CAJ | 학술논문

基于300口钻遇火山岩层系的岩心及岩屑薄片、测井和地震等资料，依据火山地层学方法及地震火山地层学理论，通过火山地层界面识别，研究辽河盆地新生界火山喷发旋回和期次，对各个喷发旋回、期次火山地层进行平面成图，揭示火山活动时空规律；进一步结合火山地层分布与油气的关系，探究火山喷发旋回、期次的油气地质意义。结果表明：辽河盆地新生界火山岩系可划分为4旋回15期；底部旋回一和顶部旋回四为玄武岩，显示火山喷发以基性岩开始，又以基性岩结束；中部的旋回二和三均为玄武岩→粗面岩→玄武岩的岩性序列，构成本区火山地层的主体。火山岩受北东向主干断裂控制，最大厚度位于断裂带附近；早期(期次1至期次2)全区分布，末期(期次15)分布局限；中期(期次3至期次14)表现为喷发中心由北向南依次迁移特征。该结果提高了火山岩序列的纵向刻画精度，厘清了有利火山岩层系的空间分布，有助于寻找火山岩勘探新层系。以往辽河盆地火山岩勘探主要集中于沙三段中亚段粗面岩(期次5)，本次研究发现与粗面岩相邻的期次4、期次6、期次7玄武岩亦展现出良好的油气勘探前景，为下一步勘探指明了方向。
기우300구찬우화산암층계적암심급암설박편、측정화지진등자료，의거화산지층학방법급지진화산지층학이론，통과화산지층계면식별，연구료하분지신생계화산분발선회화기차，대각개분발선회、기차화산지층진행평면성도，게시화산활동시공규률；진일보결합화산지층분포여유기적관계，탐구화산분발선회、기차적유기지질의의。결과표명：료하분지신생계화산암계가화분위4선회15기；저부선회일화정부선회사위현무암，현시화산분발이기성암개시，우이기성암결속；중부적선회이화삼균위현무암→조면암→현무암적암성서렬，구성본구화산지층적주체。화산암수북동향주간단렬공제，최대후도위우단렬대부근；조기(기차1지기차2)전구분포，말기(기차15)분포국한；중기(기차3지기차14)표현위분발중심유북향남의차천이특정。해결과제고료화산암서렬적종향각화정도，전청료유리화산암층계적공간분포，유조우심조화산암감탐신층계。이왕료하분지화산암감탐주요집중우사삼단중아단조면암(기차5)，본차연구발현여조면암상린적기차4、기차6、기차7현무암역전현출량호적유기감탐전경，위하일보감탐지명료방향。
The volcanic cycles and stages in the eastern sag of Liaohe Basin were studied to identify interfaces inside the Ceno-zoic volcanic formations using volcano-stratigraphic methods and seismic volcano-stratigraphy theories. Drilling cores and thin sections from 300 wells were analyzed and interpreted by combining well loggings and seismic profiles. The spatial distribution of volcanic activities was revealed by mapping the volcanic formations of each cycle and stage. The relationship between oil and gas bearing layers and volcanic formations was analyzed to discuss the significance of volcanic cycles and stages to hydrocarbon accumulations. The results suggest that the Cenozoic volcanic formation in the Liaohe Basin is divided into 4 cycles and 15 sta-ges. The 1st cycle at the bottom and the 4th cycle at the top are composed of basalts, which indicates that the Cenozoic volcanic activities began and ended with mafic magmas. The Cenozoic volcanic formation is dominated in the 2nd and 3rd cycle, and these two cycles show the same lithologic sequence from basalt to trachyte to basalt. The distribution of volcanic rocks is con-trolled by major faults of northeast orientations, and the maximum thickness of volcanic rocks is mainly along the fault zone. Volcanic rocks in the early stage 1 and stage 2 were widely spread in the whole sag, while the basalts in the final stage 15 are limited, and the distribution center of volcanic rocks from stage 3 to stage 14 migrated from north to south. By means of division and correlation of the volcanic sequences, the spatial distribution of the favorable volcanic stages is revealed in order to discover new hydrocarbon bearing volcanic formations for the future exploration. Previous targets are primarily on the trachytes of stage 5 in the 3rd Member of Shahejie Formation, however significant hydrocarbon accumulations have been also found recently in the basalts of the adjacent stage 4, stage 6 and stage 7, suggesting a promising future exploration in this area.