基于孔隙成因的泥页岩总孔隙度恢复方法研究——以渤海湾盆地东营凹陷沙三下亚段为例

发布时间：2018-04-24 10:07

本文选题：页岩油气 + 泥页岩　；参考：《石油实验地质》2017年05期

【摘要】：泥页岩中具有多种类型孔隙,为页岩油气富集提供了重要的储渗空间。恢复泥页岩孔隙演化史,是页岩油气资源评价与区带优选的关键,同时也是开展烃源岩排烃过程研究的重要基础。泥页岩中压实作用减孔、生烃作用增孔以及构造作用造缝是泥页岩孔隙形成的重要机制。基于这3种成孔机制,采用泥岩压实模型计算不同深度泥页岩孔隙度减少量,结合泥页岩的镜质体反射率、有机碳含量以及物性等实测数据,建立了地史演化过程中泥页岩有机质孔与有机碳变化量(ΔC)的数学模型;在拟合不同成因孔隙类型演化趋势模型的基础上,综合构造、岩相、成岩以及应力场特征,建立基于孔隙成因的多类型泥页岩孔隙恢复方法。应用该方法恢复了渤海湾盆地东营凹陷沙三下亚段3种成因类型孔隙的演化趋势,并预测了不同成因类型孔隙的空间展布,进而确定了其泥页岩总孔隙度的分布。预测结果与实钻资料较吻合,可靠性较好。
[Abstract]:There are many types of pores in shale, which provide important reservoir and permeability space for shale oil and gas enrichment. The restoration of shale pore evolution history is the key to the evaluation of shale oil and gas resources and the optimal selection of zones, and is also an important basis for the study of hydrocarbon expulsion process of source rocks. The important mechanism of shale pore formation is compaction, hydrocarbon generation and structural fracturing. Based on these three pore forming mechanisms, shale porosity reduction was calculated by mudstone compaction model, and the vitrinite reflectance, organic carbon content and physical properties of shale were measured. The mathematical model of organic pore and organic carbon variation (螖 C) of shale during the evolution of geological history is established, and the characteristics of structure, lithofacies, diagenesis and stress field are integrated on the basis of fitting the evolution trend model of different genetic pore types. A method for pore restoration of multiple types of shale is established based on pore genesis. This method is used to restore the evolution trend of three genetic types of pores in the lower part of Sha3 formation in Dongying depression of Bohai Bay basin, and to predict the spatial distribution of different genetic types of pores, and to determine the distribution of the total porosity of shale. The prediction results are in good agreement with the real drilling data and the reliability is good.
【作者单位】：中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所;
【基金】：中国石化科技部项目“东部断陷盆地页岩油富集主控因素及选区评价”(P15094)资助
【分类号】：P618.13

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