原環(huán)境,較低豐度的伽馬蠟烷與C_(30)+藿烷指示瀝青的母質(zhì)形成于淡水或微咸水湖泊環(huán)境;(3)長8段砂巖瀝青的C31藿烷22S/(22S+22R)、C_(29)甾烷20S/(20S+20R)、C_(29)甾烷ββ/(αα+ββ)和C_(29)重排甾烷20S/(20S+20R)均接近或已經(jīng)達(dá)到平衡值,反映瀝青為成熟瀝青。將研究結(jié)果與已報道潛在烴源巖的生物標(biāo)志化合物特征進(jìn)行對比,顯示出研究區(qū)長8段砂巖瀝青主要來源于延長組7段烴源巖,表明長7段烴源巖是研究區(qū)最主要的烴源巖之一。
[Abstract]:The 8 member bituminous sandstone of Yanchang formation in southwestern Ordos Basin is collected systematically. The geochemical characteristics of sandstone bitumen are studied and the parent material characteristics of bitumen are discussed and the forming environment and maturity are discussed. The results show that the n-alkanes with high carbon number in 8 member sandstone bitumen have obvious superiority, and C _ S _ (29) in regular steranes is relatively high. Higher content of tetracyclic terpenes in the terpene series (CST24) Tetracyclic terpene / hackenane (C26) tricyclic terpene)) the value of the terpene series is 0.260.52% C23C)) the distribution range of the tricyclic terpene C _ (30) is 0.066 ~ (0.41), which indicates that the sandstone leachate of the Chang 8 member of the study area is located in the Chang 8 member of the study area. The distribution range of the value of the terpene is 0.066 ~ (0.41), indicating that the sandstones of the Chang 8 member of the study area are leachate. The source of green parent material is mixed type. The Pr/Ph in sandstone asphalt is 0.671.07, and 尾 -daucothane with low abundance is detected in the asphalt, which indicates that the bitumen formation environment is weak oxidation-weak reduction environment. The lower abundance gamma-waxane and Cash-30) hopane indicate that the bitumen parent material was formed in the freshwater or brackish water lake environment / 3) the C31 cariane 22S/(22S 22R ~ + C ~ (29) sterane 20S/(20S _ (20R / C ~ + C ~ + C ~ (29)) sterane 尾 -beta (偽 偽 尾 尾 and C _ (29)) rearranged sterane 20S/(20S _ (20R) are close to or have reached the equilibrium value, and the rearrangement of sterane 尾 尾 (偽 偽 尾 尾) and C _ (29) sterane 20S/(20S _ (20R) are close to or have reached the equilibrium value. Reflects the asphalt as a mature asphalt. Comparing the results with the biomarker characteristics of the reported potential source rocks, it is shown that the sandstone bitumen of the Chang 8 formation is mainly derived from the source rocks of the 7th member of the Yanchang formation. It shows that the source rock of Chang 7 member is one of the most important source rocks in the study area.
【作者單位】： 中國石油化工股份有限公司江漢油田分公司;中國科學(xué)院地質(zhì)與地球物理研究所蘭州油氣資源研究中心/中國科學(xué)院油氣資源研究重點(diǎn)實驗室;中國科學(xué)院大學(xué);長江大學(xué)湖北省非常規(guī)油氣協(xié)同創(chuàng)新研究中心;
【分類號】：P618.13
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本文編號：1796714