同生逆断层控制的砂砾岩沉积模式及有利储集相带分布——以玛湖凹陷南斜坡白25井区上乌尔禾组为例

发布时间：2018-05-27 12:26

本文选题：玛湖凹陷南斜坡 + 上乌尔禾组　；参考：《沉积学报》2017年06期

【摘要】：通过岩芯相—测井相—地震相—分析化验数据对比,结合砂砾岩沉积野外考察实践综合归纳分析,认为上乌尔禾组同生逆断层控制的冲积扇—扇三角洲砂砾岩沉积体系整体呈进积式沉积,具"冲积扇扇根(槽流带)—冲积扇扇中/扇三角洲平原(辫流带)—扇三角洲前缘(水下分流带)—前扇三角洲/滨浅湖(夹杂水下扇)"相序特征,发育槽流、泥石流/砂质碎屑流、辫状河道、水下分流河道、扇面水道五种典型砂砾岩沉积微相类型。同生逆断层带不断抬升剥蚀的累积效应,使近物源区冲积扇扇根沉积整体减薄,同时使同生逆断层控制沉积相带分异的趋势越来越明显。泥质含量是控制挤压背景下砂砾岩储层质量的关键因素,贫泥砂砾岩储层成岩压实减孔效应弱,剩余粒间孔发育,且粗粒级颗粒内部多发育压碎缝沟通粒间孔隙,储层质量最佳。依据储集空间组合类型将有利储集相带分为原生粒间孔—压碎缝发育带、原生粒间孔—次生溶孔发育带两大类。前者主要分布于构造高部位近断裂带—中上斜坡带;后者主要分布于中下部斜坡带。
[Abstract]:Based on the comparison of core facies, logging facies, seismic facies and analysis data, combined with the field investigation of sandy gravel deposits, the comprehensive induction and analysis are made. It is considered that the sedimentary system of alluvial fan-fan delta sandstones controlled by the syngenic reverse faults of the Upper Wuerhe formation is an integral precession deposit. It is characterized by "alluvial fan root (trough current zone / alluvial fan middle / fan delta plain" (braided zone / fan delta front (underwater distributary zone) -front fan delta / shoreside shallow lake (inclusion underwater fan) facies sequence characteristic, developed trough flow, There are five typical sedimentary microfacies types: debris flow / sandy debris flow, braided channel, underwater distributary channel and sector channel. The cumulative effect of continuous uplift and denudation of syngenic reverse fault zone makes the deposition of alluvial fan roots in the near-provenance region decrease as a whole, and the trend of controlling sedimentary facies zone differentiation by syngenic reverse fault becomes more and more obvious at the same time. The content of mud is the key factor to control the quality of sand and gravel reservoir under the extrusion background. The diagenetic compaction reduction effect is weak, the residual intergranular pore is developed in the poor mud sand gravel reservoir, and the intergranular pore is more developed in the coarse grained grain, and the crushed fracture communicates with the intergranular pore in the coarse grained grain. The reservoir quality is the best. According to the type of reservoir space assemblage, the favorable reservoir facies zone is divided into two types: primary intergranular pore zone, primary intergranular pore zone and secondary dissolved pore zone. The former is mainly distributed in the near fault zone and the middle and upper slope zone in the high part of the structure, while the latter is mainly distributed in the middle and lower slope zone.
【作者单位】：中国石油杭州地质研究院;新疆油田公司勘探开发研究院;
【基金】：%E7%A7%91%E6%8A%80%E6%94%BB%E5%85%B3%E9%A1%B9%E7%9B%AE(HX132-41528-15)~~" target="_blank">中油股份公司<新疆大庆>科技攻关项目(HX132-41528-15)~~
【分类号】：P618.13

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