Secondly , the paper discusses and analyses the characteristic of the seismic wavefield of fractural reservoir and the influence caused by fracture density , property of the filled material , the strike of fracture and so on . and then discusses the problem of the design of the fractured model 其次，在认识了缝洞密度、缝洞中充填物的性质和裂缝走向等因素对缝洞储层地震波场特征的影响之后讨论了缝洞储层中缝洞模型的建立问题。
The frontal structure of longmenshan in the west of sichuan is very complex , showing intense structure deformation in overthrust belt , high structure amplitude , steep stratigraphic dip , developed fault blocks , complex seismic wave field , frequent change of lateral velocity , and poor image of post - stack time migration processing 摘要川西龙门山前缘构造非常复杂，逆掩推覆构造带构造形变强烈，构造幅度大，地层倾角陡，断块发育，地震波场复杂，速度横向变化大，常规叠后时间偏移处理成像效果较差。
Seismic wave field feature of ordovician carbonate karst reservoir ( cave , reef , hole , crack and cranny ) in tahe oil field is the difference magnitude diffraction wave over weak reflection amplitude , so , the diffraction wave exact imaging and fidelity amplitude processing is the basic of carbonate karst reservoir study 摘要塔河油田岩溶储集体（洞穴、礁滩、孔洞、裂缝或裂隙等）的地震波场特徵是弱反射背景之上的强弱不同的绕射波，因此，绕射波准确归位成像和振幅保持是研究岩溶储集体的基础。
The dissertation focuses on seismic wavefield forward modeling and migration for the fractured reservoir . the paper integrates and researches the wavefield extrapolation operator for lateral variation of velocity , analysis of the wavefield characteristic , forward modeling and depth migration of prestack and poststack seismic wavefield , creation of wavelet , design of the model with fracture and cavity , and computation of reflectivity 本文围绕缝洞储层地震波场正演与偏移问题，对横向变速波场延拓算子；叠前与叠后正演模拟；叠前与叠后深度偏移；子波的生成；缝洞模型的设计、反射系数的求取、正演、偏移及其波场特征分析进行了一体化研究。
In term of analyzing and summarizing the existing achievement , propose an advanced and practical wavefield extrapolation operator and arithmetic of forward modeling and migration , which obtain numerical simulation and analysis completely and systemically and exploited new field of fractured reservoir seismic wavefield numerical simulation and applicationin in frequency - wavenumber domain 在总结、分析前人研究成果的基础上，提出了具有前瞻性和实用性的波场延拓算子与正演、偏移算法，较系统全面地进行了数值计算与分析，开辟了频率?波数域缝洞储层地震波场数值模拟与应用的新领域。
Due to the complexity of geological structure and metallogenic conditions in metallic ore districts , only when seismic wave fields are studied from known areas to unknown areas and the seismic time profiles are interpreted by combining physical modeling results with other geophysical anomalies can the study of seismic method for metallic ore exploration yield valuable results 由于金属矿区地质构造和成矿条件比较复杂，金属矿勘查中的地震方法技术研究只有采用从已知区的地震波场研究未知区的地震波场，并结合物理模型实验结果和其他物探异常对获得的地震时间剖面进行解释，才能取得有价值的成果。
( 5 ) when hydrocarbon compound is coved by thick shale , hundreds meters low velocity gas incursion diffuse band is seen clearly above sandstone in huanhua sag . sometimes bulk and range of incursion diffuse band is large than hydrocarbon compound accumulate body . its seismic response must be recorded ( 5 )研究发现，当烃类聚集体被厚层泥岩覆盖，在其上方出现百米以上的低速气浸扩散晕的现象，它对地震波场的附加影响必会被记录下来，使对2500 4500米埋深含油气砂岩的地震检测成为可能。
The paper concentrates on seismic wave - field forward modeling and migration for the fractured reservoir . it researches the wavefield extrapolation operator for lateral variation of velocity , design four theoretical models and seven practical models with fracture and cavity . base on the progenitor , in the frequency - wavenumber domain with the pspi wavefield extrapolation operator and arithmetic of forward modeling and migration that applied lateral variation of velocity which is strong , the paper obtains the result of numerical simulation and the wavefield characteristic by the way of the forward modeling and depth migration of poststack seismic wavefield 本文围绕缝洞储层地震波场正演与偏移问题，研究了适用于横向变速波场延拓算子，建立了四个理论的缝洞模型和七个实际的缝洞模型，在总结、分析前人的研究成果的基础上，利用适合横向速度剧烈变化的相移加插值的波场延拓算子，在频率?波数域对上述的地质模型进行正演、偏移处理，最后得到了缝洞储层地震波场的一些特征。
Further , analyse the characteristic of the seismic wavefield of fractural reservoir and the influence caused by fracture density , property of the filled material and the strike of fracture . fifthly , in term of research of zhangshulun et al . , concisely discuss the arithmetic of the plane wave forward modeling and migration with phase shift method , in prestack common offset gathers and check the arithmetic by numerical simulation 第四，用基于弹性?声学近似的反射系数计算公式和本文提出的付氏变换子波生成法得到缝洞模型的反射系数模型和子波模型并用vrselrf波场延拓算子对其进行地震波场数值模拟；进一步分析了缝洞储层的地震波场特征及缝洞密度、充填物性质和裂缝走向对其波场特征的影响。
In the paper , in order to reveal the characters of seismic migration image affected by velocity model and improve the precision of seismic migration and imaging , we present some analysis to the complex geology conditions , through modeling and migrating the theoretical model , deduce some features of seismic wave field imaging affected by velocity model , and give some advises to improve the imaging and some useful idea 为了揭示速度模型对地震波场偏移成像的影响特征，提高偏移成像的精度，对一些复杂地质模型进行了波动方程正演和偏移，并从理论模型的数值模拟结果中，推导出了速度模型对地震波场偏移成像的一些影响特征，提出了相应的改进建议和一些有益的结论和认识。
