Abstract
In 1984 a special type of oil field was discovered in the Songliao basin, a major oil production province in northern China. The oil field, different from all known types, was formed in a source claystone with fissured intervals. The Qingshankou source rock was composed of thick clay sediments, without any internal porous interbeds. The fissures developed later than deposition in this clay section. Since 1984 several wells have penetrated the Qingshankou source clay and 12 have found oil pools of the same type. This new type of oil trap is named a fissured clay reservoir. Discovery has been not only of commercial interest, but has also provided a significant impetus to developments in petroleum geology science.
Get full access to this article
View all access options for this article.