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对研究区火山岩岩性特征、储集空间类型、孔隙演化特征及其主要影响因素进行了深入分析,研究了区内6种火山岩的岩性特征及4个亚类储集空间的发育特征,深入分析了区内主要的火山岩储层如安山岩、玄武岩、火山角砾岩和凝灰岩等的孔隙演化过程及其控制因素。认为火山岩原生孔隙因连通性差而不能形成有效储层,而经过后期改造作用,尤其是溶蚀作用和构造运动将大大改善火山岩的储集性能而成为有效储层。在上述研究的基础上,将火山岩储集空间的演化过程分为火山岩的形成阶段、风化剥蚀淋滤阶段、埋藏和构造作用阶段、溶蚀改造作用阶段和油气聚集成藏阶段5个阶段,并以安山岩和玄武岩为例,建立了火山岩储层的孔隙演化模式。
The lithologic characteristics, reservoir space types, pore evolution characteristics and their main influencing factors of volcanic rocks in the study area are deeply analyzed. The lithologic characteristics of six volcanic rocks and the developmental characteristics of four sub-types of reservoir space are studied. The pore evolution and controlling factors of the main volcanic reservoirs in the area such as andesite, basalt, volcanic breccia and tuff were analyzed. It is considered that the volcanic primary pores can not form effective reservoirs due to poor connectivity, and post-alteration, especially dissolution and tectonic movement, will greatly improve the reservoir properties of volcanic rocks and become effective reservoirs. On the basis of the above studies, the evolution of volcanic reservoir space is divided into five stages: volcanic rock formation stage, weathering and erosion leaching stage, burial and tectonism stage, dissolution and transformation stage and hydrocarbon accumulation and accumulation stage. Andesite and basalt, for example, established the pore evolution model of volcanic reservoirs.