蛟河盆地白垩系石油地质特征及有利勘探区块预测

Cretaceous petroleum geological characteristics and prediction of favorable exploration targets in Jiaohe Basin

蛟河盆地是吉林省蛟河市境内的一个中生代断陷型盆地,由3个Ⅰ级构造单元(蛟北坳陷、蛟南坳陷、蛟东断坡)组成。盆地内广泛发育下白垩统奶子山组、乌林组及保家屯组。烃源岩地化特征分析结果表明其具有良好的生烃物质基础。从盆地构造特征、烃源岩以及储盖条件等方面对盆地石油地质条件进行了初步的评价。综合研究表明,盆地下一步油气勘探主要有利区块位于蛟北坳陷,其次为蛟南坳陷。

Jiaohe Basin was a Mesozoic rift basin in Jiaohe area of Jilin Province, which contained three firstorder tectonic units： Jiaobei depression, Jiaonan depression and Jiaodong ramp. The Cretaceous strata in this basin are the Lower Cretaceous Naizishan Formation, Wulin Formation and Baojiatun Formation, in ascending order. Analysis results of hydrocarbon source rock＇s geochemical characteristics confirmed that it had good material basis for hydrocarbon generation. A preliminary evaluation of petroleum geology was made considering structural characteristics, hydrocarbon source rocks and source-reservoir-seal associations of Jiaohe Basin, and these comprehensive results indicated that Jiaobei depression was the favorable target of next exploration and secondly was Jiaonan depression.