摘要
川东石炭系的天然气勘探已经四年,除早期连续发现了相国寺等四个气田和一个含气构造外,近两年来勘探成效不大。为探求油气富集规律,谨写此文,以期对勘探能有所裨益。
Abstract
Carboniferous system of east Sichuan are dominantly a suit of intertidalsupratidal dolomites,breccia dolomites intercalated with limestones. They had locally developed into porous zones due to pre-Permian erosion. In recent years,several gas fields were found there,but failures often appeared in exploration. The author suggests that the key point of gas enrichment depend upon reserve and trap conditions,the frequent movements of the earth crust and the abundant rifts there played an important role in controlling the migration and accumulation of gas. It is believed that various traps formed at two sides of wide synclines which are interrupted by upthrow faults of related high anticlines are the most potential parts for gas enrichment,and Chixi and Mennan fault-traps are favourable ones.
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