摘要
本文从区域古构造演变、断裂和低温热液矿分布、温矿泉以及伴生气特征、盖层和有机质变质程度等诸因素探讨了区内下古生界(包括震旦系)天然气保存条件。认为区内具备生气条件,但断裂发育,良好圈闭少。可以上震旦统灯影组为主要含气目的层。四望山-磺厂背斜带保存条件稍好,其中燕子岩背斜形成较早,圈闭较好,可进一步开展工作。
Abstract
Shangzhi-Shimen Region,with a total area of about 10000km,is situ-ated at the northwest margin of the Jiangnan Old Land.The basic struc-tural type is two depressions in the north and south and a uplift in be-tween.Start from north to south,it is composed of Taiqing shan-Hongjiaguan syncline zone,Siwangshan-Huangchang anticline zone and Dayong-Shimen syncline zone.The source beds are the Lower Silurian,Or dovician,Lower Cambrian,the Dengying and Doushantuo Formations of the Upper Sinian,the mainre servoir is the Dengying Formation.The fractures in this region are characterized by well developed combinedstriks of different directions and multi-stage activities.They are usually filled by low-temperature hydrothermal deposits,some of them have ther-mal springs accociated with nitrogen.All this may be harmfull to hydro-carbon preservation.The preservation condition of Siwangshan-Huangchang anticline zone is better,Yanzhiyan anticline,a part of the anticline zone,formed earlier than others and has favourable trap condition.
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