Reservoir Architecture Characteristics Of Delta Front Of Pu I Oil Group In Block 4, Pubei Area

Most oil fields in China has entered a stage of high water cut stage, there is a comprehensive high moisture content, a high degree of recovery, the high production rate, the low reserve-production ratio, the problem of low recovery. Reservoir flooded a large area plane, and the remaining oil distribution is very complex, analysis is difficult, the development of the reservoir from an early target group of small-to medium-term as well as single-layer, single sand body, mining has been the main contradiction in the contradictions between layers into a layer of sand body and the internal contradictions in the construction of the contradiction between the structural unit.In this paper, the integrated application of different scales of geological and geophysical data, through the fine anatomy of the four block Pubei Portuguese I Group reservoir geology and development of the characteristics of static and dynamic in order to study the combination of the main line, has done a major study of the following points:Firstly, the parameters of the core of statistics and observation results show that the main causes of reservoir sand body for underwater distributary channel and front sheet sands, sand body in the reservoir characteristics of the basis of further study, the establishment of a reservoir depositional model.Secondly, using methods of structural analysis of reservoir levels Pubei completed a four-block narrow thin sandstone reservoirs of different causes of the spatial structure of sand body analysis. The results showed that the four block reservoir Pubei sandbody part of the six independent structural unit, the other part of the broader distribution of the horizontal, the larger the thickness of thick sandstone reservoir structure for more than six overlapping vertical shear, horizontal lace made in the vertical and horizontal single causes can be further broken down sandbody.Thirdly, the integrated application of different scales of geological and geophysical data, carried out on the reservoir layer, interlayer, flat and micro-heterogeneity analysis and evaluation. Studies have shown that Pubei sandbody reservoir layer the degree of non-homogeneous medium-low, while the horizontal extent of the non-homogeneous medium-strong.Fourthly, on the mezzanine of the spatial distribution characteristics and attitude to carry out a comprehensive study, the study area the thickness of layers of laminated smaller, frequency and low frequency, the horizontal distribution of limited scope, the majority of the distribution was patchy and not more than one well spacing, a small number of wells from up to two, and the horizontal extension of the scope of the above can be up to three wells from the deposition of the laminated unit is extremely rare.Fifthly, the structure of the reservoir space research and the production of a combination of dynamic data to carry out the reservoir with the remaining oil in the spatial structure of the relationship between the formation of research, that the spatial structure of the level of the reservoir heterogeneity of the formation of residual oil is an important control factor, especially within the thick oil layer laminated to its internal formation of the remaining oil to have a more direct impact. Further pointed out that the embedded single sand body on the causes of anti-dumping tip zone, the vertical stack type erosion cut single cause of connectivity sandbody alone causes the space docking sandbody block layer of the separated parts of the remaining oil-rich region, while when there is oil corresponds to the relationship between injection and production, oil well drilling the internal instability in case of dissection of the reservoir above the oil-rich region is also the residual.