东辛油气田构造特征与油气富集规律研究

东辛油气田为我国最大的复杂断块油气田，该区总体上由东营穹窿背斜、辛镇长轴背斜及过渡带三部分组成，受南北两翼近东西向延伸的二级断层的控制，呈现为东西向堑式背斜带。该区的断裂发育，断块多，断块大小、形状各异。构造的形成与下伏始新统孔店组上部和沙河街组下部的盐、膏岩和欠压实泥岩组成的塑性层上拱有直接关系。多期断裂活动导致油气在纵向上运移活跃，油气分布层位多，含油气井段长，油气藏沿断层呈叠瓦式展布，且由深到浅依次出现油藏、油气藏、气藏的完整序列。不同断块区油气富集程度差异大，构造翼部断块区较核部油气富集

STRUCTURAL FEATURE AND OIL GAS DISTRIBUTION IN DONGXIN COMPLICATED FAULT BLOCK OIL GAS FIELD

ongxin structure is a complicated fault anticline zone with a long grabon within the central part of east west trend ,which mainly consists of Dongying dome and Xinzhen anticline. There are a lot of faults and fault blocks which have a variety of shape and size in this region. The main faults in east west trend both flanks of the anticline zone played a very important role for the evolution of structure and accumulation of oil and gas. The formation of Dongxin structure is mainly a result of the diapir of thick plastic formations which consist of salt,gypsum and uncompacted mudstone in Kongdian formation and member 4 of Shahejie Formation of Eocene. The multiple petroliferous horizons in Dongxin oil gas field occur from 900 m to 3280 m in depth. From the lowest petroliferous horizon to the uppert one, oil pools, oil gas pools and gas pools occured in turn. Dongying area and both flanks of the anticline zone concentrated more oil and gas than other areas.