盐城凹陷含气系统特征分析

ANALYZING THE CHARACTERISTICS OF PETROLEUM SYSTEM IN YANCHENG SAG

从含油气系统理论出发 ,针对盐城凹陷地质特征及Pz、K2 t和E1f1气藏的特点 ,将盐城凹陷纵向上划分为一个含气系统—古生界含气系统 ,并对该系统的基本地质要素和基本地质作用进行了系统的阐述 ,对该含气系统特征进行了归纳总结。研究认为古生界含气系统烃源岩具有两次生烃的特征 ,圈闭类型多样 ,主要以背斜、断块、断鼻构造圈闭为主 ,关键时刻在始新世末。

In the paper, according to the geological features of Yancheng Sag and the characteristics of the gas reservoirs in Pz, K 2t and E 1f 1, a petroleum system, i.e. Paleozoic petroleum system is divided up along the vertical profile in Yancheng Sag by use of petroleum system theory; the basic geological factors and functions of the system are systematically stated; and the characteristics of the petroleum system are generalized and summarized. Through research it was thought that the hydrocarbon source rocks in the Paleozoic petroleum system are of the character of generating hydrocarbons at tow times; the reservoirs are mainly composed of anticline, fault-block and fault-nosing structural traps; and the key period for this system was at the end of Eocene.