浅水三角洲相多期窄河道砂体结构研究——以渤海海域渤中25-1南油田为例

摘要/Abstract

摘要： 多期窄河道砂体结构研究一直以来是渤海油田开发中急需解决的难题之一。以渤中25-1南油田为例，在砂体构型研究理论的指导下，利用现有钻井、测井、地震及野外露头等资料，明确了浅水三角洲砂体的地质模式，建立了精细地层格架。通过利用钻井剖面上间断的分流河道间砂体、分流河道砂体顶面高程差异、分流河道砂体沉积规模差异等3种单井对比模式，结合波幅变化、出现复波等地震响应特征，井震结合分析单期河道砂体的储层结构，划分出单期河道砂体。研究表明，单期窄河道砂体厚度与砂体宽度呈对数相关，平均宽厚比为35。单期河道砂体宽度为200～400m，延伸范围可至整个工区。研究成果有效指导了油田优化注水、产液结构调整及井网部署，为油田开发打下了坚实的地质基础。

关键词: 窄河道, 多期河道, 单砂体, 储层结构, 渤中凹陷

Abstract: Architecture of multiphase narrow-channel sand bodies has always been one of the subjects to be urgently defined in development of the Bohai oilfield. Taking the BZ25-1S oilfield as an example, guided by the theory of sand body architecture, available data (e.g. drilling, well logging, seismic and outcrop) were used to ascertain the geologic model of shallow water deltaic sand bodies, and the fine stratigraphic framework was established. By applying three types of single well correlation models (i.e. discontinuous distributary interchannel sandbody, elevation difference of the distributary channel sandbody tops, and difference in scale of distributary channel sandbody deposits) on drilling profiles, together with some seismic response features (e.g. wave amplitude variation and complex wave occurrence), well data and seismic data were combined to analyze the reservoir architecture of single-phase channel sand bodies, and the single-phase channel sand bodies were classified. The study results indicate that the thicknesses of single-phase narrow-channel sand bodies have logarithmic correlation with the widths of these sand bodies, with average width/thickness ratio of 35. The widths of single-phase narrow-channel sand bodies are 200-400 m, and they can extend across the whole study area. These study results have been adopted as effective guidance for oilfield water injection optimization, liquid producing structure adjustment and well pattern arrangement, laying a solid geologic foundation for oilfield development.

Key words: narrow-channel, multiphase channel, single sand body, reservoir architecture, Bozhong sag

李超, 韩雪芳, 胡勇, 周军良, 闫涛. 浅水三角洲相多期窄河道砂体结构研究——以渤海海域渤中25-1南油田为例[J]. 中国石油勘探, 2016, 21(6): 43-49.

Li Chao, Han Xuefang, Hu Yong, Zhou Junliang, Yan Tao. Architecture of multiphase narrow-channel sand bodies of shallow water deltaic facies: A case study on BZ25-1S oilfield[J]. China Petroleum Exploration, 2016, 21(6): 43-49.

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