川西龙门山前雷口坡组四段储层特征及形成机理

发布时间：2018-08-04 19:27

【摘要】：川西龙门山前中三叠统雷口坡组雷四上亚段发育厚达百余米的潮坪相白云岩溶蚀孔隙型储层,可分为上、下2个储层段。对钻井岩心、薄片和物性分析表明,以白云岩类为主的下储层段优质储层呈多层叠置分布,储集性能优于灰质含量较多的上储层段。根据不同类型岩石物性统计及储层储集空间特征分析,结合扫描电镜、包裹体分析等技术对储层成因进行研究,认为"白云岩化+准同生期溶蚀+埋藏溶蚀"叠加形成了该套优质储层,其中,区域分布的潮坪相白云岩为储层的稳定广泛分布奠定了重要岩性基础;准同生期溶蚀控制了优质储层多层叠置分布;埋藏溶蚀叠加改造有利于孔隙的保持及储层渗透率的改善,进一步提高了储层的品质。
[Abstract]:The upper submember of Leikoupo formation of Laikoupo formation in Longmen Mountain, western Sichuan Province, developed tidal flat facies dolomite dissolution porosity reservoir with thickness of more than 100 meters, which can be divided into upper and lower reservoirs. The analysis of drilling core, thin slice and physical property shows that the high quality reservoir of the lower reservoir, which is dominated by dolomite, is multi-layer superimposed, and the reservoir performance is better than that of the upper reservoir with more gray content. According to different types of rock physical property statistics and reservoir spatial characteristics analysis, combined with scanning electron microscope, inclusions analysis and other techniques to study the formation of the reservoir, It is considered that the superposition of "pseudo-syntectic dissolution and buried dissolution of dolomitization" forms this set of high quality reservoirs, in which the regional distribution of tidal flat facies dolomite lays an important lithologic foundation for the stable and extensive distribution of the reservoir. The multi-layer superposition distribution of high quality reservoirs is controlled by quasi-syntectic dissolution, and the buried dissolution superposition is beneficial to the preservation of pores and the improvement of reservoir permeability, and further improves the reservoir quality.
【作者单位】：中国石化西南油气分公司勘探开发研究院;成都理工大学沉积地质研究院;
【基金】：中国石化“十条龙”重大科技攻关项目(P16092)资助
【分类号】：P618.13

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