The Study On Dongying Formation, Suqiaonan Oilfield Architecture Analysis Of Meandering River Reservoir

In recent years,exploration for shallow wenan slope has achieved fruitful results in drilling and research.In the basic petroleum geological conditions and oil and gas accumulation law has done a lot of research work and made a certain understanding.At the same time,large-scale structural reservoirs in the Wen'an slopes have also been explored.However,the existing resource evaluation results show that the remaining resources in the Wen'an slope are still sufficient and have great exploration potential.Due to the narrow seismic data band and the lack of research on sedimentary reservoirs in high-precision sequence grids,there are still many inaccuracies in the research of reservoir prediction technology and favorable sand body distribution,there is still great difficulty in the identification and implementation of lithologic traps.In order to accurately assess the trap,it is necessary to improve the resolution of the seismic data and conduct a detailed study of the sedimentary reservoir to achieve the identification of the sand body in the earthquake and the implementation of the concealed trap.This paper is aimed at the meandering fluvial river reservoir of Dongying Formation in Suqiaonan Oilfield,follow the technical route of“grading restrictions,digital simulation,multi-dimensional interaction”basic idea,based on high resolution sequence stratigraphy and the results of seismic inversion and the physical and chemical data of the wells,study on the characteristics of reservoir structure about study area in the digital chemical industry zone of the dense well network.The establishment of a fine isochronous stratigraphic framework was carried out,and a series of related researches such as sedimentary microfacies and a single meandering belt were successively carried out,which laid the foundation for the later development of the oilfield.Research indicates:?1?The Dongying Formation stratigraphy is widely distributed throughout the region,and the sedimentation is relatively continuous.Although some of the strata are thickened due to the channel undercut,it is generally nearly equal thick vertical accumulation.?2?Based on the regional sedimentary background,core analysis data and well log shape analysis,it can be clarified that the Dongying Formation in the Suqiaonan area is dominated by braided river sediments at Ed₃ and gradually developed into meandering river sediments.And identified four basic structural elements in the study area,namely rivers and dams.Overflow sand and flooding sediment.Among them,point dams and flood plains are the most developed.?3?The distribution pattern of composite channel sand bodies in the target interval of the study area can be divided into four types:single strip sand body,multiple interlaced sand bodies,contiguous sand bodies and isolated sand bodies,and each type of sand body changes in plane phase.The characteristics of the characteristics are different,and the Ed₂³and Ed₂⁴sand bodies are most developed and distributed widely,and are distributed in a flaky manner.