江苏中-古生界天然气类型及成藏模式分析

Mesozoic-Palaeozoic Natural Gas Type and Pool Forming Modes in Jiangsu Area

江苏地区中-古生界沉积了下青龙组(T_1x)、二叠系、高家边组(S_1g)-五峰组(O_3w)、幕府山组(∈_1mu)等多套烃源岩,均达到以生气为主的阶段,具有丰富的烃类天然气物质基础。已有钻井中的天然气显示,研究区天然气类型有烃类天然气和非烃类天然气,且具有多种成因类型。经对黄桥CO_2气田的研究认为,研究区储层条件较差,后期的构造裂缝及溶蚀孔洞是天然气的重要储集空间;断层在气藏的形成过程中起着重要的沟通作用,天然气沿深大断裂向上运移聚集是该区重要的成藏模式。

There are multi-source rocks of Mesozoic-Palaeozoic lower Qinglong Formation (T1x). Permian System, Gaojiabian Formation (S1g)-Wufeng Formation (O3w), Mufushan Formation (E1mu) in Jiangsu area, and most of the source rocks are at stage of mainly producing gas and with rich material bases of hydrocarbon natural gas. There is a gas show in well drilling, in the studied area, there exists various gas types of hydrocarbon natural gas and non-hydrocarbon natural gas. Through studying Huangqiao CO2 filed, it is considered that in the studied area reservoir conditions are poor. structural fractures and solution cavity at late stage are the important reservoir space, the reservoir plays an important role of communication in the process of the gas pool forming, the upward migration and accumulation of natural gas along deep and big fracture is an important pool forming mode in the area.