塔里木盆地库车坳陷克深地区白垩系低孔砂岩储层“三重介质特征”

发布时间：2018-05-18 19:15

本文选题：库车坳陷 + 非常规　；参考：《天然气地球科学》2017年02期

【摘要】：塔里木盆地库车坳陷克深气田巴什基奇克组属于低孔裂缝性砂岩储层,储层埋藏深度大,基质致密,裂缝发育。由于该气田储层孔喉细小、结构复杂,传统孔喉表征技术难以定量系统表征,综合激光共聚焦扫描、场发射扫描电镜、微米CT、氮气吸附和核磁共振等先进孔喉表征技术,首次发现库车坳陷克深气田储层基质微观呈"三重介质"特征,即大孔喉介质、小孔喉介质和裂缝,其中大孔喉介质和小孔喉介质所占储集空间比重相当,但大孔喉介质对基质渗透率贡献率达95%以上;储层孔喉配置关系以大孔隙—粗喉道、小孔隙—细喉道配置为主,其次为小孔隙—粗喉道。研究区裂缝孔隙度仅占储集空间的1.8%~2.8%,但裂缝性砂岩岩心渗透率比基质渗透率高1~2个数量级。基于此建立了研究区砂岩储层"三重介质"概念模型,该模型可以很好解释储层渗流特征。
[Abstract]:The Bashiqike formation of Ke Shen gas field in Kuqa depression of Tarim Basin belongs to low porosity fractured sandstone reservoir with large burial depth dense matrix and developed fractures. Because the pore throat of this gas field is small and complicated, the traditional pore throat characterization technology is difficult to quantify systematically. The advanced pore throat characterization techniques, such as laser confocal scanning, field emission scanning electron microscope, micrometer CTM, nitrogen adsorption and nuclear magnetic resonance, are integrated. It is first found that the reservoir matrix of Ke Shen gas field in Kuqa depression is characterized by "triple medium", that is, large pore throat medium, small pore throat medium and fracture, in which large pore throat medium and small pore throat medium account for the same proportion of reservoir space. However, the contribution rate of macropore throat medium to matrix permeability is more than 95%, and the relationship between pore and throat distribution is mainly composed of macropore and coarse throat, small pore and fine throat, followed by small pore and coarse throat. The porosity of fracture is only 1.8% of the reservoir space, but the permeability of fractured sandstone core is 1 ~ 2 orders of magnitude higher than that of matrix. Based on this, a concept model of "triple medium" for sandstone reservoir in the study area is established, which can explain the percolation characteristics of the reservoir well.
【作者单位】：中国石油塔里木油田分公司勘探开发研究院;中国石油塔里木油田分公司开发事业部;中国石油大学地球科学与技术学院;
【基金】：中国石油重大科技专项“塔里木油田勘探开发关键技术研究与应用”(编号:2014E-2104) 国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05015-005) 国家自然基金面上项目(编号:(41572124)7) 中央高校基本科研业务费专项资金(编号:14CX05016A)联合资助
【分类号】：P618.13;TE312

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