新疆库车坳陷克拉苏构造带异常高压及其成藏效应

异常高压在新疆库车坳陷克拉苏构造带是十分普遍的地质现象 ,它具有地层压力大、压力系数高、异常高压带上方广泛发育巨厚的塑性盐岩和膏泥岩封隔层以及异常高压体内的压力变化不规则的特征。克拉苏构造带的异常高压是由构造抬升和挤压引起的 ,明显具有压力封存箱的特征 ,对该地区油气藏的形成和保存起到十分重要的作用。由于异常高压和断层的影响 ,在克拉苏构造带上形成了上第三系它源、开放的静水压力油藏和白垩系—下第三系它源、半封闭的异常高压气藏两种油气成藏模式

ABNORMALLY HIGH PRESSURE AND ITS EFFECT ON RESERVOIR FORMATION OF KELASU TECTONIC ZONE IN KUQA DEPRESSION IN XINJIANG

Abnormally high pressure is a common geological phenomenon in Kelasu tectonic zone in Xinjiang.It is characterized by high pressure and high pressure coefficient,overpressure zone intervals overlain by very thick and plastic salt and gypsum argillaceous beds of Paleogene,not regular change of pressure in overpressure zone.Tectonic compression and uplift is the main mechanism of overpressure's formation.Overpressure in Kelasu tectonic zone obviously has the characteristics of pressure compartment.It plays very important roles in formation and conservation of the oil reservoir.Caused by the overpressure and fault,two kinds of reservoir models-Neogenic reservoir with extraneous oil source and open static pressure and gas reservoir with extraneous gas source and semi closed overpressure are formed in Kelasu tectonic zone.