Marine oil source of the Yingmaili Oilfield in the Tarim Basin
Marine oil source of the Yingmaili Oilfield in the Tarim Basin
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DOI：
10.1016/j.marpetgeo.2015.07.016
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发表时间：
2015-12
影响因子：
4.2
通讯作者：
Sumei Li;X. Pang;Baoshou Zhang;Hao Sun;Aiyan Sun
中科院分区：
文献类型：
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作者：
Sumei Li;X. Pang;Baoshou Zhang;Hao Sun;Aiyan Sun
塔里木盆地虽然发现了大量的石油，但其成因至今仍存在争议。以英买力油田为例，进一步研究了该盆地的油气生成和聚集规律。详细的地球化学研究进行了解开的形成机制。油田原油与中、上奥陶统（O2+3）岩石（或类似岩石）对比良好。通过饱和烃和芳烃成熟度参数的油-油和油-源岩对比表明，英买力及邻区原油主要与6000 m以上的烃源岩可比。结果还表明，碳酸盐岩可能是重要的潜在烃源岩，其特征是原油中芳香族硫化物丰度较高，C29/C30-藿烷和C35/C34-藿烷比值较高，具有碳酸盐岩烃源岩的典型特征。因此，威尔斯YG 2井和YG 2 -1C井的原油比YM 2井的原油更适合作为O2+ 3源岩（或类似源岩）的端员。并建议对以往油气沿奥陶系不整合面沿着运移的模式进行修正。
Although a large amount of petroleum has been discovered in the Tarim Basin, the origin of the oils is still disputed. Yingmaili Oilfield was selected as a case study to further examine hydrocarbon generation and accumulation in the basin. Detailed geochemical studies were conducted to unravel the formation mechanisms. The oils in the field correlate well with Middle–Upper Ordovician (O2+3) rocks (or similar rocks). Oil–oil and oil–source rock correlation by maturity parameters of saturate and aromatic hydrocarbons suggest that the Yingmaili and adjacent oils are primarily comparable to source rocks deeper than 6000 m. The results also showed that carbonates might be important potential source rocks as indicated by a relatively high abundance of aromatic sulfur compounds and relatively high C29/C30-hopane and C35/C34-hopane ratios of the oils, which are typical features of carbonate source rocks. We suggest the oil from wells YG2 and YG2-1C are more suitable to be end members from the O2+3source rocks (or similar rocks) than the oil from well YM2 as previously suggested. We also suggest that the previous model of hydrocarbon migration along the Ordovician unconformity should be revised.