火山岩油气储层特征浅析

火山岩储层是一种特殊的油气储层.火山岩储层的发育在很大程度上依赖于储层的岩性岩相特征,主要为玄武岩、安山岩、以及自碎角砾熔岩,包括爆发相、溢流相、次火山岩相、火山通道相、侵入相和喷发沉积相.火山岩主要靠相互连通的孔、洞、缝组成的网络来构成储集空间.储集空间有原生和次生两大类.我国中-新生代玄武岩储层的测井曲线特征一般是低声波,低感应,低自然伽码,高电阻,高密度;在地震剖面上多表现为低频的强反射,层速度为2 500～5 000 m/s.

Analysis on Oil and Gas Reservoir Characteristics of Volcanic Rocks

The volcanic reservoir is a special kind of oil and gas reservoir. The development of the volcanic reservoir largely depends on the lithologies and lithofacies. The main lithologies are basalt, andesite and fragmentized breccia lava and the lithofacies include outbrusted facies, overflowed facies, subvolcanic facies, encroachment facies and erupted sediment facies. In the volcanic, the pores, holes and slots are connected one another, thus the storaging spaces for oil and gas is formed. In China, the lava reservoir logging curves characteristic of Mesozoic -Cenozoic often shows as "three lower and two higher". On the seismic reflection profile, it pre-sents lower frequency and stronger reflection, the layer speed often changes between 2 500 m/s and 5 000 m/s.