| Through the reservoir evaluation research over the last two years thinks that the block belongs to the river channel sand body deposition, part of the horizon is lacustrine deposition and oil and gas water distribution is relatively complex, oil and gas water distribution need to be further implemented. The study block development effect is poorer after put into production, at present, the south east part of Wells has been basically in a state of no production in Chao 202-2 blocks. Need to carry out the related research in the area to guide the development of well selection and the preparation of development plan, at the same time to carry out the reserves potential.The project is the comprehensive utilization of seismic, geological and logging data, based on the seismic sedimentology study, select 3D seismic work area to carry out seismic attribute analysis and well combined with the seismic inversion for the study of river facie sand body distribution, increase the degree of the interwell sand body prediction; At the same time combined with drilling data about 240 wells for oil-water identification standards of research, conclusion the distribution regularity of reservoir and water layer, analysis the current reservoir type and select the advantage of block.In the study area has made the following aspects:1. According to well logging curve combination style, the fuyu reservoir is divided into 13 short half cycleRepeated contrast backbone of well logging curve combination style Fuyu reservoir sedimentary period in the study area is determined after the comprehensive analysis with a single well in the study area, on the basis of sequence stratigraphy, the basin has experienced the prograde- fast prograde- stable retrogradation- rapid retrogradation filling process, which were divided into 3 oil layers, Fu â… is subdivided into three sandstone groups and seven little layers, Fu â…¡is subdivided into two sandstone groups and five little layers, Fu â…¢ is subdivided into three sandstone groups and five little layers.2. The determination of types of sedimentary microfacies and the establishment of the logging modelThrough the analysis of the provenance, using the date of core, well logging and seismic o identify the study area in fuyu reservoir sedimentary microfacies types and characteristics and to establish the corresponding identification marks. Through the analysis of seismic attributes, the sand body distribution in the studied area is forecasted; Through the method of well-log and seismic data, Has carried prediction on the sedimentary microfacies in the study area.3. The attribute analysis researchAmplitude class attribute can better reflect the planar distribution of the sandstone and frequency class attribute take second place, phase can reflect macroscopic sandbodies boundary but the correlation between attributes and sandstone is low and highest do not exceed 0.5 after property analysis.4. The inversion prediction researchInversion results of synthetic seismogram and original seismic records has the small difference, the inversion data volume and borehole-side trace curves is rather good, using the wells drilled in sand body to test is in good agreement. To compare the log interpretation of reservoir sand body with borehole-side trace, well drilling in sand body thickness is greater when the thickness over 3m. Through the above analysis, considers that the wave impedance is obvious in inversion data and geological phenomenon more clearly which can be used for the next step of reservoir analysis and comprehensive research work. |
