Abstract:

The types of volcanic rock reservoir space, reservoir physical properties and the main controlling factors were systematically studied by the method of reservoir physical property experiment, core casting thin section observation and X?ray diffraction test. The results show that the Yingcheng formation volcanic rocks in the Dehui fault depression have strong alteration, and the reservoir space is dominated by dissolution pores and dissolution fractures. The average porosity of tuff and dacite are 12.40% and 7.47%, respectively, and the permeability is less than 1.000 mD, belonging to type Ⅲ reservoirs. Gas?bearing formations can be further identified based on acoustic and resistivity logging methods. Lithology and lithofacies are the main controlling factors for the development of reservoirs, and lithofacies models of extrusive facies, extrusive facies and explosive facies were established in combination with the characteristics of seismic reflections. It provides an important theoretical basis for clarifying the mechanism of volcanic rock formation and the distribution of reservoirs in the study area.

Key words: Dehui fault depression, Yingcheng Formation, Volcanic rock reservoir, Main controlling factors

摘要：

通过储层物性分析、岩心铸体薄片及X衍射测试等方法，针对德惠断陷营城组火山岩储集空间类型、储层物性及主控因素进行了系统研究。结果表明，德惠断陷营城组火山岩蚀变作用较强，储集空间以溶蚀孔和溶蚀缝为主；凝灰岩和英安岩平均孔隙度分别为12.40%、7.47%，渗透率均小于1.000 mD，属于Ⅲ类储层，根据声波时差和电阻率测井方法可进一步识别含气地层；岩性和岩相是储层发育的主要控制因素。结合地震反射特征，分别建立了侵出相?喷溢相和爆发相岩相模式，为厘清研究区火山岩成储机理和储层分布规律提供了重要的理论依据。

关键词: 德惠断陷, 营城组, 火山岩储层, 主控因素