川中地区下二叠统白云岩储层特征及发育主控因素

发布时间：2018-02-12 21:41

本文关键词： 川中地区茅口组白云岩储层主控因素　出处：《大庆石油地质与开发》2017年04期 　论文类型：期刊论文

【摘要】：为进一步深化对川中地区下二叠统白云岩储层特征及发育主控因素的认识,利用研究区茅口组的岩心、岩屑、薄片鉴定、扫描电镜、碳氧同位素、阴极发光及流体包裹体分析等资料,采用地质分析与地化分析相结合的方法,从岩石学、岩石地球化学及储集空间发育特征等方面进行研究。研究结果表明:茅口组白云岩主要发育砂糖状白云岩、中—细晶白云石、角砾白云岩及少量灰质白云岩,储集空间以溶孔和溶洞为主,溶缝和粒内溶孔次之,白云岩形成过程几乎不受埋深的影响,没有或很少有淡水参与,主要形成于构造—热液环境;储层的岩性组成、白云化作用、构造作用及溶蚀作用是茅口组白云岩储层发育的主控因素,储层的岩性组成是白云岩储层发育的物质基础,适度白云化作用是储层发育的必要条件,构造作用是储层最终发育和空间展布的关键,溶蚀作用是白云岩储层空间展布的重要因素。
[Abstract]:In order to further understand the reservoir characteristics and development control factors of the Lower Permian dolomite in central Sichuan, the core, cuttings, chip identification, scanning electron microscope and carbon and oxygen isotopes of Maokou formation were used in the study area. The data of catholuminescence and fluid inclusion analysis were analyzed by the method of geological analysis and geochemistry analysis. The results show that the dolomite of the Maokou formation is mainly composed of granulated dolomite, meso-fine-grained dolomite, breccia dolomite and a small amount of gray dolomite. The reservoir space is dominated by dissolved pores and caverns, followed by dissolved fractures and dissolved pores in grains. The formation process of dolomite is almost unaffected by buried depth, and it is mainly formed in tectonic-hydrothermal environment, and the lithologic composition of reservoir, and the formation of dolomite is not affected by the depth of burial, and there is little or no fresh water involved in the formation of dolomite. Dolomitization, tectonism and dissolution are the main controlling factors for the development of the dolomite reservoir in Maokou formation. The lithologic composition of the reservoir is the material basis for the development of the dolomite reservoir, and the moderate dolomitization is the necessary condition for the development of the reservoir. Tectonism is the key to the final development and spatial distribution of the reservoir, and dissolution is an important factor in the spatial distribution of dolomite reservoir.
【作者单位】：复杂油气田勘探开发重庆市重点实验室;西南油气田分公司川中油气矿勘探开发研究所;长江大学油气资源与勘探技术教育部重点实验室;
【基金】：国家自然科学基金项目“四川盆地二叠系热液白云岩储层地质模型研究”(41302119)
【分类号】：P618.13

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