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首页> 外文期刊>Journal of Asian earth sciences >Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China
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Geochemical study of crude oils from the Xifeng oilfield of the Ordos basin, China

机译：鄂尔多斯盆地西峰油田原油地球化学研究

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The Xifeng oilfield is the largest newly-discovered oilfield in the Ordos basin. In order to determine the possible source, crude oils collected systematically from the oilfield and an adjacent oilfield have been examined isotopically and molecularly. The predominance of long-chain n-alkanes, high abundance of C_(29) sterane, lower ratios of C_(25)/C_(26) tricyclic terpane and C_(25) tricyclic terpane/C_(24) tetracyclic terpane and high C_(24) tetracyclic terpane/(C_(24) tetracyclic terpane + C_(26) tricyclic terpanes ratio in the studied oils suggest generation from a source with mixed terrigenous and algal-bacterial organic matter. The presence of diterpenoid hydrocarbon with abietane skeletons is characteristic of the main contribution of higher land plants to the oils. The biomarker distributions in the oils show that they were formed under a weakly reducing freshwater environment. Molecular maturity parameters indicate that the crude oils are mature. The oil-source rock correlation and oil migration investigation suggest that the oils in the Xifeng oilfield originated from the source rocks of the Yanchang formation deposited in a shallow to deep freshwater lacustrine environment, especially Chang-7 source rocks. The data from the distribution of pyrrolic nitrogen compounds indicate that the charging direction of the Chang-8 crude oils is mainly from the Zhuang 12 well northeast of the oilfield toward the southwest. This direction of oil migration is consistent with that indicated by regional geological data.
机译：西峰油田是鄂尔多斯盆地最大的新发现油田。为了确定可能的来源，已经从同位素和分子上检查了从油田和邻近油田系统收集的原油。长链正构烷烃的优势，高丰度的C_（29）甾烷，较低的C_（25）/ C_（26）三环戊烷和C_（25）三环戊烷/ C_（24）四环戊烷比例和高C_ （24）研究中的油中的四环萜烯/（C_（24）四环萜烯+ C_（26）三环萜烯的比率表明是从具有陆源和藻类细菌有机物混合的来源中产生的，具有安息香骨架的二萜烃的存在是其特征。陆生植物在油中的生物标志物分布表明它们是在弱还原淡水环境中形成的，分子成熟度参数表明原油是成熟的，油源岩的相关性和油的运移调查表明，西峰油田的油源来自浅至深层淡水湖相环境中沉积的延长组烃源岩，特别是长7烃源岩。吡咯含氮化合物的分布表明，长8原油的装填方向主要是从油田东北的壮12井向西南。石油迁移的方向与区域地质数据表明的方向一致。

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