济阳坳陷石炭-二叠系太原组有效烃源岩分析

摘要

济阳坳陷石炭-二叠系烃源岩在多期构造运动的影响下发生多次生烃演化,有机质具有阶段性成熟演化特征和多次生烃过程,其中燕山期和喜马拉雅期是济阳坳陷石炭-二叠系烃源岩最重要的生烃期.采用煤岩学和地球化学相结合的方法对石炭-二叠系源岩进行总体评价,就主要有效烃源岩太原组从埋藏史、成熟生烃史进行了重点剖析,判定太原组有效烃源岩主要分布在沾化凹陷、东营凹陷和惠民凹陷,而且生烃强度较大,有可能形成"小而肥"的油气藏.%Because of tectonic movements,multiple evolutions of hydrocarbon generation occurred in source rock in permo-carboniferous coal measure in Jiyang depression. Organic matter is characteristic of periodical maturity evolution and multiple hydrocarbon generation processes. Yanshanian period and Himalayan period are the most important generation processes of permo-carboniferous source rock in Jiyang depression. Coal petrology and geochemistry method are combined to evaluate the source rock, which is focused on effective source rock of Taiyuan formation in terms of the history of burial and mature hydrocarbon generation. The results show that the effective source rock of Taiyuan formation is distributed over Zhanhua depression, Dongying depression, and Huimin depression. Besides, the hydrocarbon-generating strength is big,which could form small-and-rich petroleum reservoir.