张运波,王明健,杜治利,等. 准噶尔盆地南缘四棵树凹陷主力烃源岩及油源对比[J]. 海洋地质前沿,2020,36(12):39-48. DOI: 10.16028/j.1009-2722.2020.102
    引用本文: 张运波,王明健,杜治利,等. 准噶尔盆地南缘四棵树凹陷主力烃源岩及油源对比[J]. 海洋地质前沿,2020,36(12):39-48. DOI: 10.16028/j.1009-2722.2020.102
    ZHANG Yunbo, WANG Mingjian, DU Zhili, YUAN Qingdong. MAIN OIL SOURCE ROCKS AND OIL-SOURCE CORRELATION IN THE SIKESHU SAG, THE SOUTHERN MARGIN OF JUNGGAR BASIN[J]. Marine Geology Frontiers, 2020, 36(12): 39-48. DOI: 10.16028/j.1009-2722.2020.102
    Citation: ZHANG Yunbo, WANG Mingjian, DU Zhili, YUAN Qingdong. MAIN OIL SOURCE ROCKS AND OIL-SOURCE CORRELATION IN THE SIKESHU SAG, THE SOUTHERN MARGIN OF JUNGGAR BASIN[J]. Marine Geology Frontiers, 2020, 36(12): 39-48. DOI: 10.16028/j.1009-2722.2020.102

    准噶尔盆地南缘四棵树凹陷主力烃源岩及油源对比

    MAIN OIL SOURCE ROCKS AND OIL-SOURCE CORRELATION IN THE SIKESHU SAG, THE SOUTHERN MARGIN OF JUNGGAR BASIN

    • 摘要: 2019年部署于准噶尔盆地南缘西段四棵树凹陷高泉东背斜的风险探井高探1井白垩系清水河组测试获日产千方高产油气流,证实了四棵树凹陷具备成为大型油气富集区的潜力。为了查明四棵树凹陷油气富集规律、明确未来勘探方向,通过收集整理重点探井油气地化数据,对研究区进行了烃源岩评价、油源对比及油气运移特征研究。结果表明:①卡因迪克地区主要发育八道湾组和安集海河组2套3类有效烃源岩,其中八道湾组烃源岩有机质类型主要为Ⅱ2和Ⅲ型,处于低成熟阶段。安集海河组烃源岩埋深>4 000 m才能成为有效烃源岩;②西湖背斜原油可以分为A类和B类,分别对应于卡因迪克地区侏罗系八道湾组泥质烃源岩和煤系烃源岩,且A类原油原始生油母质总体优于B类原油;③高泉背斜区原油与卡因迪克地区烃源岩不具备亲缘关系,推测高探1井油气来自于其南部的山前生烃中心,其南部是下一步油气勘探有利区。

       

      Abstract: The risk exploration well Gaotan-1 was operated in 2019 on the Gaoquan east anticline of the Sikeshu Sag on the southern margin of the Junggar Basin. The Cretaceous Qingshuihe Formation was tested and obtained a daily high-yield oil-producing gas stream, confirming that the Sikeshu Sag is a potentially enriched area for oil and gas. In order to ascertain the oil and gas enrichment process in the Sikeshu Sag and clarify the future exploration direction, by collecting and sorting out the oil and gas geochemical data from key exploration wells, we made a detailed study in this paper on source rock evaluation, oil source comparison, and oil and gas migration characteristics. The results show that: ① Two sets of effective source rocks in the Badaowan Formation and Anjihaihe Formation respectively are well developed in the Kayindike area. The organic matters of the source rocks in the Badaowan Formation are dominated by types II2 and III in low-maturity stage. The source rocks in the Anjihaihe Formation, however, must be buried deeper than 4 000 m to become effective source rocks; ② The West Lake anticline crude oil can be classified into types of A and B, corresponding to the argillaceous source rocks of the Jurassic Badaowan Formation in the Kayindike area and the coal series source rocks, and the original crude oil parent materials of Type A crude oil is better than that of Type B; ③ The crude oil in the Gaoquan structural area has no oil source relationship with the source rocks in Kayindike area. It is speculated that the crude oil from Well Gaotan 1 came from the piedmont hydrocarbon generation center in the south, and, therefore, the south is a favorable area for oil and gas exploration.

       

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