| Bohai oil field is the largest offshore oil field in China and the second largest crude oil production base in China.The area of Bohai has a area of 73 thousand square kilometers,of which the area of exploration mining area is about 43 thousand square kilometers,and the total resources are about 12 billion cubes.As of the end of 2010,three of oil reserves in the Bohai oilfield found a total of nearly 5 billion,and found Penglail9-3,Suizhong 36-1,Qinhuangdao 32-6,Bozhong 25-1,Jinxian 1-1,Jinzhou 25-1 and several hundred million tons oilfield,the geological reservoir has broken structure and fracture characteristics such as education,complex reservoir.The reservoir in fluvial,Delta,ancient Qianshan,oil is thick,heavy oil reserves accounted for more than 65%.The research area is located in the southern part of the Bohai area of the Bohai Bay Basin,with a total area of about more than 4600 square kilometers.It is composed of Bonan low uplift,Huanghekou sag,Laibei low uplift and Laizhou Bay sag from north to south.The main development of the Cenozoic is the Paleogene Kongdian formation,the Shahejie Group,the Dongying formation,the Neogene Guantao formation,the Minghuazhen group and the Quaternary plain group.There are hundreds of wells in the oil and gas reservoirs in Bohai exploration area.There are hundreds more wells in the single research area,and because of the different reservoirs,the formation structure is complex and the formation parameters are different.For example,the different porosity will cause the different well test curves and the productivity equation,so there are many difficulties in obtaining key and useful well test data and fine interpretation of well test data after well test data.In order to meet the needs of further development of the oil and gas field in Bonan exploration area,the complexity of the oil and gas wells in Bonan exploration area must be overcome and the well test interpretation method suitable for the oil and gas field in Bonan exploration area is studied.Therefore,the study of the well test interpretation model and the productivity calculation method for the Cenozoic sandstone reservoir in Bonan exploration area has important guiding significance for the development of block oil and gas fields.Based on the dynamic data of the reservoir geology,drilling and testing of the Cenozoic sandstone reservoir in the Bonan exploration area,this paper makes a fine interpretation of the test well data of the Cenozoic sandstone reservoir in the Bonan exploration area,determines the physical model of the oil seepage in the study area,and establishes a typical block test interpretation model and each small well test interpretation model.On the basis of the investigation,various methods are used to determine the main control factors of the production capacity of the Cenozoic sandstone reservoir in the Bonan exploration area,and the productivity range of the study area is determined,and the productivity equation is established by using the related parameters to provide the reference basis for the productivity calculation of the Cenozoic sandstone reservoir in Bonan exploration area.On the basis of the above research,the following points are made:First,according to the results of statistical analysis,the seepage physical model and corresponding mathematical model of homogeneous model,composite model and dual porosity medium model are established.Second,the test data of Dongying group is mainly interpreted as homogeneous model;Guantao group is mainly homogeneous model and some wells need to add fault boundary;Minghuazhen group is mainly homogeneous model and compound model,some wells need to add fault boundary,and Shahejie Group is dominated by homogeneous model.Third,based on the interpreted formation pressure and production data,the productivity of oil and gas well is evaluated.According to the stratigraphic characteristics of Kenli area,binomial formula suitable for this block is put forward and the productivity of single well is calculated. |
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