In order to solve the problem that the pore structure and the microscopic occurrence characteristics of fluid change with stress in real time during the depletion development of tight gas reservoirs, the pore structure, water production and irreducible water distribution characteristics of tight reservoirs in the eighth member of Permian Shihezi Formation, Shenmu Gas Field, Ordos Basin under different stress conditions were quantitatively characterized, and the influence of stress on gas-water relative permeability was analyzed by using nuclear magnetic resonance (NMR), high-pressure mercury injection (HPMI) and displacement experiments. The results show that when effective stress increases from 7 MPa to 17 MPa, reservoir porosity decreases from 8.39% to 7.65%, and the maximum pore radius decreases from 38.3 μm to 35.2 μm among which, the number of pore throats in the range of 0.3-18.9 μm decreases the most. The number of pores involved in seepage decreases due to the decrease of pore throat size, the bound water saturation increases from 51.3% to 59.7%, and the distribution range of the size of bound water increases from 0.012-17.4 μm to 0.012-20.1 μm. The changes of pore structure and bound water distribution characteristics further reduce the relative permeability of both gas and water phases, the relative permeability of gas phase decreases from 0.481 to 0.283, and that of isotonic point decreases from 0.157 to 0.09.

层序地层学是地层沉积解释的重要基础理论与方法.然而,在满足被动大陆边缘条件下,海相层序地层学在层序界面划分和解释方法上仍存在许多不同.尤其是对于不满足被动大陆边缘条件的陆相沉积,其陆相层序地层学理论在应用中更面临诸多挑战.此外,在局域三维地震资料解释时,如何正确理解和应用层序地层学理论与方法也存在很多值得探讨的问题.针对松辽盆地薄储层勘探、开发中的技术需求,特别是在地震资料的分辨率难以完全满足薄储层解释的情况下,充分利用三维地震数据和测井资料,聚焦薄储层研究目标构建储层相对等时面,并使之满足拟被动大陆边缘条件,从而建立其与层序界面的联系,为应用局域三维地震资料开展层序地层学解释创造必要条件.通过对沿顶部层序界面拉平的地震剖面和测井资料的解释,可获得局域古地貌、局域沉积中心、局域沉积物源等沉积信息.在此基础上,当两个相邻层序界面间的地层沉积环境满足拟被动大陆边缘条件时,应用空间相对分辨率理念,依据地震属性切片开展储层沉积演化解释,进而获得薄储层的沉积相和空间展布规律的认识.

Lower Paleozoic carbonatite Ma51+2gas reservoirs in Yulin Gasfield,located on the east side of Jingbian ancient submarine platform of Ordos Basin,which is the expanded part of the developed Ma51+2 gas reservoir in the Jingbian Gasfield.Under the effect of drilling and the production characteristics,the Lower Paleozoic reservoir shows good development potential.Because the heterogeneity of reservoir is strong,the data of early gas field is not rich enough,and the density of well pattern is relatively low.There is a certain degree of error in the proven reserves.At the same time,it is in the process of rolling development of the gas field.Because avoided the thin reservoir and the poor physical property,the actual use of geological reserves and the early submission of the proven geological reserves are different.This will influence the accuracy of the calculation results of the development index of gas recovery rate,recovery degree,recovery ratio and so on.In view of the problem,many methods are adopted to separate gas reservoirs into relatively independent flow units.By carrying out the gas-bearing area and reserves of each flow unit,it is more accurate and reliable to verify the actual geological reserves obtained by excluding the undeveloped area in the gas-bearing area.The dynamic reserves of gas wells are calculated by using many methods.The dynamic reserves of gas fields are calculated by area weighted method and flow unit method.On the basis of this,the dynamic ratio of reserves is calculated,which lays a foundation for accurate calculation of gas recovery.According to the economic evaluation and gas reservoir engineering research,the waste gas and waste formation pressure will be confirmed in the gas field.Combined with the dynamic reservesand its ratio for the geological reserves, the recovery of the different geological reserves will be calculated finally.Through comparison and analysis,the geological reserves ratio are proved to be of greaterror.Itismorescientificandpractical to verify the geological reserves ratio to be practical,to have lateral comparability.The dynamic geological reserve ratio excluded the ineffective reserves of non-seepage,which is more accurate and reliable.

位于东印尼Seram岛上的Oseil油田是侏罗系Manusela碳酸盐岩裂缝型油藏,油气的分布严格受控于裂缝的展布和发育程度。本文运用频谱分解技术对该区的断裂系统分布和微裂缝的展布规律进行了研究。通过对Manusela层反射特征的分析和裂缝型储层正演模型模拟,总结出碳酸盐岩裂缝型储层的地震响应特征。选择最能反映目标层断层特征的40ms时窗制作了频率调谐体和时频四维体。频率调谐体分析表明,研究区中部和南部发育两组交叉的断裂体系,北部发育一组断裂体系,断层的附近裂缝较为发育,裂缝的展布严格受控于断层的发育。时频四维体从空间上雕刻出了断层和裂缝的分布,裂缝具有表层较发育、深层发育较差的特征,但两者的深层裂缝分布规律比较一致。频谱分解技术预测的结果与钻探结果较为吻合,表明此法有广阔的应用前景。