辽河坳陷大民屯凹陷古近系沙河街组三段沉积相  

Sedimentary facies of the third Member of Pleoagene Sahehjie Formation from the Damintun sag,Liaohe depression

作　　者：林春明[1] 黄舒雅 江凯禧 张霞[1] 夏长发 陶欣 李铁军[2] LIN Chunming;HUANG Shuya;JIANG Kaixi;ZHANG Xia;XIA Changfa;TAO Xin;LI Tiejun(School of Earth Sciences and Engineering,Nanjing University,Nanjing,Jiangsu 210023,China;Research Institute of Petroleum Exploration and Development,PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China)

机构地区：[1]南京大学地球科学与工程学院,江苏南京210023 [2]中石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《地质学报》2023年第6期2002-2025,共24页Acta Geologica Sinica

基　　金：“辽河油田千万吨稳产关键技术研究与应用”重点专项课题“高凝油油藏水驱后期储层精细描述与评价”(编号2017E-1063)资助的成果。

摘　　要：辽河坳陷大民屯凹陷沈84—安12区块古近系沙河街组三段是油气勘探的重点目的层系。综合钻井、岩芯、录测井和分析化验等资料,利用物源区分析、碎屑组分、重矿物和粗粒/细粒沉积物平面分布等多种方法探讨了研究区物源体系特征和来源;运用沉积学基本原理和方法,开展了沙三段的沉积相及其演化特征研究。结果表明,大民屯凹陷沙三段主要来自新太古代—古元古代变质岩基底和中生代多期次构造运动过程中生成的中酸性火成岩的再旋回沉积,同时受中生代晚期的幔源物质影响,主物源方向为北和北东向。研究区沙三段Es_(3)~4Ⅱ和Es_(3)~4Ⅰ油层组主要发育浅水扇三角洲前缘沉积,划分为水下分流河道、水下分流间湾(富砂)和水下分流间湾(富泥)沉积微相;自Es_(3)~4Ⅱ到Es_(3)~4Ⅰ油层组沉积期,湖盆水体深度由浅变深,水下分流河道和水下分流间湾(富砂)微相分布范围逐渐减少,水下分流间湾(富泥)逐渐增加。The third Member of the Paleogene Shahejie Formation is the primary target in petroleum exploration of the Shen84—An12 block which is located in the Damintun sag,Liaohe depression.Based on a compilation of data from drilling,core,well logging,and related analytical experiments,multiple methods were used to infer the characteristics of the provenance system,such as analyses of potential provenance direction,detrital composition,light and heavy mineral assemblages and variation of coarse/fine-grained sediment planar distribution.The fundamental principles of sedimentology were applied to investigate the sedimentary facies and their evolution in the third Member of the Paleogene Shahejie Formation.The results show that the third Member of the Paleogene Shahejie Formation is mainly derived from the recycled sedimentation of the Neoarchean to Paleoproterozoic metamorphic basement,and the Mesozoic intermediate-acidic igneous rocks formed in various tectonic movements,and was subsequently influenced by the Late Mesozoic mantle-derived material.We inferred the primary provenance directions are mainly north to east and northeast to southwest.The Es_3~4Ⅱ and Es_3~4Ⅰ oil formations from the third Member of the Paleogene Shahejie Formation were deposited in the shallow-water fan delta front,and were further divided into underwater distributary channel,underwater distributary bay(sand-rich) and underwater distributary bay(mud-rich) microfacies.The paleo-lacustrine environment in the research area changed the water depth from shallow to deep during the sedimentation of the Es_3~4Ⅱ to Es_3~4Ⅰ,while the distribution range of the underwater distributary channel and the underwater distributary bay(sand-rich) decreased,and the underwater distributary bay(mud-rich) gradually increased.

关 键 词：大民屯凹陷 沈84—安12区块 沙河街组三段 物源 沉积相 

分 类 号：P618.13[天文地球—矿床学]