CAJ | 학술논문

地层密度直接与孔隙度、孔隙流体类型、饱和度和骨架矿物成分有关.本文通过理论分析和计算,讨论了油气藏储层物性参数变化引起的密度变化及密度变化对地震波速度、阻抗和振幅的影响,提出了基于完全纵波方程的全波形地震密度反演和孔隙度估计方法,克服了常规地震密度反演对地震数据更多处理引起的信号畸变,提高了地震密度反演和地层孔隙度估计的精度.该方法采用波场导数的时间积分和多炮求和,对地震数据中的噪声具有比较强的压制作用.理论模型研究表明该方法是可行的.通过对我国西部某气田实际数据处理、分析和反演,获得了地层密度和孔隙度,结果与测井基本吻合,证明了预测结果的准确性和方法的有效性,从而为后续的有效储层预测和储量计算提供了可靠的数据.
지층밀도직접여공극도、공극류체류형、포화도화골가광물성분유관.본문통과이론분석화계산,토론료유기장저층물성삼수변화인기적밀도변화급밀도변화대지진파속도、조항화진폭적영향,제출료기우완전종파방정적전파형지진밀도반연화공극도고계방법,극복료상규지진밀도반연대지진수거경다처리인기적신호기변,제고료지진밀도반연화지층공극도고계적정도.해방법채용파장도수적시간적분화다포구화,대지진수거중적조성구유비교강적압제작용.이론모형연구표명해방법시가행적.통과대아국서부모기전실제수거처리、분석화반연,획득료지층밀도화공극도,결과여측정기본문합,증명료예측결과적준학성화방법적유효성,종이위후속적유효저층예측화저량계산제공료가고적수거.
Formation mass density is directly related to porosity, fluid type, fluid saturation, ancl matrix mineral composition. The change of the reservoir parameters can cause the change of density and then the seismic velocity, impedance and amplitude. We discussed the characteristics of the changes by theoretical calculation and presented a method for estimating density and porosity based on full acoustic waveform inversion. Because of avoiding the signal distortion caused by more processing, the method can improve the inversion accuracy of density and porosity. It also can eliminate noise by integrating the derivative of wave field along time and summing multi-shot data. The method has been tested successfully by a synthetic example and gas-field data from western China. The density and porosity provided by the method agree with the logging result. It also supplies reliable data for prediction of effective reservoir and calculation of reserves.