塔中62、82井区缝洞型碳酸盐岩储层井间连通性研究

由于缝洞型碳酸盐岩储集体的强烈非均质性,给开发井的部署及调整带来极大困难,因此,划分缝洞单元、弄清井间连通性成为提高开发井的命中率及合理调整的有效手段。针对缝洞型碳酸盐岩储层的复杂性,提出综合利用干扰试井法、流体性质分析法和油藏压力系统法等进行井间连通性研究,从而划分流动单元,指出了划分流动单元的研究意义。     

大理石磨削条件对磨具磨削性能的影响

本文研究了定压端面磨削大理石时,磨削加工条件对磨削生产率和加工表面质量的影响;分析了磨具磨损特征;提出了合理选择加工条件的原则。实验结果与理论分析相一致,可供生产厂家参考。     

球压头切削大理石的力学分析

本文在球压头切削大理石模型的基础上,运用塑性力学导出切削力计算公式,并以实验证明其可靠性.     

渤海F油田明化镇组下段Ⅳ油组沉积微相研究

结合岩心、薄片、分析测试和测井曲线等资料,对F油田明化镇组下段Ⅳ油组沉积微相进行综合分析。研究表明:Ⅳ油组储层砂岩主要为长石砂岩和岩屑长石砂岩,分选中等,磨圆度以次棱—次圆状为主。岩心中可见典型河流相的沉积构造,测井曲线特征包括箱形、钟形、漏斗形、指形、线形。Ⅳ油组发育曲流河沉积相,包括河道和边滩、天然堤、决口扇、漫滩沉积、废弃河道和泛滥沼泽沉积微相。Ⅳ_4砂组以泛滥平原沉积为主,从Ⅳ_3砂组开始,物源供应增强,平面上发育3至4条曲流河道,Ⅳ_1砂组沉积时期河道规模开始变小。     

Formation mechanism of reservoir oolitic dolomite in Lower Triassic Feixianguan formation,northeastern Sichuan Basin,southwest China

A series of marine natural gas fields were recently discovered in oolitic dolomites of the Lower Triassic Feixianguan formation, northeastern Sichuan Basin, southwest China. The mechanism forming these reservoir dolomites is debatable, limiting the ability to characterize these reservoir successfully. Based on the investigation of the representative Dukouhe, Luojiazhai, and Puguang areas, this issue was addressed by examining the distribution, petrology, and geochemistry of the dolomites, the most comprehensive study to date was provided. Dolomitization occurred at a very early stage of diagenesis, as shown by the petrological features of the rock fabric. Vadose silt, which is composed primarily of dolomitic clasts, is found in the primary and secondary pores of the oolitic dolomite. This indicates that the overlying strata were subjected to dolomitization when the Feixianguan formation was located in the vadose zone. Therefore, it may be inferred that the dolomitization which occurred before the formation was exposed to meteoric conditions. The spatial distribution and geochemical characteristics of the dolomite indicate that dolomitization occurred as a result of seepage reflux. The degree of dolomitization decreases with increasing distance from the evaporative lagoon. Furthermore, the type and porosity of the dolomite vary in different zones of the upward-shoaling sequence, with the porosity gradually decreasing from the highest layer to the lowest layer. This reflects a close relationship between dolomitization and seawater evaporation during the formation of the dolomite. Geochemical analysis provided further evidence for the relationship between the dolomitization fluid and the coeval seawater. The 87Sr/86Sr and 813C isotopes, as well as the abundances of trace elements, Fe and Mn, indicate that seawater concentrated by evaporation acted as the dolomitization fluid. These results also show that dolomitization most likely occurred in a semi-closed diagenetic environment. Therefore, the main mechanism of ool     

礁滩型储层层间非均质性定量表征

受成岩作用与构造作用等因素的影响,礁滩型储层非均质性较强,而定量表征其非均质性对储层预测及油气田开发均具有重要的指导意义。以普光气田礁滩型储层为例,通过优选综合指数法及渗透率参差系数法对该储层层间非均质性进行了定量表征。结果表明：2种表征方法的结果一致,且与地质认识相符。避免了单参数表征带来的不确定性,同时也避免了表征参数无界的影响。以上方法实现了对储层层间非均质性的定量表征,真实地反映了普光气田礁滩型储层层间非均质性较强的特点,并可为国内外同类研究提供参考。     

流动带指数在中低渗灰岩渗透率解释上的应用--以中东F油田白垩系Mishrif组为例

针对无法用现有资料区分碳酸盐岩不同沉积成岩相的情况,本文采用了流动带指数(FZI)理论划分岩石类型以解释中低渗灰岩储层的测井渗透率。先从岩心标准柱样塞常规物性分析资料入手,以岩心样本为分析对象用FZI指数划分岩石类型,并拟合各类型的渗透率计算公式。再以孔隙度解释曲线等测井资料为基础,将关系式推广到非取心段,从而完成整个目的层段的渗透率测井解释。结果表明,在中东F油田白垩系Mishrif组灰岩中,该方法得到的渗透率与岩心实测渗透率之间的差异较小,在非取心段渗透率曲线的连续性好,取得了良好的解释效果。该方法能够有效解决中低渗灰岩储层的渗透率解释,对相似油田具有借鉴意义。     

普光气田须家河组绿泥石成因及其与储层关系

利用大量镜下薄片鉴定、包裹体、扫描电镜以及阴极发光等资料,对普光气田须家河组储层绿泥石形成时间、成因及其与储层的关系进行了研究。结果表明,研究区绿泥石形成于成岩作用早期;与三角洲沉积环境有关,须二段-须四段为三角洲前缘沉积环境,河口坝和远砂坝中的含铁沉积物为绿泥石的形成提供了丰富的铁来源;绿泥石对研究区致密砂岩储层具有积极的作用,可以抑制次生石英加大,同时提高岩石的机械强度和抗压实能力,有效地保存了砂岩的原生孔隙,有助于指导研究区的下一步油气勘探。     

对菱苦土磨具的实验研究

本文较全面、详细地研究了菱苦土结合剂各组成要素对菱苦土磨具硬度的影响,得到了硬度与MgO/MgCl_2重量比之间的回归公式,分析了磨其硬度及磨削工艺参数对磨具磨削性能的影响。本文的结论对大理石磨削加工中菱苦土磨具的试制和改进具有一定的参考价值,所选出的最佳磨具配方可直接用于生产。     

塔中地区ZG5-7井区横波速度的预测

纵、横波速度是储层岩性、物性和流体识别的重要参数,而实际生产中往往缺乏横波速度资料,因此,开展横波速度预测已成为岩石物理研究的重要内容。目前横波预测中普遍使用的是Greenberg-Castagna经验公式,但其在塔里木盆地塔中地区ZG5-7井区应用效果不佳。针对上述问题,充分利用已钻井的纵波速度、地层密度、泥质含量、孔隙度、含水饱和度等常规测井资料以及岩石骨架和流体的各种弹性参数,构建了流体置换的Xu-White模型,用来求取横波速度。该区６口井的横波曲线拟合的实验结果表明：Xu-White模型预测的横波速度与实测横波速度高低趋势一致,其相关系数最高达到0.970 9,完全能满足横波弹性反演和油气预测的需要。结论认为,Xu-White模型不仅适用于碎屑岩储层的横波速度预测,同样在碳酸盐岩的横波速度预测中也能取得良好的应用效果。