Bohai Bay Basin S Oil Field?region Dong 2 Reservior 3D Geological Modeling And Well Pattern Adaptability Evaluation

?Region of S Oilfield has been in development since 1993,and is currently in the stage of medium and high water cut development.During development and production,a series of problems such as poor water driving and large interlayer interference are gradually exposed.The interlayer is developed,the heterogeneity is strong,and the geological situation is very complicated,which brings great difficulties to the accurate identification and lateral prediction of reservoir sand bodies.It is necessary to systematically analyze the reservoir characteristics in this area and reasonably predict the reservoir Distribution to guide the next step of production development in the study area.In response to the problems gradually exposed in the oil field,this study used high-resolution sequence stratigraphy and sedimentology as guidance,based on the actual data of 115 wells in the study area,and completed the Suizhong 36-1 oil field based on sedimentary cycles.The stratigraphic fine division and unified comparison of the time unit level of the Dong 2 oil reservoir make it clear that the Dong 2 oil reservoir of the study area is braided river delta facies,and then determine the type of sedimentary facies ? microfacies in the research area and establish the sedimentary facies of the research area In the microfacies mode,the sedimentary microfacies distribution map at the unit of deposition time was drawn.Based on the aforementioned research results,the Petrel modeling software was used to establish a three-dimensional structural model,sedimentary facies model and reservoir parameter model in the study area,which accurately predicted The three-dimensional spatial distribution of the underground reservoir finally analyzed the adaptability of the 175m×250m well pattern in Suizhong 36-1 oilfield through sand body size prediction and limit well spacing analysis.The main completed research work is to establish a high-resolution stratigraphic framework up to the level of a single sand body,and the Dong 2 oil reservoir of the study area into 26 sedimentary time units;then the braid is cleared through sedimentary background investigation and core core analysis of the study area delta facies deposition,and identified 5types of sedimentary microfacies,subdivided 11 types of energy units,based on which the corresponding logging facies model was established,and the distribution of sedimentary microfacies in 26 deposition time units was drawn;application Petrel modeling software completed the structural modeling of the 26 sedimentary time units containing fault modeling in the lower section of the Dong 2 oil reservoir of the study area.Based on the actualgeological characteristics of the study area,the“phase control conditions”combining the advantages of deterministic and random modeling were developed.The “ Sequential Instruction Method”establishes the sedimentary facies model of the second member of the Dong 2 oil reservoir,and uses the sedimentary facies model as the framework to simulate and assign the physical property parameters of the uphole reservoir to the established three-dimensional grid system through variation function analysis.This completes the attribute modeling work;then the geological reserves of the target layer in the study area are calculated by the volume method;according to the above research results,the statistics of the river channel and estuary dam sand bodies are calculated And width,combined with technology critical spacing and economic analysis of critical spacing finalized reasonable well for the study area,provides some guidance to develop a reasonable development plan for the Suizhong 36-1 oilfield.