Application of seismic sedimentology in a fluvial reservoir: A case study of the Guantao Formation in Dagang Oilfield, Bohai Bay Basin, China,Geological Journal

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Application of seismic sedimentology in a fluvial reservoir: A case study of the Guantao Formation in Dagang Oilfield, Bohai Bay Basin, China
Geological Journal ( IF 1.4 ) Pub Date : 2021-08-05 , DOI: 10.1002/gj.4227
Hai Liu _{1,

2,

3} , Mian Zhang _{1,

2} , Xiaoming Chi ₁

Affiliation

A seismic sedimentology study was performed to analyse the complex fluvial reservoirs in the Neogene Guantao Formation in Kongdian Oilfield, Huanghua Depression. Three facies associations were identified by core and logging data, including bedload channel, mixload channel, and floodplain. Widely developed floodplain deposits beds were selected as the relatively reliable reference time surfaces. Stratal slices were generated applying the stratal-slicing principle on two isochronous reference seismic events in Kongdian Oilfield. These stratal slices were used to analyse the distribution of sediments in a relative geologic-time domain. The variety of sediment distribution observed on the stratal slices indicated that the fluvial channel systems of study interval had evolved from straight channel, sandy-braided channel to combined channel. Sediment dispersal patterns were controlled by the change of accommodation (A) and sediment supply (S) rate. Setting with a low A/S ratio favours the development of fluvial environment and high A/S ratio favours the development of floodplain. Braided channel sandstones formed in a low A/S ratio depositional environment were generally thought to be excellent reservoirs. However, the muddy plug could damage the lateral continuity of sandbody, impede the fluid flow, and reduce the water-injection efficiency.

中文翻译：

地震沉积学在河流储层中的应用——以渤海湾盆地大港油田馆陶组为例

通过地震沉积学研究，对黄骅凹陷孔店油田新近系馆陶组复杂的河流储层进行了分析。通过岩心和测井数据确定了三种相关联，包括床载通道、混合载荷通道和洪泛区。选择广泛开发的漫滩沉积床作为相对可靠的参考时间面。应用地层切片原理对孔店油田的两个等时参考地震事件生成地层切片。这些地层切片用于分析沉积物在相对地质时间域中的分布。在地层切片上观察到的沉积物分布的多样性表明，研究区间的河流河道系统已经从直线河道、沙辫状河道演变为混合河道。沉积物扩散模式由住宿 (A) 和沉积物供应 (S) 速率的变化控制。A/S比低的设置有利于河流环境的发展，A/S比高的设置有利于漫滩的发展。在低 A/S 比沉积环境中形成的辫状河道砂岩通常被认为是极好的储层。然而，泥塞会破坏砂体的横向连续性，阻碍流体流动，降低注水效率。在低 A/S 比沉积环境中形成的辫状河道砂岩通常被认为是极好的储层。然而，泥塞会破坏砂体的横向连续性，阻碍流体流动，降低注水效率。在低 A/S 比沉积环境中形成的辫状河道砂岩通常被认为是极好的储层。然而，泥塞会破坏砂体的横向连续性，阻碍流体流动，降低注水效率。

更新日期：2021-10-07

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