复杂断块油田单砂体级高分辨率层序地层特征——以呼和诺仁油田贝301区块南屯组二段为例

Characteristics of the high resolution sequence stratigraphy for the complex faulted block oil fields by single sand body rank——the second member of Nantun Formation in Bei 301 block of Huhenuoren Oilfield

单砂体级精细井间连通关系制约复杂断块油田的开发,以高分辨率层序地层学和现代沉积学为指导,综合应用钻井、测井、录井、地震及分析化验资料,建立海塔盆地呼和诺仁油田贝301区块南屯组二段(简称南二段)单砂体级高分辨率层序地层格架,刻画单砂体级沉积微相展布规律.结果表明:研究区南二段主要发育于扇三角洲前缘沉积环境,随着基准面的下降,水下分流河道的宽度和厚度增大;反之,水下分流河道的宽度和厚度减小.有利砂体主要分布在可容纳空间较小的中期基准面旋回附近.该研究成果为类似区块精细油藏描述提供有益参考.

To solve the precise interconnection relations of single sand bodies between the wells that restricted oilfield development of the complex faulted oil fields,this research is directed by the high resolution sequence stratigraphy and the modern sedimentological theory,comprehensive application of drilling,logging,seismic and analysis assay data,then first time build single sand body rank high-resolution sequence stratigraphic framework for the second member of Nantun Formation in Bei 301 block of Huhenuoren Oilfield in Haita Basin.Identify that it is on the fan delta front background,with the decreasing of the base level,the width of underwater distributary channel is increased and the thickness is thickened.With the rising of the base level,the width of underwater distributary channel become narrow and the thickness is decreased.Favorable sandbodies mainly developed in the little accommodate space that near the turnaround surface of MSC2.The study result and method provide beneficial reference for studying fine reservoir description in other region.