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海拉尔盆地呼伦湖凹陷西界下白垩统上库力组球粒流纹岩中与球粒有关的油气储集空间类型包括球粒间缝、层间缝、球粒内部同心环状和网状微裂缝、空腔孔、溶蚀孔和脱玻化孔.球粒间缝和层间缝主要制约了球粒之间有效面孔率的大小.脱玻化孔、微裂缝和空腔孔以及球粒直径控制了球粒内部有效面孔率的大小.球粒内部微裂缝的发育程度和类型决定了溶蚀作用的程度.溶蚀作用从没有微裂缝→中等发育的放射状和环状微裂缝→非常发育的环状、网状微裂缝逐渐增强.环状、网状微裂缝的另外一个重要效应是沟通脱玻化孔,形成孔缝网络.冷凝收缩作用不仅控制了球粒间缝的形成与发育,还控制了微裂缝和空腔孔的形成和发育.球粒直径制约了冷凝收缩作用,尤其是当直径介于常见的球粒和石泡两者之间时,最有利于微裂缝和空腔孔的形成.脱玻化孔本身就是良好的储集空间,同时还能为地下水和有机质的溶蚀提供显微通道,而这一通道需要微裂缝的沟通才能更好的发挥作用.
Types of oil and gas reservoirs associated with pellets in the Lower Cretaceous Upper Cretaceous pellet rhyolite in the western Hulunhu Depression of the Hailaer Basin include intergranular spherulites, interlamellar seams, concentric rings within the pellets, and reticular Micro-cracks, cavities, cavities, and devitrified pores.The intergranular cracks and interlamellar seams mainly restrict the effective porosity between the spherulites.The devitrification pores, microcracks, cavity pores and spherules The diameter controls the size of the effective internal porosity of the spherulites. The degree and type of microfractures within the spherulites determine the degree of dissolution. There is no dissolution of microfractures → moderately developed radial and annular microfractures → well-developed rings Shaped, mesh-like micro-cracks gradually increased.On the other important effect of ring-shaped, mesh-like micro-cracks is to communicate with the devitrified pores to form a network of pores.Condensation and contraction not only control the formation and development of intergranular cracks, but also control The formation and development of micro-cracks and cavity pores.The size of the pellets restricts the condensation and shrinkage, especially when the diameter is between the common pellets and bubbles, which is most favorable to the micro-cracks and cavity pores Formation. The devitrification hole itself is good The reservoir space, while providing microscopic channels for the dissolution of groundwater and soil organic matter, and this channel needs to communicate better micro-cracks play a role.