埕岛油田古生界构造特征及演化

PALEOZOIC STRUCTURES AND THEIR EVOLUTION IN CHENGDAO OIL FIELD

古生界埕岛油田的重要含油层系，其基本构造格避是在北东倾背景下被埕北，埕北20，埕北30等断层分割控制的3个潜山构造带，它们呈帚状向南收敛于埕北低凸起的南端，根据沉积建造类型，构造特征，地震反射特征，测井曲线特征和地层接触关系，可将埕岛地区的地层划分为太古界，古生界一中生界和新生界3个构造层，本区燕山期的伸展方向为近东西向，喜山期为山东－南西向，区内古生界的构造演化历史可划分为古生代稳定克拉通发展，钱支期褶皱发育，燕山期潜山早期发育，早三纪潜山构造定型，晚第三纪一第四纪埋深加大等五个阶段，潜山油气藏形成于早第三纪晚期和晚期第三纪。

In Chengdao oil field, the Paleozoic, an important oil bearing series, is cut into three buried hill belts by several faults such as Chengbei, Chengbei 20 and Chengbei 30 under a general northeast dipping configuration, which converge in the south end of Chengbei low uplift in a brush shape. According to types of sedimentary formation, structural characteristics, seismic reflections, logging curves and stratigraphic contacts, the series can be divided into three structural layers, i.e. Archean, Paleozoic Mesozoic and Cenozoic. The area's extension is nearly east west during Yanshan movement and northeast southwest during Himalaya movement. The Paleozoic has exprienced five stages of tectonic structural evolution, including craton development in Paleozoic, folding in Indosinian movement, buried hill initiation in Yanshan movement, buried hill formation in Paleogene and buried hill deepening in Neogene and Quaternary. The buried hill reservoirs may form during Late Paleogene and Neogene.