莱州湾凹陷垦利10-1油田火山岩识别与分布预测

Recognition and distribution prediction of volcanic rocks in Kenli 10-1 oilfield of Laizhouwan Sag

渤海湾盆地莱州湾凹陷垦利10-1油田沙三中亚段发育了较大规模的火山岩(古近纪),影响了油藏的分布。所钻遇火山岩的录井资料表明,该油田火山岩以玄武岩、安山岩为主。文章综合利用测、录井及地震资料,对研究区内火山岩进行了识别,确定了它们的识别标志;利用均方根振幅属性对火山岩的高值响应,结合火山岩单井钻遇情况,对研究区火山岩空间分布进行了可靠的限定,明确了该层位火山岩平面、剖面及三维分布规律。综合火山岩岩性、产状及空间分布特征,确定研究区内火山岩为沿莱北断层裂隙式喷发形成。该研究成果为油田勘探开发中的井位部署提供了指导依据,对于深层火山岩的识别也具有参考价值。

Volcanic rocks have erupted after the formation of reservoir in the middle submember of the third member of the Shahejie Formation in Kenli 10-1 oilfield of the Laizhouwan Sag,Bohai Bay basin.To reduce the risk in exploration drilling,the recognition and distribution prediction of volcanic rocks in the middle submember of the third member of the Shahejie Formation in the oilfield are studied.Lithology logs from this interval manifest that basalt and andesite are the dominant volcanic rocks in this area.Wireline logging,mud logging and seismic data are integrated to identify the volcanic rocks by analyzing the well logging and seismic response.High root mean square（RMS）amplitude corresponds to volcanic rocks and is used to depict the spacial characteristic of the rocks when combined with the information from wells.On this basis,the plane,profile and 3-D distribution of the volcanic rocks and their evolution are demonstrated.Comprehensively considering the lithology,shape,orientation and special distribution of volcanic rocks in the area,a fissure eruption model along the Laibei fault for the volcanic events is built.These results will provide professional guide for the well position design in the following exploration and production stage of the Kenli 10-1 oilfield,and are valuable for the recognition of volcanic rocks at deep levels.