Abstract: Dongpu depressions is an area with very rich natural gas resources so far, three different originated gases have been found, i. e, coal gas, oil associated gas and mixture of both. High deposition rate of Lower Tertiary caused the seconda-ry gas generation process of the underlain caal bed systems within the Carboniferous-Permian sequences and also caused overxnaturity of many oil source beds in Lower Tertiary and became gas prone, therefore abundant gas sources are available in the depression.Intense faulting and subsiding activities has caused the forming of the regianal tectonic pattern with deep sags parallel with high lifted uplifts and also the forming of various structures and structure trends. The frequent chaaging of the lithologic characteristics may form various stratigraphic traps. In Dongpu depression area, there are numerous gas reservoir horizons are vertically existed on stratigraphic section but they are relatively concentrated within a particular stratigraphic interval. The main gas bearing zones are mainly those deeper formations underlain beneath the formation of Shag₃². The gas rich accumulations are laterally formed in those structures situated at the sagging and periphery part of the depression. This was interpreted by the fact that gas generation is strongly intensified at central part of the depression and the gas trapping mechanizms are provided by Iithologic lateral changing and faulting seals.

摘要： 东濮凹陷是一个天然气资原非常丰富的地区,现已探明的天然气有煤成气、油成气和二者的混合气三种成因类型。下第三系的快速沉积使下伏石炭~二叠纪煤系进入二次生气过程,并使本身所含生油气岩系的相当一部分进人过成熟生气期,形成丰富的气源.多种碎屑岩和泥岩的交互沉积,以及多套盐膏层的发有,在空间土构成各种砂泥以及砂泥岩和盐膏岩的迭置,形成多套完整的生储盖系列。强烈的断陷活动造成深沉降和高抬隆的并列出现,并形成多种与断裂活动有关的构造或构造带。