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渤海南部BZ34-9区与KL6区块位于莱北低凸起南北两侧,均发育新生代玄武岩并得到钻井证实,但储层特征差异明显.以三维地震、薄片、SEM以及X衍射等技术手段对两个区块玄武岩时空展布,沉积体系以及储层特征进行对比.研究表明,BZ34-9区构造位于缓坡带,供源速率中等.渐新世玄武岩为沉积期及准同生期喷发且位于砂体主体部位,优质层段形成白云石包壳、沸石胶结溶蚀、混层粘土包膜等成岩响应,整体对储层发育发挥积极作用;KL6区构造近物源,供源强烈,渐新世玄武岩发育在凹陷内部,对砂体影响有限,储层以高岭石及碳酸盐胶结充填为特征,在成岩期受郯庐断裂带岩浆热液影响,绢云母、菱铁矿重结晶等现象普遍.对比分析表明玄武岩对储层的影响受控于火山喷发时机、物源供给速率、砂体及火山岩配置关系等因素.
The BZ34-9 and KL6 blocks in the southern Bohai Sea are located on the north and south sides of the low Protuberance in the North of LaiBei, all of which are Cenozoic basalts and have been verified by drilling, but the reservoir characteristics are obviously different. By means of three-dimensional seismic, flake, SEM and X-ray diffraction The spatial and temporal distribution of basalts in the two blocks, sedimentary system and reservoir characteristics are compared.The results show that the structure of BZ34-9 is located in the gentle slope zone, and the source rate is moderate.The Oligocene basalts are the sedimentary and quasi-syngenetic eruptions It is located in the main part of the sand body. The dolostone inclusions, zeolite cementation dissolution and mixed clay coatings are formed in the high quality intervals, which play an active role in reservoir development. In the diagenesis period, the magmatic rocks are affected by magmatic hydrothermal fluids in the Tanlu fault zone, while sericite and siderite are recrystallized, etc. The phenomenon is common.Comparative analysis shows that the influence of basalt on reservoirs is controlled by the volcanic eruption timing, the source rate of supply and the relationship between sand body and volcanic rock configuration.