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卫星—升平地区登娄库组地震反演方法研究
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摘要
松辽盆地北部卫星-升平地区经历多年勘探开发,针对中浅层做了深入的研究,但由于该区白垩系下统登娄库组埋深大,井资料少,目前对该区研究与认识程度较低。
     本文对道积分反演、递推反演、基于模型反演这三种反演方法的原理、特点及反演方法的适用条件和限制进行了分析和研究,重点对约束稀疏脉冲反演和地质统计随机模拟反演方法原理进行了分析和比较。综合地震、测井、地质资料,应用地震反演技术对卫星-升平地区储层进行了分析和研究,揭示了研究区地下登娄库组储集性能的空间展布特征,在此基础上进行有利区预测。
     采用Jason反演软件中的InverTrace~(Plus)约束稀疏脉冲反演和StatMod地质统计随机模拟反演模块,对研究区进行地震反演及砂体厚度、孔隙度和渗透率分布特征的预测。通过实际应用对比,约束稀疏脉冲反演结果分辨率较低,与地震数据的相关性好,反演结果稳定,但不能达到分辨薄层的要求。地质统计随机模拟反演将地震反演方法与随机模拟理论进行充分的结合,利用井数据和稀疏脉冲反演方法得的阻抗体协同进行随机模拟,综合了测井数据的垂向分辨率和地震数据的横向分辨率的优势,但其结果具有多解性。通过对该区地层岩性和储层敏感测井参数分析,发现深侧向电阻率能很好地区分砂、泥岩。因此,选用深侧向电阻率来进行反演,来精细刻画研究区登娄库组的砂体厚度空间展布,并且利用波阻抗协模拟反演对研究区的孔隙度和渗透率进行了进一步的预测,从而确定有利区带。
     根据研究区地质特征、地震反演预测成果,结合前人研究资料,对研究区进行了综合储层评价,圈定了储层发育的有利区块。主要分布在汪家屯构造和升平鼻状构造,以河道砂体为有利储层,为研究区登娄库砂岩气藏勘探的Ⅰ类有利区带;其他区域为Ⅱ类区。
Northern Songliao Basin Weixing-Shengping area has experienced many years ofexploration and development, and many predecessorsd have been done at different levels formedium-shallow layers, but the depth of burial of Low Cretaceous Denglouku Formation islarge, and the number of wells is little,at present,the study and knowledge of the area is notenough.
     Based on Trace integral inversion, recursive inversion, model-based inversion theory ofthe three inversion methods, the inversion method of characteristics and inversion methodapplicable conditions and limitations of the analysis and research, and focused on theconstrained sparse spike inversion and geostatistical stochastic simulation inversion wereanalyzed and compared. the integrated seismic data, well logging data and geological data, inthis paper,seismic inversion technique for Weixing-Shengping area was analyzed and studiedto reveal the spatial distribution characteristics of the study area Denglouku Formationreservoir performance. On this basis, pointing out the favorable regions.
     On the basis of theory, I use InverTrace~(Plus)-constrained sparse spike inversion andStatMod-geostatistical stochastic simulation inversion module from Jason software. To studythe area, seismic inversion and sand thickness, porosity and permeability distribution of thecharacteristics of prediction.Through comparison of the practical applications, we can findthat the constrained sparse spike inversion has low resolution, high correlation with seismicdata and stableinversion result, but cannot meet the requirement of flaggy resolution.geostatistical stochastic simulation inversion combine thoroughly the seismic inversionmethod with Stochastic simulation Theory.Well data and the sparse spike inversion of theimpedance cooperate with stochastic simulation, which integrate the lateral resolution ofseismic data and the vertical resolution of logging data. But the result hasmultiplicity.According to the lithology and reservoir sensitive logging parameters analysis, itis found that the sand and shale can be well distinguished by P-impedance, but but LLD candistinct it well,Therefore,we selected LLD to inversion to finely described the spatialdistribution of the sand thickness in this area. and we used P-impedance co-simulationporosity and permeability, in order to determine the favorable regions.
     To find out the beneficial area block for the reservoir development according to thegeologic feature, the outcome of seismic inversion predict, and the materials researched byformer people.Mainly in Wangjiatun construct and the Shengping nose-like structure,channel sand for Denglouku sand gas reservoir exploration class Ⅰ favorable zone; other regions forClass Ⅱ zone.
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