论文部分内容阅读
储层内部建筑结构是评价油气藏、改善水驱开发效果、提高油气采收率的基础和关键。因此,文章以华庆地区长63层水下分流河道为例,利用野外露头照片和连井剖面等资料,应用petrel软件,系统建立了华庆地区长63储层构造模型和储层参数(孔隙度、渗透率和泥质含量)模型。研究结果表明,三角洲前缘水下分流河道构型界面可划分为5级:其中5级为同期水下分流河道复合砂体的界面,4级为水下分流河道单一砂体的沉积界面,3级为水下分流河道单一砂体内部增生体的界面,2级为增生体内部简单的层系组界面,1级为增生体内部单个交错层系的界面。研究区砂体内部存在侧积夹层、前积夹层和垂积夹层3种类型的夹层。建立的研究区长63构造模型总体趋势为西低东高。从孔隙度、渗透率和砂泥岩分布模型图可以看出研究区属于低孔特低渗储层。结构解析结果客观的反映了长63储层内部基本单元的展布形态,真实再现了研究区内部砂体的空间形态分布模型图。
The internal structure of reservoirs is the basis and key to evaluate reservoirs, improve the effect of waterflood development and increase oil and gas recovery. Therefore, taking the 63-layer underwater distributary channel in Huaqing area as an example, using the petrel software and the data of outcrop photos and continuous well profiles in the area of Huaiqing, the Chang 63 reservoir model and reservoir parameters (porosity Degree, permeability and shaliness content) model. The results show that the delta front distributary channel interface can be divided into five levels: five of which are the interface of the submerged distributary channel complex sand body, the fourth is the sedimentary interface of the single sand body of the submarine distributary channel, and 3 Level is the interface of single sand body internal proliferation body in underwater distributary channel. Level 2 is the simple layer system interface in the body of the hyperplasia, and level 1 is the interface of the single staggered layer system in the proliferation body. There are three types of interlayer in the sand body in the study area, ie, the lateral sedimentary layer, the fore-sedimentary layer and the vertical sedimentary layer. The overall trend of the established study area 63 structural model is west low and east high. It can be seen from the porosity, permeability and sand-shale distribution model that the study area belongs to the low-porosity and ultra-low permeability reservoirs. The results of structural analysis objectively reflect the distribution patterns of basic units in Chang 63 reservoir and truly reproduce the spatial pattern of sand bodies in the study area.