地震正演在深水沉积地层研究中的应用OA北大核心CSTPCD

To improve the seismic interpretation accuracy and seismic data information extraction capacity of deep-water sedimentary formation,seismic forward modeling was conducted on the slope deposits with canyons.The seis-mic reflection characteristics of cleuch,channels and canyons dominated by turbidity flow and block transposition are analyzed.The fine forward modeling of the natural levee complex of channels is carried out.The comprehensive analysis suggests that the width-depth ratio of the cleuch dominated by block transport is low and symmetrically filled,and the interior is mainly chaotic weak amplitude reflections.While the canyons dominated by turbidity flow has a large width and depth,the interior of which is an undulating high amplitude reflections;the smaller the angle between the top and bottom interfaces of the formation,the greater the error between the true pinch-out point and the seismic reflection pinch-out point;the decrease in thickness of the natural levee complex of channels results in a lower seismic reflection frequency and enhanced amplitude;the amplitude of the channel when it is saturated with water is stronger than that when it is saturated with gas.Hence the seismic response characteristics of multi-type deep-water sedimentary bodies with different morphological attributes are further clarified,which can effectively improve the accuracy of comprehensive interpretation of seismic data in deep-water sedimentary formations.