摘要
我国南部有三种不同类型的保存区:①古生界裸露区;②中新生代盆地覆盖区;③推覆构造的锋带区。中三叠统一侏罗系、志留系和下寒武统均为有效的区域性盖层。有利保存区必须同时具备纵向上良好的封盖条件和横向封闭性的水文条件。全区以石柱复向斜和赤水地区的保存条件为最佳。
Marine carbonate rocks in South China cover an area of 200×10~4 km^2.From UpperSinian to Lower Triassic,the total thickness of source rocks is up to several thousand me-ters with rich organic matter.But preservative condition underwent serious damage as in-tensive tectonic movements took place in Indo-China period.As faults and denuda-tion caused surface water to distroy reservoir,thus favourable preservation region must be the one that has fine covery rocks in vertical and good sealing hydrogeological conditionin horizontal.The Middle Triassic-Jurassic,Silurian,Lower Cambrian in the study areaare perfect regional covery rocks which may seal gas reservoir with more than 500m highgas column.There are three kinds of preservation area:1.Paloozoic bare zone;2.Meso-Cenozoic covering zone;3.The frontal zone of nappe structure.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1992年第3期332-343,共12页
Oil & Gas Geology
