The Research Of The Microstructure Of Donghe Sandstone Reservoir In Hudson Oilfield Identification And Characterization

Based on the methods and techniques of the related disciplines such as sequence stratigraphy,reservoir geology and three-dimensional seismic data interpretation,this paper is based on the data of Donghe sandstone in Hudson Oilfield,Tarim Basin,which integrates earthquake,well logging,geology and dynamic data.The stratigraphic division and comparison of the Donghe sandstone are carried out,and the microstructure identification and characterization are carried out.It is clear that the Donghe sandstone section of the target layer is an incomplete sequence,which is further divided into two subsequence sets and five subsequences.The two subsequence sets and five subsequences correspond to two sands group and five single layer in the traditional stratigraphic units.On this basis,16 single sand bodies were identified in 1 single layer,and 21 single sand bodies were identified in 2 single layers.Based on the analysis of the stratigraphic unit level of seismic data,the geologic and seismic response characteristics and thin layer effect of the combination of different interface types are analyzed,and the correction method of the interface position is proposed.Combined with waveforms,variance,inversion and other multi-seismic information,the paper proposed identification micro-structure method.On the basis of the fine interpretation of the earthquake,the reservoir area identified 38 faults;the three-dimensional interpretation of the target layer is carried out by combining the conventional section and the different seismic attributes,and variable speed mapping technology.A total of 76 microstructures were identified and the morphology,type and genesis of microstructures were identified.The formation of microstructures in this area was dominated by tectonic and sedimentation.A total of 44 positive microstructures,8 oblique microstructures and 24 negative microstructures were identified for the top surface of Donghe sandstone section.The relationship between microstructure and hydrocarbon accumulation and the relationship between microstructure and oil well production are clarified by analyzing the microstructure characteristics and production dynamic data of this area.After 2015 and 2016 new drilling validation,the new average drilling error is 2.08 m and the relative error is 0.5 ‰.The error is much smaller than the interpretation standard,and the accuracy of the structure is greatly improved,which can provide the basis for the actual production.