Processing And Interpretation Integrative Study Of DongHe Sandstone Stratigraphic Trap In HD4 Oilfield, Tarim Basin

At present, subtle reservoirs prospecting is one of the most important prospecting area at home and abroad. With a large number of years prospecting, a series of techniques had been founded to aim at the prospecting of subtle reservoirs. Based on the geologic features of DongHe Sandstone(DHS) subtle reservoirs in HD4 oilfield, the dissertation brings forward an integrative data processing and interpretation method which is aiming at the subtle reservoirs. The geologic problems are the connection between data processing and interpretation, and the dissertation present a research method of using relative amplitude preserved high resolution data processing techniques and high-fidelity reservoir and structure interpretation techniques. The data processing techniques include QC(Quality Control) methods for amplitude, wavelet and high-frequency noise in 3D data processing, time frequency domain near surface and earth absorption and attenuation compensation method and anisotropy velocity analyzing method. The QC methods not only can be used to monitor the 3D data for processors and interpreters during the data processing, but also can be used to economically know the data quality at each shotpoint and receiver. The method of time frequency domain spherical divergency and absorption compensation can be used to compensate the excitation energy in time and frequency domain, so we can reach the aims of amplitude preservation and enhancing seismic resolution. The analyzing method of anisotropy velocity can be used to solve the problem of conventional near and far offset NMO correction, so the stack profile is reasonably good. This is the basis of low relief structure mapping. Seismic data interpretation techniques include the thin reservoir which is less than 1/4 wavelength calibrating technique, predicting oil-bearing range through seismic attributes, elastic impedance inversion and variable velocity structure mapping. Using these techniques, we carried out the calibration of target formation again, and predicted the pinch out belt of DHS, the petrophysical properties of DHS and oil-bearing features in it. Based on the analyzing of anisotropy velocity, the principle of choosing the control well was provided through a great number of...