松辽盆地南部万金塔二氧化碳气田的地质特征及其成因

GEOLOGICAL FEATURES OF WANJINTA CO FIELD IN SOUTH SONGLIAO BASIN

裘松余 钟世友

Qiu Songyu Zhong Shiyou

五十年代末至六十年代初,经航磁、重力、电法和地震等综合勘探,在松辽盆地东南隆起区德惠凹陷西缘,发现和圈定了万金塔构造(图1)。1964年和1977年,石油工业部先后施工万和万井,1978—1983年,地矿部相继施工万、万和万井,均见 CO气喷;其中,万、万、万三井获得工业性 CO气流。据测试日产量约为20000～130000立方米,气样分析结果 CO占84.5—99.8%。该气田储量大、纯度高、埋藏浅,具有开发价值。

Wanjinta CO field is located on the western margin of Dehui depression,Songliao Basin.The gas pooled in the Middle Cretaceous Quantou Formation,and is trapped in anticline and stratigraphy-fault-aticline complexities.Thewell yield is more than 20,000m of gas per day.The gas comprises 84.5-99.8% of CO and a little hydrocarbons.Eachgas pool has its own specific hydrodynamic system.Due to its gravity differ-entiation,the content of hydrocarbon decreases and that of CO increases withdepth.The reserve of gas field is quite voluminous and productive.On the ba-sis of δC value and regional condition,it is suspected that CO was de-rived,and then concentrated,from magmatism.The Early Cretaceous vol-canics to which the Well Wan-5 penetrated more than 939m thick.

10.11743/ogg19850417