The newly discovered Shunbei Oilfield marks a major breakthrough in deep marine carbonate oil and gas exploration in the Tarim Basin. Understanding the petroleum charge history of the deep reservoirs will greatly benefit further petroleum exploration and development in this area. In this paper, we reconstruct the petroleum charge history of the reservoirs by integrating molecular geochemical correlations of reservoir oils and oil components (free oils and quasi-inclusion oils) from reservoir rocks, fluid inclusion analysis and basin modelling results. Molecular parameters derived from steranes, terpanes and aromatic compounds indicate that the reservoir oils, free oils and quasi-inclusion oils were all derived from the same source rock, deposited in a highly reduced marine environment with organic matters being mainly contributed by algae and bacteria. Utilizing the correlation between methylated aromatic compounds and vitrinite reflectance, the calculated vitrinite reflectance (R_c) values for the reservoir oils, free oils and quasi-inclusion oils fall into two distinct maturity ranges, with one spanning from 0.80%R_c to 0.96%R_c, and the other ranging from 1.15%R_c to 1.24%R_c, respectively. The timing of oil charge in the Shunbei Oilfield is constrained by combining fluid inclusion homogenization temperature (Th) with burial history modelling. Two oil charge events occurred in the reservoirs with the first marked by the relatively “low-maturity” oil, occurring in the latest Silurian around 426 Ma; whereas the second represented by the relatively “high-maturity” oil, occurring during the early Carboniferous around 330 Ma. This study highlights the significance of stable tectonic setting and excellent sealing capability of cap rocks for reservoir preservation. The finding unravels the petroleum charge and accumulation history of the Shunbei oil reservoirs and provides new insights for future exploration.

新发现的顺贝油田标志着塔里木盆地深层海相碳酸盐岩油气勘探领域的重大突破。了解深层储层的石油充注历史将大大有利于该地区的进一步石油勘探和开发。在本文中，我们通过整合储层岩石与油藏岩石中的油成分和油成分（游离油和准夹杂油）的分子地球化学相关性，流体包裹体分析和盆地模拟结果，重建了油藏的油气历史。源自甾烷，萜烯和芳族化合物的分子参数表明，储层油，游离油和准夹杂物油均来自同一烃源岩，沉积在高度还原的海洋环境中，有机物主要是藻类和细菌所致。利用甲基化芳族化合物与镜质反射率之间的相关性，计算出的镜质反射率（R_c）储层油，游离油和准夹杂油的值分为两个不同的成熟度范围，一个范围从0.80％R _c到0.96％R _c，另一个范围从1.15％R _c到1.24％R _c， 分别。通过将流体包裹体均质温度（Th）与埋藏历史模拟相结合，来限制顺北油田的注油时间。在储层中发生了两次含油事件，第一个事件以相对“低成熟度”的油为特征，发生在最新的志留纪（Sururian）426 Ma左右；而第二个以相对“高成熟度”的石油为代表，发生在330 Ma左右的石炭纪早期。这项研究突显了稳定的构造环境和盖层岩层优异的封闭能力对于储集层保存的重要性。该发现揭示了顺北油藏的石油充注和聚集历史，并为未来的勘探提供了新的见解。