Different Segmentations and Zones during Tertiary in the Southern Margin of Junggar Basin: Correlation of reservoir property and controlling factors
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摘要: 针对前陆盆地所特有的“不同段、不同排构造”这一特点，通过对准噶尔南缘13口钻井的岩心精细描述、储层显微特征研究、数据统计及镜质体反射率（Ro）等资料的综合分析，并以“不同段、不同排构造”作为研究对比单元，认为准噶尔南缘前陆盆地古近系—新近系沙湾组储集性之间在物性、成分成熟度、结构成熟度等方面均存在明显差异，形成这些差异的主要控制因素为：①不同沉积物源与沉积相影响储集性，即使在同一物源、同一沉积相类型内，砂体类型不同造成了储集性的差异；② 成岩相的不同、填隙物(泥质、胶结物）含量与分布的不均匀性与溶蚀作用均影响储集性；③ 机械压实作用形成的埋藏热效应主要影响古近系储集层，构造挤压作用影响相对要弱；④ 新近系储集层主要受构造挤压作用影响，埋藏热效应则转变为次要影响因素。Abstract: A peculiar characteristic, different segmentations and zones, belongs to foreland basin. In southern margin of Junggar Basin, through a lot of cores of 13 wells describing, reservoir studing and some results of vitrinite reflectance analyzing, there are 3 different factors of reservoir at segmentations and zones in Tertiary. They are different porosity, permeability, compositional maturity and textural maturity. In different segmentations and zones as a research unit in thrust belt, the controlling factors of the different reservoir include ①different sedimentary feeders and sedimentary facies and different sandstone body that belonging at the same sedimentary facies. ②Different Lapidofacies, clay and cement that located at intergrain and dissolution in reservoir.③The main controlling reservoir is buried thermal effect and not the tectonic compression in Palaeogene. And ④because of the Tianshan Mountain’s uplifting in Neogene the tectonic compression changes the main controlling factor of reservoir in southern margin of Junggar Foreland Basin.
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Key words:
- southern margin of Junggar Basin
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