济阳坳陷不整合结构的类型、特征及意义

Type and feature of unconformity configuration in Jiyang Depression and its significance
in petroleumexploration

向立宏 周 杰 赵乐强 陈 涛

中国石油大学信息资源学院， 山东 东营  257061 胜利油田分公司地质科学研究院，山东 东营 257015 胜利油田分公司胜利采油厂，山东 东营 257015

College of Geo-Resources and Information, China University of Petroleum, Dongying 257061, China Geological Scientific Research Institute, Shengli Oilfield Company, SINOPEC, Dongying 257015, China Shengli Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying 257015, China

按照不整合面之下风化黏土层和半风化岩石的发育程度，将济阳坳陷不整合结构划分成Ⅰ1型、Ⅰ2型和Ⅱ型3种类型。由于不整合结构的不同，在岩石学、矿物学、元素地球化学、风化程度指标及测井响应等特征上也具有一定差异。在空间展布上，Ⅰ1型结构主要分布在第三系与前第三系、古近系与新近系之间的不整合，平面上多位于凸起、斜坡上地形相对平缓的地区；Ⅰ2型结构发育广泛，但以盆地斜坡为主；Ⅱ型结构主要分布在古近系内部规模相对较小的不整合，区带上集中于盆地中靠近洼陷的部位。不整合结构的研究对于油气勘探具有重要意义。

The unconformity configuration in Jiyang Depression can be divided into three types (typeⅠ₁, typeⅠ₂ and typeⅡ) according to the development of weathered crust and weathered clay. The unconformity rocks have particular mineralogical and element geochemical character. Each type has different features in mineralogy, petrology, geochemistry of elements, chemical weathering index and logging response etc. In spatial distribution, typeⅠ₁ is mainly distributed in the unconformities of Tertiary/pre-Tertiary and Paleogene/Neogene and located in the area with gentle topography on the slope and uplift, typeⅠ₂ developed widely, and mainly
distributed in the slope area of the basin, and typeⅡis mainly distributed in the Paleogene unconformity with small scale and near the sag. In a word, the study of the unconformity configuration has a great significance to the petroleum exploration.