储层岩性控制下的绿泥石对硅质胶结的影响

发布时间：2018-06-10 09:28

本文选题：西湖凹陷 + 花港组　；参考：《地球科学》2017年09期

【摘要】：在西湖凹陷花港组低渗储层背景下,优质储层的发育伴随绿泥石和硅质胶结的同时富集,这与绿泥石抑制硅质胶结的观点存在矛盾.综合利用X衍射、铸体薄片、包裹体测试和扫描电镜及能谱分析等资料,以绿泥石分类及其成因分析为基础,通过对比不同粒度储层绿泥石和硅质胶结分布规律,结合地层条件和储层质量演化,分析绿泥石对硅质胶结的影响.研究结果表明:绿泥石发育孔隙衬里和孔隙充填两种产状,孔隙衬里绿泥石由早期黏土薄膜重结晶或直接由孔隙流体结晶而成,孔隙充填绿泥石受控于火山碎屑和长石溶蚀;绿泥石和硅质胶结均在物性较好的粗粒储层中富集;浅埋低地温阶段,孔隙衬里绿泥石有效抑制硅质胶结,仅在绿泥石不连续或颗粒破裂处发育孤立柱状石英晶体,深埋高地温阶段,难以有效抑制硅质胶结,多发育石英加大边;粗粒储层比细粒和砂质砾岩及泥砾岩储层孔隙发育,为石英加大边提供必要的生长空间,导致绿泥石相对含量更高的粗粒储层中硅质胶结也更发育.
[Abstract]:Under the background of low permeability reservoir of Huagang formation in Xihu sag, the development of high quality reservoir is accompanied by the simultaneous enrichment of chlorite and siliceous cementation, which contradicts the viewpoint that chlorite inhibits siliceous cementation. Based on the data of X-ray diffraction, thin sheet casting, inclusion testing, scanning electron microscope and energy dispersive analysis, and based on the classification and genetic analysis of chlorite, the distribution of chlorite and siliceous cementation in different grain size reservoirs is compared. Combined with formation conditions and reservoir quality evolution, the influence of chlorite on siliceous cementation is analyzed. The results show that: chlorite develops pore lining and pore filling, pore lining chlorite is formed by early clay film recrystallization or directly by pore fluid crystallization, pore filling chlorite is controlled by pyroclastic and feldspar dissolution; Both chlorite and siliceous cementation are enriched in coarse grained reservoirs with good physical properties. At the stage of shallow buried low ground temperature, pore lining chlorite effectively inhibits siliceous cementation, and only develops isolated columnar quartz crystals at sites of chlorite discontinuity or particle rupture. At the stage of deep buried highland temperature, it is difficult to restrain the siliceous cementation effectively, and the coarse grain reservoir is more developed than fine grain, sandy conglomerate and mud conglomerate reservoir, which provides the necessary growth space for the quartz increasing edge, and the coarse grain reservoir is more developed than fine grain, sand conglomerate and mud conglomerate reservoir. Silica cementation is also more developed in coarse grained reservoirs with higher relative content of chlorite.
【作者单位】：中国石油大学地球科学与技术学院;山东省油藏地质重点实验室;中海石油有限公司上海分公司;
【基金】：国家科技重大专项(No.2016ZX05027-004) 国家自然科学基金面上项目(No.41672129)
【分类号】：P618.13

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