临清拗陷东部构造样式及其形成演化

临清拗陷东部自中生代以来构造体制多次转变,盆地演化及构造特征复杂,发育多种类型的构造样式.以盆地分析理论为指导,通过对全区的地震资料的精细解释,总结研究区的构造样式类型,并对其成因进行分析,探讨构造演化上古生界煤成气成藏的控制作用.结果表明:临清拗陷东部构造样式可分为挤压、伸展和反转3种,其中,挤压构造样式以叠瓦逆冲为主,伸展构造样式分为掀斜断块、滑动断阶和重力背形3种,反转构造样式分为正反转和负反转2种.研究区在地质历史上构造活动剧烈,经历印支运动和燕山晚期运动的强烈挤压、燕山早期运动的弱挤压作用以及燕山中期和喜山早期的强烈拉张,不同类型的构造样式由不同的构造运动所形成;上古生界煤成气成藏主要受构造演化所控制,主要发育4种油气藏类型.该研究将对研究区上古生界煤成气勘探提供指导作用.

Tectonic patterns and their formation and evolution in eastern Linqing depression

The tectonic framework of eastern Linqing depression has changed several times since Mesozoic.Basin evolution and tectonic characteristic are very complex in this area.Structural patterns and their formation as well as the effect of tectonic evolution on accumulation of Upper Palaeozoic coal-derived gasin eastern Linqing depression were not well studied,which restricted the hydrocarbon exploration.Guided by the theory of basin analysis,we analyzed the structural patterns,their genesis and the controlling effect of tectonic evolution on accumulation of Upper Palaeozoic coal-derived gas by the fine interpretation of seismic data.Structural styles can be divided into three types which are of compressional structural style,extensional structural style and inverted structural style.Each structural style includes several sub-structural styles.The compressional structural style is mainly imbricate thrusting.The extensional structural styles can be divided into tilted fault block,slipping fault step and gravity antiformal anticline.Inverted structural style consists of positive inversion and negative inversion.The studying area has experienced intense tectonic movements which are strong compression in Indosinian period and Yanshan period,weak compression in Early Yanshan period and strong tension in both Middle Yanshan period and early Himalayan period.Different types of structural style were formed by different tectonic movements.Accumulation of Upper Palaeozoic coal-derived gas is mainly controlled by tectonic evolution and hydrocarbon accumulation models can be divided into four types.The above findings can provide guidance for the subsequent hydrocarbon exploration of the study area.