Sedimentary evolution and controlling factors of Ⅴ Oil Group in the lower Minghuazhen Formation of Neogene in Kenli 6-A Oilfield, Bohai Sea, based on 3D isochronous stratigraphic slicing
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摘要:
新近系明化镇组下段Ⅴ油组是目前渤海浅层勘探开发重点层系之一，该时期广泛发育浅水三角洲沉积，但对其沉积演化规律及控制因素缺乏系统研究，导致对砂体空间展布认识不清，制约了砂体连通性分析及开发井位部署。以渤海垦利6-A油田为研究区，基于地震、钻井、测井等界面特征的识别，首先将明化镇组下段Ⅴ油组细分为5个亚油组，相当于4个四级层序，建立了等时层序地层格架；再以此为约束基于高度等时的三维地层切片技术揭示了Ⅴ油组沉积演化规律：早期Ⅴ-5亚油组发育大型分流河道，河道宽度＞1 km，最宽达2 km；Ⅴ-4亚油组最大湖侵期发育小型分支水系，宽度约80～300 m；Ⅴ-2、Ⅴ-3亚油组发育中型河道（河道复合体），宽度100～2 600 m；晚期Ⅴ-1亚油组大型河道与小型河道共生，大型河道宽度＞1 km，小型分流河道宽度为90～280 m。Ⅴ油组沉积演化及砂体空间展布主要受古地貌和层序共同控制，有序分布：平面上不同地貌单元控制河道规模，其中，大型河道主要分布于Ⅴ-1、Ⅴ-5沉积期的洼槽区，中型河道分布于Ⅴ-2、Ⅴ-3沉积期的断阶根部，小型分支水系主要分布于较高部位；垂向上层序控制了河道演化，其中，大型河道主要发育于二级或三级层序底部，中型河道主要发育于四级层序底部和顶部，小型分支水系则发育于四级层序湖侵面附近。预测研究区Ⅴ-1期大型河道发育潜在有利砂体，这将有效指导后续开发部署和井位优化调整，并丰富对渤海新近系浅水三角洲沉积模式的认识。
Abstract:The Ⅴ Oil Group of Kenli 6-A Oilfield in the lower Minghuazhen Formation (MF) of the Neogene is one of the key strata for shallow exploration and development in the Bohai Sea. The MF features shallow water delta deposits widely developed. However, systematic research on its evolution and controlling factors lacks, leading to poor understanding of the spatial distribution and connectivity of sand bodies. Based on the interface identification of seismic, drilling and logging, the Ⅴ Oil Group could be divided into five subgroups corresponding to four fourth-order sequences, based on which a high-precision sequence stratigraphic framework was established. The sedimentary evolution of the Ⅴ Oil Group were reproduced by high-precision isochronous three-dimensional stratigraphic slicing, showing characteristics of large distributary channels in the early Ⅴ-5 subgroup, small distributary channels in the maximum invasion period in the Ⅴ-4 subgroup, the medium-scale channels (channel complexes) in the Ⅴ-2 and Ⅴ-3 subgroups, and the co-existence of large channels and small channels in the late Ⅴ-1 sub group. The sedimentary evolution and sand body distribution were mainly controlled by the paleogeomorphology and stratigraphic sequence and distributed in an orderly manner. Different paleogeomorphology units on the plane controlled the scale of the channel. The large channel distributed mainly in the depression area during the Ⅴ-1 and Ⅴ-5 periods, the medium channel distributed in the root of the fault terrace during the Ⅴ-2 and Ⅴ-3 periods, and the small distributary channel distributed in the higher part of the sequence. In the vertical direction, the sequence controlled the change of channel, in which large channels developed at the bottom of the second- or third-order sequence, the medium-scale channel developed at the bottom and top of the fourth-order sequence, and small distributary channel developed near the fourth-order transgressive surface. It is predicted that the potentially favorable sand bodies are large channel deposits in the study area, which will effectively guide the subsequent exploration deployment and well location optimization, and enrich the understanding of the sedimentary model of the Neogene shallow-water delta in the Bohai Sea.
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Key words:
- stratigraphic slicing /
- Bohai Sea /
- Neogene /
- Ⅴ Oil Group /
- shallow water delta /
- sedimentary evolution
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