Prediction And Evaluation Of Reservoir Sand Body In The 3rd Member Of Qingshankou Formation Of Northeast Of Qian'an Area

The northeast of Qian'an area is the key area for the next exploration and development of Jilin oilfield.The regional structure spans three secondary tectonic belts,such as Changling sag in the central depression in the south of the Songliao basin,the uplift belt,the dan-honggang terrace.The plane covers most of Qian'an oil fields.The 3rd Member of Qingshankou Formation has good reservoir forming conditions,however,due to the sand body is thin and the transverse change is fast,the quality reservoir identification is difficult,the further exploration and development of the northeast region is restricted.Therefore,sedimentary facies study is carried out to deepen the geological understanding and predict the reservoir sandstone by using seismic attribute prediction techniques.Based on the core,logging and 3D seismic reservoir and the basis of regional geological data of the 3rd Member of Qingshankou Formation of northeast of Qian'an area,and the distribution of sedimentary facies,channel reservoir sand body types,and a detailed study of relation between capacity clearly describe the importance of channel sand body,and by using seismic attributes fine depict channel sand body prediction technology.Main achievements:(1)The 3rd Member of Qingshankou Formation of the reservoir in the study area has the advantage of the large area of hydrocarbon accumulation,reservoir sand bodies in the provenance direction sandstone extends far,good connectivity,direction of sand body lateral crosscutting source change fast connectivity is poor,the relative fault development,reservoir performance for nasal structure under the background of sandstone updip pinchout lithologic reservoir.(2)According to the provenance analysis,single well sedimentary facies analysis and reservoir sedimentary structure determine the depositional environment in the study area are mainly delta front and front delta subfacies,underwater distributary channel,as high quality reservoir,vertical,? sand ~ ? sand group underwater branch river the most growth,? sand ~ ? sand group underwater branch river development.(3)Studies on the types of sand body types and production capacity of different underwater distributary channels show that the yield of main channel is obviously greater than that of main channel.For the superposition and interstratified underwater distributary channel,the main channel and the main channel are pushed around 250 m and the result is good.The isolated main channel and multilayer system overlay 6m and above with good effect.By using seismic attribute prediction technique,the fine characterization of channel sand body is carried out,and capacity evaluation and well location deployment are carried out in the research area.Specify the direction for the next efficient development.