海拉尔盆地贝中次凹南屯组成岩作用及优质储层主控因素  

Diagenesis and main controlling factors of high quality reservoirs of Nantun Formation in Beizhong sub-sag,Hailar Basin

作　　者：李玲玲 刘剑营[2] 王永超[1,2] LI Ling-ling;LIU Jian-ying;WANG Yong-chao(Key Laboratory of Compact Oil and Mudstone Oil Reservoir Formation Research in Heilongjiang Province,Daqing 163712,Heilongjiang,China;Exploration and Development Research Institute of Daqing Oilfield Company Ltd.,Daqing 163712,Heilongjiang,China)

机构地区：[1]黑龙江省致密油和泥岩油成藏研究重点实验室,黑龙江大庆163712 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《世界地质》2019年第3期774-780,共7页World Geology

基　　金：大庆油田有限责任公司《海拉尔盆地乌尔逊—贝尔凹陷储层特征及分布研究》(5100378)

摘　　要：南屯组是贝中次凹重要的勘探层位,其储层中发育火山碎屑岩。运用普通薄片、铸体薄片、扫描电镜、X-射线衍射及茜素红染色等技术方法,系统分析了贝中次凹南屯组的成岩作用特征及优质储层的主控因素。储层岩石类型包括凝灰岩、沉凝灰岩、凝灰质砂岩和砂岩。储层经历了较强的成岩作用,综合分析有机质成熟度、黏土矿物组合和自生矿物组合等参数,将南屯组成岩阶段划分为中成岩A期。以影响储层物性的主控成岩作用及其强度将南屯组划分为压实相、胶结相和溶解相3种成岩相类型,其中溶解相对储集空间发育最有利。优质储层控制因素包括:①发育优势沉积相-扇三角洲前缘;②溶解作用改善储集性能,包括长石、岩屑、方解石胶结物和凝灰质填隙物的溶解,其中凝灰质填隙物的溶解最为关键。Nantun Formation is an important exploration target in Beizhong sub-sag,with volcanic clastic rocks developed in its reservoirs.The diagenesis characteristics and the main controlling factors of high-quality reservoirs of Nantun Formation were systematically analyzed using ordinary thin sections,cast thin sections,scanning electron microscopy,X-ray diffraction and alizarin red staining.The reservoir rock consists of tuff,sediment-tuff,tuff sandstone and sandstone.The reservoir has experienced strong diagenesis,which is defined as mid-diagenetic stage A through comprehensive analysis of organic matter maturity,clay mineral combination and autogenic mineral assemblage.Three types of diagenetic facies(compaction facies,cementation facies and dissolution facies)have been identified in Nantun Formation based on the main diagenesis and its strength,which affect the reservoir physical properties.Among which the dissolution facies is most favorable for the development of storage space.The main controlling factors of high-quality reservoirs include:①dominant sedimentary facies-the fan delta front;②dissolution,which improves storage performance,including dissolution of feldspar,rock debris,calcite and tuff cement,of which the dissolution of tuff cement is most critical.

关 键 词：海拉尔盆地 贝中次凹 南屯组 成岩作用 主控因素 

分 类 号：P618.130[天文地球—矿床学]