鄂尔多斯盆地苏西地区盒8段及山1段为辫状河沉积，其含气储层与围岩纵波阻抗相近，利用常规叠后资料不能有效识别含气储层；同时，山1段砂体为中—弱振幅不连续地震反射，其同相轴无法在全区进行合理追踪，难以预测砂体的平面展布特点。针对以上问题，根据辫状河地质沉积特点，建立辫状河地震响应模式。利用含气储层和围岩泊松比差异明显的特点，尝试应用叠前AVO资料来识别含气储层。借鉴地震沉积学理论和方法，提出将AVO属性体岩性化，以便于后续的岩性解释。采用切片方法合理获取山1段砂体地震反射等时面。研究结果表明：正演和生产实践均验证了AVO属性体岩性化这一方法的合理性和实用性。应用该方法对研究区盒8段和山1段含气储层进行了有效的识别，具有等时意义的地震切片属性准确地反映了含气储层空间发育及平面展布特点。

The He 8 and Shan 1 members belonging to braided-river deposition are pay zones of Sulige western region, Ordos basin. The ranges of P-wave impedance of gas-bearing reservoir and surrounding rocks of these two members are overlapping. The gas reservoir could not be feasibly recognized by conventional post-stack seismic data. Also,due to the discontinuous mid-weak amplitude of seismic reflection,the seismic event of Shan1 member can′t be picked in the whole work area,leading to difficulty in obtaining the plane view of its sandstone distribution. Attempting to solve the problems above, we established the seismic response characterization of braided-river according to its sedimentary model. As the difference of Poisson ratio of gas-bearing reservoir and surrounding rocks are distinct,the AVO seismic data were utilized to identify gas-bearing reservoir. The conception of lithological converting has been proposed with reference to the theory of seismic-sedimentology. The AVO att

缝洞型碳酸盐岩储层存在强烈的空间非均质性,储层表征与评价难度极大。塔北隆起西部W区块奥陶系中统顶部发育稳定的台地相碳酸盐岩缝洞型储层。应用古地理坐标转换构造建模技术、测井储层分析方法,并结合缝洞型储层地震属性进行储层相研究,以储层相分析成果为基础建立双孔隙度模型,对缝洞型储层进行定量表征,最后结合AVO流体预测,进行综合评价。研究表明:该区碳酸盐岩储层类型主要为裂缝型、裂缝孔洞型,裂缝既是储集空间又是孔洞形成的诱导因素;本征值裂缝属性和地震波形分类属性对裂缝与孔洞响应较为敏感;储层含油饱和度提高之后,AVO现象更趋明显,叠前AVO反演的流体预测技术能对缝洞型碳酸盐岩储层流体进行合理预测、评价。

Fracture-cavity type carbonatite reservoir has strong dimensional anisotropism, and hence reservoir characterization and eval-uation are very difficult. The plateau facies carbonatite fracture-cavity reservoir is stably developed in Middle Ordovician strata in west-ern W block of northern Tarim uplift. Utilizing paleo-geographic coordinate transform, logging reservoir analysis and sensibility attribu-tor analysis of the fracture-cavity type carbonatite reservoir, the authors studied the reservoir facies. Based on reservoir facies research and utilizing stochastic method, the authors built the dual porosity model for fracture-cavity reservoir, and characterized the carbonatite reservoir. Finally, in combination with AVO inversion and reservoir characterization, the carbonatite reservoir was evaluated. It is proved that the reservoir pattern in the study area is mainly of the fracture and cavity type, with fractures acting both as hydrocarbon ac-cumulation space and as the factor for the

对于非常规的储层,例如页岩气,它的储层区是脆性的。在描述不同岩石物理的参数中,杨氏模量E是衡量岩石的脆性的。计算杨氏模量E时,需要有效密度,而计算密度时需要的大偏移距地震资料通常是很难得到的。针对这种情况提出了一种新岩石物理参数E,即杨氏模量和密度的乘积,通过与属性的对比体现其在AVO叠前反演中的优势。

The discrimination of fluid content and lithology in a reservoir is animportant characterization that has a bearing on reservoir development and itsmanagement. Amongst the different petrophysical parameters, Young''s modulus (E) is a measure of their brittleness. But the densityis difficult to derive from seismic data, unless long offset information isavailable. Due to this, we propose a new attribute, E, which is the product of Young''s modulus and density, having some advantages in the AVO pre stack inversion by comparison with Mu Rhoattributes.