Synthetical Research On Seismic Multi-parameters Reservoir Of Middle-Upper Ordovician In The Estern Region Of The Tarim Basin

The gas and oil exploration in the eastern part of tarim basin has lasted many years.Many predecessors have been done different levels of subregional research about different intent interval in this region.But he depth of burial of the middle and upper Ordovician series stratum is large.The number of geological drilling wells drilled into the intented interval is little.And to the present,the research and knowledge to the the structural distribution, the sedimentary characteristics, the reservoir characteristics is not enough.Based on the predecessor's work achievement,drilling and well logging data,using seismic wavefield multiparameter information, the thesis made reservoir evaluation research on the clastic rock of Middle-Upper Ordovician in this region synthetically on the foundation of the basic theory on sequence stratigraphy, sedimentology, structural geology and petroleum geology.The achievement is abundant and The main work are as follows:1)The thesis processed the poor quality 2D seismic data of the intent interval (199L, altogether 14908km)leading to fine resolution and low noise,using the wavelet reshaping deconvolution, blue color filter and combination denoising.2)By analyzing the log information of 14 wells,the intent intervals are calibrated accurately, the depositional cycle are divided by the seismic time-frequency attributes analysis method (11L, altogether 110 roads).And the sequence stratigraphic framework are established refered the union appears-the log information. The intent interval are divided lastly into one levelâ…¡Level sequence and fourâ…¢Level sequence.3)The seismic structural interpretation are taken(326L, altogether 23630km).And based on the velocity spectrum,the average velocity and interval velocity field are established by the varying velocity restitution method under the correction of the well relationship (252L, altogether 18198 spectrum spots,235960 T-V data).By analyzing the structure and the stratum depth,the thesis considered that the home court overall assumes four week prosperous among concave structure framework, the stratum depth is consistent with the geological environment.4) The way which unify with the convention and the modern law is carried on to the seismic facies analysis (185L,2T).The thesis studied the ancient landform before the four deposition time by the horizon flattening technique (326L,6 long profiles).Unifying the single well sedimentary facies analysis,3 stratigraphic interval sedimentary facies characteristics are analyzed.The thesis considered that various stratigraphic intervals performed fan body, the delta, the marine facies three broad headings, each deposition time had the successing characteristic. 5) Based on the seismic data sound wave impedance method of inversion, by restraining and establishing the mathematical model through the bore-hole relations, the thesis inversed goal reservoir natural parameters such as wave impedance, porosity, penetration coefficient, shale content, sandstone percentage, sandstone thickness (326L), the generalized reservoir characteristics are analyzed.By formulating the reservoir third-level rating standard, the thesis forecasted the various stratigraphic intervals' advantageous area and many places are suggested to be the exploration target area like the Longkou anticline belt.The seismic multiparameter reservoir synthesis forecast law in this area's application has indicated the direction for this area's next step oil-gas exploration.