Study On Logging Evaluation Method Of Fuyu Oil Layer Of Dense Reservoir Sanzhao Sag Of Songliao Basin

At present,the Daqing Oilfield enters the stage of high water late stage,and the remaining recoverable reserves of the oil field are gradually reduced.As a substitute energy,the tight sandstone reservoir is gradually becoming the key exploration object.The Fuyu reservoir is the main production layer of the oil composition in the lower part of the Sanzhao sag,which is also the focus of the unconsolidated reservoir sandstone oil exploration in the Songliao Basin.It has the advantages of low permeability,low oil flow,Low stability,low abundance of reserves and poor stability of sand bodies and poor connectivity of reservoirs.It is difficult to evaluate accurately.Therefore,it is urgent to explore a set of evaluation techniques for logging well sandstone oil in the Fuyu reservoir of Sanzhao sag,and to establish a method for evaluating the logging of tight sandstone reservoirs in Fuyu reservoir of Sanzhao sag,and to provide reliable for finding the tight sandstone "dessert" zone for exploration in this area technical support.The determination of the "dessert" area of the tight sandstone reservoir is to determine the distribution of the source rock and the main reservoir in the plane,and to determine the concentrated development of the relatively high quality reservoir in the longitudinal direction.Compared with the conventional oil and gas reservoirs,the focus of the evaluation of the tight oil reservoir is not to implement the traps,but to find the intersection of the two-"dessert"areas by carrying out the geological evaluation of the high quality hydrocarbon source rocks and the reservoir concentrated development section,so as to provide a strong support for the late fracturing selection.Therefore,the focus of the evaluation of the tight sandstone reservoir includes three aspects: the quality evaluation of the source rock,the evaluation of the reservoir quality and the evaluation of the engineering quality.Based on the characteristics of logging technology,this paper studies and analyzes the characteristics,lithology,physical properties,oil-bearing properties and brittleness characteristics of hydrocarbon source rocks in Fuyu reservoir of Sanzhao sag,and establishes a dense oil reservoir logging.Five"evaluation method.In this paper,the characteristics of hydrocarbon source rock and the evaluation of oil content in oil-based mud drilling are solved.The method and oil content of TOC areestablished under the new mud type.The lithology of the main lithology of the tight sandstone in the Fuyu oil layer of Sanzhao sag was measured by using the new logging technology and X-ray diffraction technique.The lithology identification standard,the brittleness index calculation standard and the lithological index were established.The results show that the horizontal well trajectory interpretation method and the semi-quantitative evaluation standard of the horizontal well production capacity are established by using the horizontal well geological guidance technology.These methods have been applied and verified in Fuyu reservoir of Sanzhao sag,and have achieved good results in practical application.