论文详情
层序地层学是地层沉积解释的重要基础理论与方法。然而,在满足被动大陆边缘条件下,海相层序地层学在层序界面划分和解释方法上仍存在许多不同。尤其是对于不满足被动大陆边缘条件的陆相沉积,其陆相层序地层学理论在应用中更面临诸多挑战。此外,在局域三维地震资料解释时,如何正确理解和应用层序地层学理论与方法也存在很多值得探讨的问题。针对松辽盆地薄储层勘探、开发中的技术需求,特别是在地震资料的分辨率难以完全满足薄储层解释的情况下,充分利用三维地震数据和测井资料,聚焦薄储层研究目标构建储层相对等时面,并使之满足拟被动大陆边缘条件,从而建立其与层序界面的联系,为应用局域三维地震资料开展层序地层学解释创造必要条件。通过对沿顶部层序界面拉平的地震剖面和测井资料的解释,可获得局域古地貌、局域沉积中心、局域沉积物源等沉积信息。在此基础上,当两个相邻层序界面间的地层沉积环境满足拟被动大陆边缘条件时,应用空间相对分辨率理念,依据地震属性切片开展储层沉积演化解释,进而获得薄储层的沉积相和空间展布规律的认识。
Sequence stratigraphy provides an important theoretical framework for interpreting stratigraphic deposition.However,even in a passive continental margin in marine environment,many ambiguities in the division and interpretation of sequence boundaries are possible.When the passive continental margin condition is not met in a continental environment,the interpretation is even more problematic.In the interpretation of local three-dimensional (3D) seismic data,the correct application of sequence stratigraphy is also very challenging.To meet the needs of exploration and development of thin reservoirs in the Songliao Basin even with seismic data with insufficient resolution,3D seismic and logging data were fully exploited to construct the relative isochronal surface of the reservoir and identify a quasi-passive continental margin condition.In this manner,a relationship with the sequence boundary could be established,and a reference for the application of local 3D seismic data for sequence stratigraphy interpretation could be provided.By interpreting the seismic profile and logging data flattening along the top sequence boundary,sedimentary information such as local paleogeomorphology,local sedimentary centers,and local sediment sources could be obtained.Then,the concept of spatial relative resolution was applied to interpret the sedimentary evolution of the reservoir according to seismic attribute slices,and the sedimentary facies and spatial distribution patterns of the thin reservoir could also be obtained.