致密湖相碳酸盐岩油气富集模式及稳产、高产主控因素——以柴达木盆地英西地区为例

发布时间：2018-04-27 05:07

本文选题：柴达木盆地 + 咸化湖盆　；参考：《西北大学学报(自然科学版)》2017年05期

【摘要】：基于岩心观察和系统的微观岩石学和结构学特征研究,探究了英西地区渐新统的储集层特征、油气富集模式及稳产、高产主控因素:(1)目的层岩性以湖相碳酸盐岩为主,可分为盐间和盐下两套地层,盐间广泛发育厚盐层,以石盐为主,盐下零星发育薄盐层,以硬石膏为主;(2)咸化条件下沉积的这套细粒的湖相碳酸盐岩,既是品质最好的烃源岩,又发育白云岩"甜点"储集层,具有自生自储特征(上部盐层因具有很高的毛管突破压力和塑性特征而具有很强的封盖能力,且盐下应力集中造缝),其多因素的良好匹配形成了盐下油气规模富集的有利区;(3)基质晶间孔的发育程度控制着油气藏的规模和稳产,微裂缝的发育程度控制着油气藏的富集和高产。这一研究成果对深入研究英西E_3~2盐下油气的分布规律和下一步勘探部署具有重要的指导意义。
[Abstract]:On the basis of core observation and systematic study of microscopic petrology and structural characteristics, the reservoir characteristics, oil and gas enrichment model and stable production of the Oligocene in Yingxi area are studied. The lithology of the target layer is dominated by lacustrine carbonate rock. This set of fine-grained lacustrine carbonate rocks deposited under salt conditions is the best source rock. The dolomite "dessert" reservoir is also developed, which has the characteristics of self-generation and self-storage (the upper salt bed has strong sealing ability due to its high capillary breakthrough pressure and plastic characteristics. Moreover, the good matching of many factors in the formation of subsalt stress concentrated fracture formation results in the formation of a favorable area of oil and gas scale enrichment under salt, I. e., the development of matrix intergranular pores, which controls the scale and stable production of oil and gas reservoirs. The development of microfractures controls the enrichment and high yield of oil and gas reservoirs. This research result is of great significance for the further study of the distribution of oil and gas under E3C salt and the further exploration and deployment.
【作者单位】：中国石油天然气集团公司油藏描述重点实验室;中国石油勘探开发研究院西北分院;中国石油天然气股份有限公司青海油田分公司;
【基金】：国家油气专项基金资助项目(2016ZX05003006) 中国石油重大科技专项基金资助项目(2011E-03)
【分类号】：P618.13

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