蜀南黄家场构造气藏地球化学特征及气源对比

GEOCHEMICAL CHARACTERISTICS AND GAS SOURCE CORRELATION OF HUANGJIACHANG STRUCTURE,SOUTHERN SICHUAN

通过对黄家场构造二、三叠系的天然气及储层沥青地球化学特征的分析,并把该构造气源及成因类型进行了对比和判识。认为:黄家场构造三叠系嘉陵江组生烃条件较差,但下伏二叠系烃源丰度较高,且有多条切穿二、三叠系的断层,为油气向上运移提供了通道,嘉陵江组天然气主要来自下伏二叠系。

By the analysis of geochemical characteristics of both natural gas and reservoir asphalt in Permian and Triassic of Huangjiachang Structure, gas source and genetic types in the structure are contrasted and distinguished. The conditions of hydrocarbon generation are very poor in Triassic Jialingjiang Formation of Huangjiachang Structure whereas the source abundance in underlying Permian is higher. Moreover, many faults, cutting through Permian and Triassic, provide channel for hydrocarbon upward migration. Gas in Jialingjiang Formation yields mainly from underlying Permian.