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| 辽河盆地新生界火山喷发旋回和期次及其油气地质意义 |
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冯玉辉1,于小健2,黄玉龙1,刘宝鸿3,顾国忠3,李涵月4,王璞珺1
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(1.吉林大学地球科学学院,吉林长春 130061;2.中国人民武装警察黄金部队第一支队,黑龙江牡丹江 157021;3.中国石油辽河油田分公司勘探开发研究院,辽宁盘锦 124010;4.中国石油辽河油田分公司钻采工艺研究院,辽宁盘锦 124010)
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| 摘要: |
| 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。 |
| 关键词: 辽河盆地 新生界火山岩 火山地层 旋回 期次 |
| DOI：10.3969/j.issn.1673-5005.2015.05.007 |
| 分类号::TE 122.222 |
| 基金项目:国家“973”计划项目(2012CB822002);国家自然科学基金项目(41472304,5);中国石油天然气股份有限公司科学研究与技术开发项目(2012E-3001) |
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| Eruption cycles and stages of Cenozoic volcanic rocks and their significance to hydrocarbon accumulations in Liaohe Basin |
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FENG Yuhui1, YU Xiaojian2, HUANG Yulong1, LIU Baohong3, GU Guozhong3, LI Hanyue4, WANG Pujun1
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(1.College of Earth Sciences, Jilin University, Changchun 130061, China;2.Gold Headquarters of CAPF, Mudanjiang 157021, China;3.Research Institute of Liaohe Oil Company,CNPC, Panjin 124010, China;4.Drilling and Production Technology Research Institute of Liaohe Oil Company, CNPC, Panjin 124010, China)
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| Abstract: |
| The volcanic cycles and stages in the eastern sag of Liaohe Basin were studied to identify interfaces inside the Cenozoic 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 stages. 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 controlled 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. |
| Key words: Liaohe Basin the Cenozoic volcanic rocks volcano-stratigraphy cycles stages |
