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辽河坳陷火山岩主要为玄武岩、粗面岩、响岩、安山岩、流纹岩和凝灰岩,以抗压强度较弱的少含暗色矿物的粗面岩和流纹岩为主。粗面岩主要分布在东部凹陷第三系,流纹岩主要分布在西部凹陷中生界。岩石化学分析表明,以浅色造岩矿物为主的火山岩抗压强度低,在应力作用下容易形成裂缝,而含暗色矿物较多的火山岩,抗压强度高,在相同应力下难以形成裂缝,并且暗色矿物蚀变后形成的绿泥石、方解石等,往往将早期形成的裂缝充填。运用岩石化学分析和测井响应特征,分别建立火山岩岩性和火山岩储层划分标准;同时,根据中子和电阻率测井响应特征,将火山岩划分为轻度蚀变、中度蚀变、重度蚀变和泥化火山岩4类。应用氧化物分析法,可将东部凹陷火山岩区分开;利用能谱测井,可将西部凹陷的火山岩划分出来;采用测井交会图法,可以划分辽河坳陷火山岩储层。
The volcanic rocks in the Liaohe Depression are mainly basalt, trachyte, anabolism, andesite, rhyolite and tuff, with less compressive strength less chalcopyrite and rhyolite containing dark mineral. Rough rocks are mainly distributed in the Tertiary Depression in the Eastern Depression, rhyolites are mainly distributed in the Mesozoic Cenozoic in the western sag. Petrochemical analysis shows that the volcanic rocks, mainly composed of light-colored rock-forming minerals, have low compressive strength and are prone to fracture under the action of stress. Volcanic rocks containing more dark-colored minerals have high compressive strength and are difficult to form cracks under the same stress. After the formation of dark mineral chlorite chlorite, calcite, etc., tend to fill the early formation of cracks. Based on the characteristics of petrochemical analysis and logging response, volcanic lithology and volcanic reservoir division criteria are respectively established. At the same time, volcanic rocks are divided into mild alteration, moderate alteration and heavy degree according to the response characteristics of neutron and resistivity logging Alteration and Mudding Volcanics 4 categories. By using oxide analysis method, volcanic rocks in the eastern sag can be distinguished. Volcanic rocks in the western sag can be separated by energy spectrum logging. Volcano rock reservoirs in the Liaohe Depression can be divided by logging cross plot method.