Abstract
Prospectors usually recognize the event with strong amplitude in seismic sections as bright spots. However, such a simple and rough method can’t distinguish whether these bright spots are related to favorable gas layer or water layer directly. In this paper, for the high correlation between reservoir gascontent and amplitude anomaly in research area, based on rock physical analysis of the wells drilled, using forward modeling technique respectively simulates and analyzes the seismic amplitude of gas layer and water layer. Then, combining the simulation result with corresponding statistics amplitude obtains the numerical relationship between each layer amplitude. At last, using the display technique directly recognizes the bright spots of gas layer in seismic profile and gets rid of those false bright spots caused by water layer, which improved the robustness in the bright spots interpretation and provided reliable basis for reducing exploration risks. Moreover, applying the method to the target zone, we obtain huge success.
Highlights
Bright Spot Technology [1] [2] is a method used to detect oil and gas accumulated in traps based on real amplitude, which became an important or indispensable means in oil-gas exploration with good results in practical application [3] [4]
At last, using the display technique directly recognizes the bright spots of gas layer in seismic profile and gets rid of those false bright spots caused by water layer, which improved the robustness in the bright spots interpretation and provided reliable basis for reducing exploration risks
In order to realize the purpose of explaining the bright spot directly into gas layer or water layer in seismic profile, first of all, based on the petrophysical analysis for the wells drilled and according to the relationship between the impedance of the reservoir and the surrounding rock, determine the relative relationship of amplitude between the reservoir and the surrounding rock by using simulation method, combine the relationship with the statistical results of the actual seismic amplitude value corresponding to the drilled reservoir, distinguish bright spots shown by gas layer and water layer with the quantitative display means, eliminate the false bright spots caused by water layer and highlight the true bright spots caused by gas layer [14] [15] [16]
Summary
Bright Spot Technology [1] [2] is a method used to detect oil and gas accumulated in traps based on real amplitude, which became an important or indispensable means in oil-gas exploration with good results in practical application [3] [4]. This technology is based on the change of seismic wave amplitude versus hydrocarbon in reservoir. Whether gas layer and water layer can be identified directly on the seismic profile by analyzing the amplitude of bright spot, so as to reduce the multi-solution of bright spot identification [10] [11] [12] [13]? Based on rock physics analysis and using the current amplitude fidelity of seismic data, the quantitative interpretation research of bright spot has been carried out from the perspective of amplitude quantification for gas layer and water layer, which directed the identification of hydrocarbon reservoir in study area and laid the foundation for the success of subsequent wells
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