垦东滩海地区浅部储层精细描述
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摘要
我国东部滩海地区浅部具有地震采集条件差、资料品质低、储层岩性变化大、砂泥和泥岩难以区分等缺点,导致储层描述较为困难。为了解决这一问题,以垦东滩海地区为例,通过井震结合,形成了"合成地震记录标定、地震反演追踪、属性提取查明"的储层精细描述方法。在具体描述时,先将环境校正后的合成地震记录与井旁地震道相位、能量准确对比,从而标定储层;同时进行测井约束下的地震反演,从而实现砂岩储层的横向追踪;并通过均方根振幅属性提取,明确储层的平面分布。储层描述发现,垦东滩海地区馆陶组IV砂组储层呈SN向条带状分布,显示曲流河沉积特征。
The shallow reservoirs in the beach area of east China are characterized by poor seismic acquisition conditions,low seismic data quality and drastic change in lithology.Its hard to distinguish sand and shale,and thus difficult to make reservoir description.In this paper,we took the Kendong area as an example to try to solve these problems and proposed a set of methods for reservoir fine description.Based on calibration of synthetic seismogram,we trace the records by seismic inversion and prove the interpretation by attribute extraction.Firstly,the reservoir was calibrated by comparison of the phase and energy of synthetic seismogram after environment correction with the seismic information from the nearby wells.Then seismic inversion was carried out under the constraint of logging data to achieve the lateral tracking of sandstone reservoir.Last but not least,we definite the plane distribution of the reservoir via the extraction of root mean-square amplitude attribute.Through the reservoir description mentioned above,we found that the reservoir in the IV sands group of the Guantao Formation is a banded sand body,gradually thinning out from north to south.It is a typical deposit of a meandering river.
引文
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