基于分频RGB融合技术和水平井信息的辫状河储层构型研究——以C油田馆陶组为例

渤海海域C油田馆陶组Ⅲ油组油藏为厚层块状辫状河沉积,油田采用天然能量驱的水平井开发,基于不同级次储层构型单元精细表征所揭示的单一成因砂体及其渗流屏障空间分布是提高油田开发效果的关键。基于油田稀井网的资料条件,论文采用三维地震资料分频RGB融合技术,开展不同级次辫状河储层构型单元和边界的地震响应分析,在水平井储层构型单元精细解释的标定下,实现了C油田馆陶组Ⅲ油组辫状河储层构型单元的剖面结构和平面分布的精细刻画。C油田馆陶组主要发育心滩和辫状河道两种类型四级构型单元,试验表明,优选30 Hz、45 Hz和65 Hz分频体进行RGB融合,能够有效揭示不同构型单元的厚度平面变化并准确探测构型单元的岩性和物性边界。分频RGB融合效果显示心滩主要呈亮红色,辫状河道主要表现为淡绿色和蓝色,在剖面上二者多为心滩-辫状河道-心滩侧向拼接关系,平面上辫状河道环绕心滩分布。油藏的四级储层构型单元以心滩为主,物性好,平面上呈NEE-SWW向分布,单一心滩宽1500~2000 m,长2000~3500 m。辫状河道岩性变化较大,储层物性相对较差,四级构型单元宽100~300 m,平面上呈窄条带状将心滩分割,成为不同心滩之间的渗流屏障。基于分频RGB融合和水平井信息的辫状河储层构型单元刻画,提高了提取地质体和探测边界的能力,系统地将岩性-厚度-构型的关系耦合起来,实现了C油田稀井网条件下辫状河储层构型的精细刻画,为油田综合调整方案的制定、提高油田开发效果提供了直接的地质依据。

A New Method base on Water Drive Curve for Determining the Reasonable Injection-Production Ratio for High Water-Cut Oilfield

The Injection-production Ratio plays a very important role in the high water cut stage in oilfield development. If the Injection-production Ratio is unreasonable, this will result in serials problems, such as sever water breakthrough in high permeable layers, decrease on the water injection effectiveness and water sweep efficiency, serious depletion of reservoir, etc.

A Re-recognition of Hydrocarbon Accumulation Regularity in the Middle-late Stage of Reservoir Development:a Case Study from NB35-2 Oilfield in Bohai Bay Basin

According to the contradiction between production and geologic cognition in NB35-20ilfield, Bohai Bay Basin, palaeogeomorphology, depositional feature and reservoir forming model have been re-analyzed, as well as the resource potential. In order to study the petroleum geology of NB35-2 oilfield, various kinds of information, such as seismic data, well logging data, drilling cores and production performance data are well analyzed.