North Second District Of East Gaotaizi Distribution Of Remaining Oil

The study of Residual oil is present important and difficult in high water cut and oil recovery stage. In this paper, developed nearly 50 years now in three combination of encryption and enhanced oil recovery pilot phase of the Second District Sabei area north east Gaotaizi oil group study, used the point of high-resolution sequence stratigraphy and sedimentary theory to divide target stratum with the deposition time units, contrast and establish the unified stratigraphic framework.On this basis, fully integrated logging geology, reservoir geology and petroleum geology, carried out with high water content of residual oil is forecast to be objective of reservoir heterogeneity and flow units, and the remaining oil distribution of the study area for detailed study.In this article,the target zone is a complex layer of delta front facies, the recognition of single-space sand, fine characterization and it's difficult to analysis the cause. So,this article is based on the area of core, drilling, logging and other features with high-resolution data, combined with the background of the deposition in this area, established a research area of micro-facies and depositional model; take full advantage of Well of three encryption, the study purpose of a single layer of fine sand-level classification,contrast,establish high-resolution stratigraphic framework of all area; through the relationship between lithology and electrical, set up log-phase mode, and then layer by layer by the conduct of the single well well The fine micro-identification,at last phase combination of plane, draw time unit flat sedimentary facies map. In the basis of sedimentary facies, research the deposition time of each unit of reservoir heterogeneity and flow units and through geological modeling directly reflect changes in reservoir properties and characteristics of oil changes. through the Flooding conditions on the analysis of the study area, combined with the results of these studies in the area of remaining oil distribution of the study area for detailed study.Through the detailed study in the area of Gaotaizi reservoirs, obtaineda series of research results. 1) G II 19 can be divided into small layer, it will be the first time of small Gâ…¡19 layers divided into Gâ…¡19a and Gâ…¡19b two time units in the area. Gaotaizi reservoirs deposition time can be divided into 49 units. Gaotaizi reservoirs and the region of 135 wells in 49 deposition time units were fine deposition time unit, unity contrast.So Established the vertical high resolution sequence stratigraphic framework.2) In the study, the energy unit was established 17 categories of log-phase mode, for the foundation of further detailed study in single sand body3) First identified the abandoned channel in the area, have a significant impact on distribution of the remaining oil.4) In the study of reservoir heterogeneity,based on the actual situation in the interlayer region,divided into six categories:mezzanine area, inter-layer insulation layer for the area, no compartment area, the effective thickness of the inter-zone between the area and the sheet sandstone Inter-district sandstone. Further deepening of the district development Gaotaizi reservoir compartment knowledge of the situation..5) According to the flow transmission coefficient and the net gross ratio,the subdivided mobile unit into five types.one type represents the corresponding sandstone reservoir porosity and permeability and the power of storage. At the same time Can be seenthe distribution of flow units can be seen with small cell micro-layer deposition time in good agreement with the distribution. In the area to take further confirmed the rationality of this classification method6) Combined with micro-fine sand with single-level research results, summarized four kinds of residual oil types:abandoned channel block-based oil, imperfect relationship between injection type remaining oil, well not control the remaining oil-based, low-permeability layer shielding or Sand the edge of the main type of remaining oil. And predicted its time unit, single sand body, parts, etc.