咸化湖盆混积岩分类与混积相带沉积相特征——以准噶尔盆地南缘芦草沟组与吐哈盆地西北缘塔尔朗组为例

发布时间：2018-04-11 06:13

本文选题：混积岩 + 岩相　；参考：《石油学报》2017年09期

【摘要】：通过露头精细观察、薄片鉴定与X射线衍射等方法,对具有咸水沉积背景的准噶尔盆地南缘芦草沟组与吐哈盆地西北缘塔尔朗组的混积特征进行研究,提出"混积相带"的概念来表征"湖盆中发育混积岩和混积层系的相带",并厘定了研究区"混积岩"的定义,建立一种新的混积岩分类命名方案,进而系统研究了混积相带的岩相、沉积相特征,并预测了有利相区。"混积岩"为"陆源碎屑与内源非后期成岩作用形成的碳酸盐组分在同一岩层内混合形成的沉积岩",陆源碎屑与碳酸盐组分的含量不存在一个具体的下限标准。研究区混积相带内大部分粉砂岩、碳酸盐岩与泥页岩和少部分砂岩主要由陆源碎屑颗粒、碳酸盐组分和黏土矿物构成,属于混积岩,以三组分的相对含量50%为界将混积岩划分为(粉)砂岩、碳酸盐岩和正混积岩3大类,进一步划分为9小类。在此基础上,根据露头的岩性、粒度、沉积构造和颜色等特征在混积相带内共识别出21种岩相类型和9种岩相组合,依此将混积相带划分为近岸水下扇外扇、扇三角洲前缘、浊积扇和半深湖—深湖。综合露头观察、有机碳测试、物性测试及扫描电镜观察等方法,认为半深湖—深湖与浊积扇为混积相带内的有利相区,二者内部的烃源岩、储集岩条件相对较好,可形成良好的生储组合。
[Abstract]:Through the outcrop observation, thin section analysis and X ray diffraction method, with salt water sedimentary background of Lucaogou Formation in southern margin of Junggar basin and Tuha basin in the northwestern margin of the thar Lang hunji group characteristic research, put forward "hunji facies" concept to characterize the basin development of hunji rock and hunji sequence the belt ", and defined the definition of" hunji rock ", the establishment of a new hunji rock classification and naming scheme, system of mixed facies belt lithofacies, sedimentary facies, and to predict favorable facies." hunji rock "into" debris and endogenous non Lu Yuan "the late sedimentary rocks into carbonate group formation in the same strata in the mixed form, Lu Yuan clastic and carbonate component content does not have a specific minimum standards. The study area of hunji facies most siltstone, carbonate rock and shale and sandstone is mainly composed of a small part of the land The source of detrital carbonate composition, composition and clay minerals, which belongs to the mixosedimentite in 50%, the relative content of three components for the community will be divided into hunji rock (powder) sandstone, carbonate rock and hunji rock is further divided into 3 categories, 9 small classes. On this basis, according to the outcrop lithology the size, color and other characteristics, sedimentary structure and sedimentary facies in the mixed zone identified 21 lithofacies and 9 lithofacies, sedimentary facies belt can be mixed into the nearshore subaqueous fan and outer fan, fan delta, turbidite fan and semi deep lake and deep lake. Comprehensive outcrop observation, organic carbon test, physical test and scanning electron microscopy method, that the semi deep to deep lacustrine and turbidite fan facies as hunji in favorable facies zone, hydrocarbon source rocks within the two, reservoir conditions are relatively good, students can form good reservoirs.

【作者单位】：中国石油大学地球科学与技术学院;中国石油化工股份有限公司胜利油田分公司勘探开发研究院;中国石油化工集团公司胜利石油管理局博士后科研工作站;中国石油化工股份有限公司胜利油田分公司东胜集团股份公司;
【基金】：国家自然科学基金项目(No.41372107)资助
【分类号】：P618.13

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