长白坳陷白垩系火山岩储层特征

Study on Features of Cretaceous Volcanic Reservoir in Changbai Depression

长白坳陷是一个典型多旋回叠合型盆地,蕴藏数量可观的油气资源。基于30余口探井资料、煤田钻井的地质及测井资料和145块岩石样品的测试结果,结合火山岩岩相图和产能资料分析,系统研究了长白坳陷白垩系火山岩储层特征及其影响因素。综合分析认为,长白坳陷的有利储层主要发育在断裂交汇部位、火山口—近火山口相带中爆发相的火山碎屑岩及凝灰质砂岩岩层中。研究为综合评价长白坳陷有利火山岩储层提供了一定的依据。

Changbai Depression is a typical multicycle superimposed basin,where considerable petroleum resources may be contained. Based on data of more than 30 exploration wells,geologic and well logging data of coal drilling and test results of 145 rock samples,combined with volcanic lithofacies diagram and productivity data analysis,this paper systematically studied the features and influential factors of Cretaceous volcanic reservoir in the Changbai Depression. It was believed through integrated analysis that the favorable reservoir of Changbai Depression was mainly developed in the intersection part of faults and the explosive facies volcaniclastic rock and tuffaceous sandstone of crater- near- crater facies belt. This study has provided some bases for the integrated evaluation of favorable volcanic reservoirs in the Changbai Depression.