辽河坳陷潜山油藏变质岩储集层原岩恢复

Recovery of Original Rocks in Metamorphic Reservoirs of Paleo-Buried Hills in Liaohe Depression

辽河坳陷古潜山区域变质岩由粒岩、片麻岩和角闪质岩类组成,在薄片微观结构观察基础上,应用岩石地球化学方法进行了原岩分析。各种图解相互印证,发现不同地区不同岩性与其原岩之间的关系。大民屯凹陷中央潜山带的角闪岩具明显火山岩特征,而粒岩则是沉积成因,兴马潜山带的片麻岩类原岩为沉积岩。原岩恢复为深入研究潜山油藏提供了依据。

The regional metamorphic rocks in paleo-buried hills in Liaohe depression are composed of granule rocks, gneiss and amphibolites. The lithogeochemical methods are used to analyze the original rocks of them. The results are supported with each other by the geometric points, which indicate the relations between diverse lithologies and their original rocks in different areas. The study shows that the amphibolites in central buried hills in Damintun sag are of feature of distinct volcanic rock, the granule rocks belongs to depositional origin, and the original rock of gneiss in Xingma buried hills is sedimentary rock. The recovery of original rocks offers solid support for in-depth research of the buried hill reservoirs in this area.