藏北羌塘盆地井下布曲組含油白云巖地球化學(xué)特征及其意義
本文關(guān)鍵詞: 生物標(biāo)志化合物 含油白云巖 布曲組 油-巖對(duì)比 羌塘盆地 出處:《地質(zhì)通報(bào)》2017年04期 論文類型:期刊論文
【摘要】:羌資11、12井是羌塘盆地揭示隆鄂尼-昂達(dá)爾錯(cuò)古油藏展布規(guī)律的資料井。對(duì)這2口鉆井揭示的含油巖層進(jìn)行取樣分析,結(jié)合前人該區(qū)石油地質(zhì)調(diào)查報(bào)告中羌資2井布曲組、夏里組及曲色組烴源巖的分析數(shù)據(jù),從類異戊二烯烴、甾烷、萜烷等系列生物標(biāo)志化合物參數(shù)方面進(jìn)行油-巖對(duì)比研究。研究表明,羌資11、12井揭示的原油為同一種類型,但11井原油生物降解程度強(qiáng)于12井。各原油的母質(zhì)主要來(lái)源于低等水生生物和藻類;各原油的母質(zhì)形成于還原-弱還原、鹽度值不高的咸水環(huán)境。原油中類異戊二烯烴、萜烷、甾烷等生物標(biāo)志化合物參數(shù)與羌資2井布曲組泥晶灰?guī)r與夏里組和曲色組烴源巖之間具有較好的親緣性。結(jié)合南羌塘地區(qū)烴源巖有機(jī)碳資料,油源可能主要來(lái)自于曲色組,混入了部分夏里組及布曲組的油源,具有混源的特征。該研究結(jié)果對(duì)下一步油氣勘探具有一定的指導(dǎo)意義。
[Abstract]:Qiangzi 11yun12 well is a data well in Qiangtang Basin to reveal the distribution law of Long-Ondaho ancient reservoir. The oil-bearing strata revealed by these two drilling wells are sampled and analyzed. Based on the analysis data of source rocks of Qiangzi 2 well Buqu formation, Xiali formation and Kochsia formation in the previous petroleum geological survey in this area, isoprene hydrocarbon and sterane were analyzed from the source rocks. The oil-rock correlation study on the parameters of series of biomarkers such as terpene alkanes shows that the crude oil revealed in Qiangzi 11yun12 well is of the same type. However, the biodegradation of crude oil in well 11 is stronger than that in well 12. The source material of each crude oil is mainly from low aquatic organisms and algae. The parent material of each crude oil is formed in the saltwater environment of reduction-weak reduction and low salinity. Isoprene hydrocarbon and terpene in crude oil. The parameters of sterane and other biomarkers are closely related to the mudstone of Qiangzi 2 well Buqu formation and the source rocks of Xiali formation and qu color formation. The organic carbon data of source rocks in South Qiangtang area are combined. The oil source may mainly come from the curved color formation, mixed with some oil sources of Xiali formation and Buqu formation, and has the characteristics of mixed source. The results of this study are of certain guiding significance for oil and gas exploration in the next step.
【作者單位】: 中國(guó)地質(zhì)大學(xué)(武漢)地球科學(xué)學(xué)院;中國(guó)地質(zhì)科學(xué)院;中國(guó)地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心沉積地質(zhì)研究室;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目《羌塘盆地海相油頁(yè)巖:沉積環(huán)境、古氣候及源區(qū)》(批準(zhǔn)號(hào):41172098) 中國(guó)地質(zhì)調(diào)查局項(xiàng)目《羌塘盆地金星湖—隆鄂尼地區(qū)油氣資源調(diào)查》(編號(hào):DD20160159)
【分類號(hào)】:P618.13
【正文快照】: 1.中國(guó)地質(zhì)大學(xué)(武漢)地球科學(xué)學(xué)院,湖北武漢430074;2.中國(guó)地質(zhì)科學(xué)院,北京100037;3.中國(guó)地質(zhì)調(diào)查局成都地質(zhì)調(diào)查中心沉積地質(zhì)研究室,四川成都6100811.School of Earth Sciences,China University of Geosciences,Wuhan 430074,Hubei,China;2.Chinese Academy of Geological S
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