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火山碎屑沉积物是重要的油气储层。火山碎屑沉积按成因划分为火山喷发空中降落堆积物、火山碎屑流状堆积物、火山泥流堆积物和火山基浪堆积物等。它们的特征和储层潜能是不同的。火山碎屑沉积物的识别和解释能够极大的影响火山碎屑层序的勘探方法、储油层几何形态和性能的预测。美国亚利桑那洲早侏罗世怀特申组是一个多喷发火山口复合体,把不同成因类型的火山碎屑堆积物和熔岩分为4个相:火口相、近火口相、中间相和远端相。讨论了这些相对储层性能的影响。火山碎屑大部分由化学性活泼的和不稳定矿物组成,在埋藏成岩期间具有迅速和广泛的变化。火山碎屑的赋存,有助于溶解孔隙的发育,能够增强储油层性能。
Volcaniclastic sediments are important oil and gas reservoirs. Volcaniclastic sediments are divided into volcanic eruptions by airborne deposits, volcanic debris flow deposits, volcanic sediments and volcanic-wave deposits. Their characteristics and reservoir potential are different. The identification and interpretation of volcaniclastic sediments can greatly affect the exploration methods of pyroclastic sequence, the prediction of reservoir geometry and properties. The Early Jurassic Whiteissian Formation in the Arizona State of the United States is a multi-jet pyroclastic complex that has volcanic debris deposits and lavas of different genetic types divided into four phases: fracs, near-flames, mesophases, and distal facies . The effects of these relative reservoir properties are discussed. Volcanic debris, mostly composed of chemically active and unstable minerals, has rapid and extensive changes during burial diagenesis. The occurrence of volcanic debris helps to dissolve the development of pores and enhance reservoir performance.