| 二连盆地乌兰花凹陷烃源灶表征及其对油气分布的控制 |
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| 关键词:Wulanhua Sag lacustrine source rock organofacies thermal maturity hydrocarbon expulsion intensity |
| 基金项目:国家科技重大专项(编号: 2016ZX05007001-003);中石油华北油田课题(编号:HBYT-YJY-2017-JS-152);西藏自治区科技计划项目(编号: XZ202101ZY0014G) |
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| Characteristics of Source Kitchens in the Wulanhua Sag, Erlian Basin and Its Control on Petroleum Distribution |
| The Wulanhua Sag is a newly discovered oil-rich sag in the southern part of the Erlian Basin, with obvious differences in proven petroleum resources in the south and north sub-sags. To accurately evaluate the petroleum resource potential of the Wulanhua Sag, the characteristics of source kitchens in the Wulanhua Sag were systematically analyzed, and the relationship between source kitchens and petroleum distribution was discussed. Studies show that source rock contains organofacies C, D/E, and F. Organofacies were primarily controlled by tectono-stratigraphy evolution of the sag. The development of high-quality oil-prone source rock (organofacies C) in the south and north sub-sags shows significant differences. In the south sub-sag, organofacies C mainly occurs in the Aershan Formation (K1ba), and the source rocks in the first member of the Tengger Formation (K1bt1) mainly consist of organofacies D/E. However, organofacies C occurs in both K1ba and K1bt1 in the north sub-sag. Thermal history calibration results of many wells indicate that the maturity threshold of the source rock in the Wulanhua Sag is approximately 2000 m. According to this rule, only the source rock in K1ba in the south sub-sag has entered the mature stage. Oil expelled from organofacies C in the K1ba is 0.5– 7.9 MMT/km2, which makes a major contribution to proven oil accumulations. However, organofacies C is mainly developed in the upper part of the K1ba in the north sub-sag with lower maturity, and the maximum value of thermal maturity is only 0.78 %Ro. The hydrocarbon expulsion intensity of the source kitchen is less than 0.2 MMT/km2 in the north sub-sag and is not enough to form oil accumulation. The proven oil accumulations in the Wulanhua Sag are all located in the south sub-sag and concentrated around the source kitchens, indicating the accumulation efficiency of nearby source kitchens. |
| FENG Wei-ping,WANG Fei-yu,YANG Xue-di,JIANG Tao,GAO Ge,LI Xiang-yang.2023.Characteristics of Source Kitchens in the Wulanhua Sag, Erlian Basin and Its Control on Petroleum Distribution[J].Acta Geoscientica Sinica,44(3):531-542. |
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