【作者】 于宝；

【导师】 宋延杰；

【作者基本信息】 大庆石油学院 ， 地球探测与信息技术， 2006， 硕士

【摘要】 本论文是针对同时含有层状泥质和分散泥质的复杂泥质砂岩油气层的导电规律开展研究的。由于层状泥质和分散泥质对泥质砂岩的导电规律影响不同,而目前油田应用比较普遍的W-S、D-W和S-B三种泥质砂岩解释模型只适用于分散泥质砂岩,不适用于混合泥质砂岩,因此需要对混合泥质砂岩的导电规律进行研究,建立混合泥质砂岩通用电阻率模型,以提高复杂泥质砂岩储层的含油饱和度评价精度。本文是从混合泥质砂岩人造岩心的设计和制作、人造岩样电阻率实验测量和混合泥质砂岩电阻率模型建立等三方面开展对课题研究的。基于沉积岩学有关岩石形成理论和油层物理相关知识,采用正交试验设计方法对纯砂岩人造岩心进行了5因素5水平的渗透率试验设计,得到了不同粒度规格石英砂含量和胶结物含量对渗透率影响的主次因素顺序。根据正交试验设计结果,研制出了混合泥质砂岩人造岩心的制作方法,设计并制作了16块不同泥质分布形式和含量的人造岩心样品。测量了不同矿化度和不同含油饱和度的人造岩样电阻率。研究了饱和不同矿化度盐溶液的岩样电阻率与溶液电导率之间的关系和不同含水饱和度的岩样电阻率与含水饱和度之间的关系,实验结果表明,混合泥质砂岩导电可以看作是层状泥质和分散泥质砂岩并联导电的结果。基于层状泥质和分散泥质砂岩并联导电,而分散泥质砂岩导电规律采用双水电阻率模型来描述,建立了混合泥质砂岩双水电阻率模型。通过对模型影响因素的分析,发现泥质分布形式对模型计算的含水饱和度影响很大;随着含水饱和度的增大,胶结指数和系数b也会对模型计算结果产生很大影响。通过对16块人造岩样的计算结果与实验测量结果的比较,发现混合泥质砂岩双水电阻率模型适用于纯砂岩、层状泥质砂岩、分散泥质砂岩和混合泥质砂岩储层解释。本文同时也给出了模型求解含水饱和度方法和参数确定方法,并应用模型对苏1和苏3井进行了解释,结果表明,混合泥质砂岩双水电阻率模型适用于复杂泥质砂岩地层解释,是一个通用的电阻率模型。更多还原

【Abstract】 In the paper ,study on conductance mechanism of complex shaly sand reservoirs with bothlaminated shale and dispersed shale is carried out.Because effects of laminated shale anddispersed shale on conductance mechanism are different,and W-S,D-W,S-B models widely usedin oilfield can only applied in dispersed shaly sands, not in laminated and dispersed shaly sands,it is nessesary to have a study on conductance mechanism of laminated and dispersed shaly sandsto establish a new generalized resistivity model ,so as to improve evaluation accuracy on watersaturation calculated in complex shaly sand reservoirs. The work in the paper included:designand making of synthetic cores for laminated and dispersed shaly sands,experimentalmeasurement on resistivity of synthetic core samples and establishment of resistivity model forlaminated and dispersed shaly sands.Based on the theory about rock forming in sedimentology and some knowledge in reservoirphysics,permeability test of 5 factors and 5 levels for clean sands is carried out using orthogonaltest and the influence order on permeability of sand content of different grain sizes andcementing material content is obtained.Through orthogonal test,a new method of makingsynthetic cores of laminated and dispersed shaly sands is developed,and 16 synthetic coresamples with different distributions and contents are designed and done.Conductivity of synthetic core samples with different salinities and different watersaturations is measured and the relationship between conductivity of core sample saturated withdifferent saline solutions and conductivity of solution as well as the relationship betweenconductivity of core sample with different water saturations and water saturation are studied.Itshows that conductance of laminated and dispersed shaly sand may be treated as parallelconductance between laminated shale and dispersed shaly sand.Based on parallel conductance between laminated shale and dispersed shaly sand,and theassumption under which dispersed shaly sands are described with dual water conductivitymodel,a new dual water conductivity model for laminated and dispersed shaly sands isestablished.Through analyzing some factors which affect the dual water model ,it is found thatthe shale distributions largely affect the water saturation calculated by dual model, and thecementation exponent and coefficient b will also largerly affect the results calculated by dualwater model with the increase in water saturation.Compared the results calculated by doublemodel with the results of experiment measurements for 16 core samples,it shows the dual waterconductivity model for laminated and dispersed shaly sands can be applied to cleansands ,laminated shaly sands , dispersed shaly sands , laminated and dispersed shaly sands.A newway to solve for water saturation and determine parameters in proposed dual water model isgiven.After appling,the proposed double water resistivity model to data for wells #SU1and#SU3,the result shows that dual water resistivity model for laminated and dispersed shaly sandscan be applied in complex shaly sand reserviors and is a generalized resistivity model.更多还原