中、上扬子区志留系油气成藏特点与勘探前景

doi:10.11743/ogg20080507

摘要/Abstract

摘要：

中、上扬子区上奥陶统—志留系优质烃源岩主要发育于上奥陶统五峰组和下志留统底部,以好烃源岩-最好烃源岩为主。志留系碎屑岩和碳酸盐岩两类储集岩均以低孔低渗-特低孔低渗为特征,碎屑岩是主要储集岩类。下志留统龙马溪组为优势盖层发育层位,是一套良好的区域性盖层,现今总体上处于中成岩 B 期—晚成岩期,虽演化程度高,但仍具有良好的封盖能力。上扬子川东地区大规模生烃期较早,大部分志留系烃源岩在中侏罗世就达到了生油高峰;中扬子区大部分志留系烃源岩达到生油高峰期较晚,为晚三叠世。古构造控制着志留系油气的运移方向和聚集部位,川东南—鄂西渝东区为志留系天然气勘探最有利区,江汉平原南部冲断褶皱区为有利区。

关键词: 成藏条件, 成藏特点, 勘探前景, 志留系, 中、上扬子区

Abstract:

High quality source rocks in the Upper Ordovician and the Lower Silurian in southern China are mainly developed in the Wufeng Formation of the Upper Ordovician and at the bottom of the Lower Silurian.Both the Silurian elastic reservoirs and carbonate reservoirs feature in low-and ultra-low porosity and permeability and the former is the predominant reservoir type.The Lower Silurian Longrnaxi Formation is a set of quality regional seal and is in the B to late stage of diagenesis as a whole.Although being at high level of evolution,they serve as good sealing for petroleum accumulations.The eastern Sichuan basin of the Upper Yangtze Platform had witnessed large-scale hydrocarbon generation in a relatively early time with most of the Silurian source rocks reaching hydrocarbon generation peak during the middle Jurassic;while most of the Silurian source rocks in the Middle Yangtze Platform entered hydrocarbon generation peak late in the Late Triassic.The hydrocarbon migration and accumulation during the Silurian were controlled by Paleo-tectonic evolution.Therefore,it is suggested that the southwestern Sichuan provinces,western Hubei Province,and eastern Chongqing municipality are the most favorable areas for exploration of Silurian gas,while the thrust-fold area in the southern Jianghan plain is the favorable area.

Key words: accumulation condition, accumulation character, exploration prospect, Silurian, Middle and Upper Yangtze Platform

中图分类号:

TE112.3

肖开华,李双建,汪新伟,等. 中、上扬子区志留系油气成藏特点与勘探前景[J]. 石油与天然气地质, 2008, 29(5): 589-596. doi: 10.11743/ogg20080507 Xiao Kaihua,Li Shuangjian,Wang Xinwei,et al. Hydrocarbon accumulation features and exploration direction in the Silurian of the Middle-Upper Yangtze Platform[J]. Oil & Gas Geology, 2008, 29(5): 589-596. doi: 10.11743/ogg20080507

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