Progressive Exploration And Evaluation Of Complex Fault-block Oil Reservoirs In Minqiao Area,jinhu Sag

Minqiao tectonic belt E₁f₃ reservoir production is high,is the golden lake depression development benefit is one of the best areas,but little faults in the study area and its development,combination relationship is complex,phase change quickly,the reservoir plane change is big,there are still many difficulties and potential,this paper mainly aimed at the development stage of small layer fine contrast,sedimentary microfacies analysis technology,low grade sequence fault identification technique and technology of the complex anatomy of a detailed interpretation research study,combining the research on the laws of the hydrocarbon accumulation in this area,a comprehensive evaluation Minqiao regional advantageous area of rolling exploration and development,and to carry out the objective evaluation and selection.Based on the analysis of basic data,this paper analyzes and compares the drilling and logging data of all exploration Wells and development Wells in the study area,and carries out a fine anatomy of typical reservoirs and key display Wells in the area.The detailed interpretation of the 210km² three-dimensional earthquake in the research area was completed,and more than 80 basic maps including structural maps,sedimentary microfacies maps and reservoir profiles were completed.Through the research,the following main achievements and understanding are achieved:(1)Under the guidance of high-resolution sequence stratigraphy,the isochronal stratigraphic correlation framework of the study area was established.On this basis,the fine small-layer correlation of the main target layer E₁f₃ was focused,and the isopach map of sandstone of each oil-sands body was drawn with the single sand body as the research unit to clarify the spatial distribution characteristics of the main oil-sands bodies.(2)Based on the study of facies markers,the study of E₁f₃ sedimentary facies in the study area was carried out through the analysis of single well facies and well connection facies.According to the study,E₁f₃ in minqiao area is mainly subfacies deposition in the delta front,and the source of material is mainly from the jianhu uplift in the northeast direction.There are mainly underwater distributary channel,estuary bar,sheet sand and other sedimentary microfacies in the front.(3)Through the whole anatomy of Minqiao tectonic belt,and summarized the Minqiao structural belt in the plane and profile combination style,the tectonic framework of Minqiao tectonic belt,fracture pattern in the study area is complicated,with diverse style of fracture,including"reverse step","y"glyph,"white cabbage","flower",etc.,in the plane combination forms have parallel type,split type and diagonal plane combination mode.(4)Through detailed anatomic analysis of reservoir structure,reservoir and oil-water distribution characteristics,the types and enrichment rules of E1f3 reservoir in minqiao area are summarized.The type of reservoir is dominated by structural reservoirs,some of which are controlled by both structure and lithology.(5)Through the Minqiao region tectonic characteristics,reservoir characteristics and comprehensive research in aspects of oil and gas migration,summarized the funing group in the study area are the key factors for oil and gas enrichment,favourable tectonic setting controls the oil and gas migration and distribution pattern,fault sealing ability is one of the important factors of trap accumulation,reservoir development degree and physical conditions affect the oil and gas enrichment degree.(6)After systematic research,12 favorable rolling targets and 3 rolling well locations were submitted,among which min 48 and min 49 achieved success.