鲁北济阳坳陷沾化凹陷东部潜山的发育及油气成藏控制因素

通过对沾化凹陷东部主要断裂发育演化的特征和主要地震测线的平衡剖面、伸展率分析,对该地区潜山发育过程及其与盆地演化的关系进行了研究,并就潜山油气成藏的控制因素进行了分析。结果表明,沾化凹陷东部潜山发育可以划分为早—中三叠世、晚三叠世、早—中侏罗世的潜山发育前期,晚侏罗世—白垩纪的潜山发育期,古近纪的潜山改造、定型期和新近纪—第四纪的潜山成藏期,断裂活动是本区潜山形成演化的主控因素。沾化凹陷东部潜山油气成藏主要受控于该区中、新生代盆地的叠合关系,中生代凸起和古近纪凹陷的叠合部位是最有利的潜山油气成藏区,中生代凸起和古近纪凸起的叠合部位不利于潜山成藏,往往形成潜山披覆背斜油气藏。

Development of buried hills of the eastern Zhanhua subbasin,Jiyang depression,northern Shandong,China and controlling factors of the formation of petroleum accumulations

Based on the characteristics of the development and evolution of main faults and balanced cross sections and extensional rates of the main seismic profiles, the development of berried hills and its relationship with basin evolution in the east of the Zhanhua subbasin were studied and the controlling factors of the formation of buried hill oil-gas accumulations were analyzed. The development of the berried hills in the study area experienced the early stage of Early-Mid Triassic, Late Triassic and Early-Mid Jurassic development of buried hills, the stage of Late Jurassic to Cretaceous development of buried hills, the stage of Paleocene reworking and finalization of buried hills and the stage of Neogene to Quaternary reservoir formation of buried oil-gas accumulations. The activity of faults was the main controlling factor for the formation and evolution of buried hills. The formation of buried hill oil-gas accumulations in the east of the Zhanhua subbasin was mainly controlled by the superposition of Meso-Cenozoic basins in the area. The site of superposition of the Mesozoic uplift and Paleogene subbasin is most favorable for the formation of buried hill accumulations, while the site of superposition of the Mesozoic uplift and Paleogene subbasin is unfavorable for the formation of buried hill accumulations, where buried hill drape anticlinal traps usually formed.