Tectonic evolution and prototype basins Reconstruction in the Jimsar and Jinan depressions, Eastern Junggar Basin
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摘要: 自2020年开始,随着准噶尔盆地吉木萨尔凹陷双吉构造带的研究深入、萨探1井在二叠系井井子沟组试油获得高产油流,表明了吉木萨尔凹陷、吉南凹陷具有良好的常规油气勘探潜力。为深入研究吉木萨尔凹陷和吉南凹陷的地质特征及勘探潜力,本论文综合岩心、录井、测井和地震等资料,通过识别区域不整合面,划分出不同构造阶段,得到构造与地层演化的关系。在此基础上恢复各地层发育过程,建立构造与研究区内隆凹演化的耦合关系,对原型盆地进行恢复。研究表明,吉木萨尔及吉南凹陷发育有五个区域大型不整合面,经历了四幕构造活动。研究区地层演化特征从“北高南低”(早二叠世)发展为“南高北低”(古近系、新近系)。原型盆地也由早二叠世的“多凸多凹” 格局,在古近纪、新近纪时期转变为“少凸大凹”的构造格局。构造与隆凹演化耦合关系的确立及各时期原型盆地的恢复为厘清吉木萨尔凹陷、吉南凹陷不同时期的盆地特征奠定重要基础,有助于深化吉木萨尔凹陷、吉南凹陷的油气勘探工作。Abstract: Since 2020, with the in-depth research of the Shuangji structure belt in the Jimsar depression of the Junggar Basin, and the high-yield oil flow obtained from the Triassic Jingjingzigou Formation in the Sa Tan 1 well, it has been demonstrated that the Jimsar depression and Jinan depression have good potential for conventional oil and gas exploration. In order to further study the geological characteristics and exploration potential of the Jimsar and Jinan depressions, this paper comprehensively analyzes data from core samples, logging, well logging, and seismic surveys, identifies regional unconformities, divides different tectonic stages, and establishes the relationship between tectonic and stratigraphic evolution. Based on this, the development process of each stratum is restored, the coupling relationship between tectonic and the evolution of the uplift and depression within the research area is established, and the prototype basin is restored. The study shows that there are five large unconformities in the Jimsar and Jinan depressions, which have undergone four tectonic activities. The stratigraphic evolution characteristics of the study area have developed from "north high and south low" in the early Permian to "south high and north low" in the Paleogene and Neogene. The original basin also changed from the "multi-convex and multi-concave" pattern in the early Permian to the "few convex and large concave" structural pattern in the Paleogene and Neogene. The establishment of the coupling relationship between tectonic and the evolution of the uplift and depression at different times and the restoration of the prototype basin at each period lays an important foundation for clarifying the basin characteristics of the Jimsar and Jinan depressions at different periods and helps to deepen oil and gas exploration in these areas.
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Key words:
- Keywords:Tectonic curtains /
- prototype basins /
- Jinan depression /
- Jimsar depression /
- Junggar Basin
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