扬子地区志留纪岩相古地理与石油地质条件研究

Lithofacies paleogeography and petroleum geology of the Silurian in Yangtze area

扬子地区志留纪的岩相古地理条件比较有利于油气藏的发育。扬子地区志留系主要是滨浅海碎屑岩和碳酸盐岩 ,下志留统龙马溪组的页 (泥 )岩为主要烃源岩 ,分布广泛、厚度较大 ,处于成熟—过成熟演化阶段 ,储集层为中、上志留统滨浅海碎屑岩 ,在有利的成藏及保存条件下 ,在扬子地区可以形成并保存商业油气藏。扬子地区南部的长江沿线地区是志留系最有利的勘探地区。

Silurian in Yangtze area is mainly composed of carbonate rocks and littoral clastic rocks. The shale rocks of Longmaxi Formation in Lower Silurian, with wide distribution and bigger thickness, are the major source rock; some of them are still in the evolution times of mature or post mature. The reservoirs are mainly littoral clastic rocks of Middle and Upper Silurian, which could form commercial reservoirs under favorable reservoir forming conditions. Through studying the tectonic and lithofacies palaeogeography of Silurian in Yangtze area, the authors hold that the petroleum geologic conditions of Silurian in Yangtze area are more favorable, and the northern Yangtze area along the Yangtze River could be the most favorable exploration area.