渤海海域石臼坨—辽西凸起覆...山储集层发育特征与分布模式_戈道瑶.pdf

书书书第 25 卷第 1 期2023 年2 月古地理学报JOUNAL OF PALAEOGEOGAPHY(Chinese Edition)Vol.25No.1Feb 2023文章编号:16711505(2023)01019817DOI:107605/gdlxb202301013渤海海域石臼坨辽西凸起覆盖型潜山储集层发育特征与分布模式*戈道瑶1，2龚承林1，2张新涛3杨帆1，2余一欣1，2陈宇航41 中国石油大学(北京)地球科学学院，北京 1022492 中国石油大学(北京)油气资源与探测国家重点实验室，北京 1022493 中海石油(中国)有限公司勘探部，北京 1000104 中国石油长庆油田公司勘探开发研究院，陕西西安 710018摘要渤海海域发育勘探潜力巨大的覆盖型潜山，这类潜山储集层的发育特征及分布模式是当前潜山油气勘探研究的重点和难点。利用地震、测井、铸体薄片、井壁岩心、常规物性、扫描电镜和 X 衍射等资料，开展了石臼坨辽西凸起覆盖型潜山储集层的发育特征、主控因素和分布模式研究。研究结果表明:(1)覆盖型潜山以长英质含量较高的混合花岗岩为主，发育多种类型的溶蚀孔隙和裂缝，其中构造裂缝是最主要的储集空间。储集层平均孔隙度为 2.2%，平均渗透率为 0.445103m2。覆盖型潜山自上而下可划分为风化黏土带、风化砂砾岩带、风化裂缝带、裂缝发育带、相对致密带和基岩带。(2)富长英质的岩石为裂缝型储集层的形成提供了物质基础，较高的长英质含量利于构造成缝和风化、淋滤、溶蚀改造。(3)印支期燕山期的强烈隆升是形成优质风化壳储集层的必要条件，而多期次构造作用叠加是潜山规模裂缝型储集层形成的关键，储集层距印支燕山主控断裂的远近和所处构造部位进一步影响了裂缝的发育。(4)风化淋滤对于覆盖型潜山储集层的改造具有重要作用，是控制储集层垂向分带性的主要因素。(5)建立了覆盖型潜山储集层的分布模式，叠合破碎带的风化裂缝带和裂缝发育带是优质储集层的有利发育部位，二层结构潜山风化壳更为发育，多期构造活动叠加区域潜山内幕裂缝带厚度更大，裂缝发育带和破碎带发育更为密集。关键词石臼坨辽西凸起覆盖型潜山储集层特征主控因素分布模式第一作者简介戈道瑶，男，1997 年生，中国石油大学(北京)博士研究生，主要从事储集层地质学和沉积学研究。E-mail:。通讯作者简介龚承林，男，1983 年生，中国石油大学(北京)教授，主要从事深水沉积学和层序地层学研究。E-mail:。中图分类号:TE122文献标志码:A*中海石油(中国)有限公司天津分公司外协科研课题(编号:CCL2020TJX0NST1282)资助。Financially supported by research projectfounded by the CNOOC China Limited Tianjin Branch(No CCL2020TJX0NST1282)收稿日期:20220214改回日期:20220621Characteristics and distribution pattern of the coveredburied-hill reservoirs in ShijiutuoLiaoxi uplift，Bohai SeaGE Daoyao1，2GONG Chenglin1，2ZHANG Xintao3YANG Fan1，2YU Yixin1，2CHEN Yuhang41 College of Geosciences，China University of Petroleum(Beijing)，Beijing 102249，China2 State Key Laboratory of Petroleum esources and Prospecting，China University of Petroleum(Beijing)，Beijing 102249，China第 25 卷第 1 期戈道瑶等:渤海海域石臼坨辽西凸起覆盖型潜山储集层发育特征与分布模式3 Exploration Department of CNOOC China Limited，Beijing 100010，China4 esearch Institute of Petroleum Exploration and Development，PetroChina Changqing Oilfield Company，Xian 710018，ChinaAbstractThe Archaean covered buried hills with great potential are developed in the Bohai sea are-a The characteristics and distribution pattern of such buried-hill reservoirs are the focus and difficulty inthe current research of buried-hill oil and gas exploration Using seismic data，well-log data，thin sec-tions，sidewall cores，conventional physical property，scanning electron microscopy and X diffraction，the current research explored the characteristics，controlling factors and documented distribution patternsof Archaean covered buried-hill reservoirs in Shijiutuo-Liaoxi uplift of the Bohai Bay Basin，resulting infive main lines of observations and results First，observations from the current study suggest that the docu-mented Archaean buried hills is composed mainly of mixed granites and developed various types of dissolu-tion pores and fractures，among which structural fractures are the most important reservoir space The res-ervoir has an average porosity of 2.2%and average permeability of 0.445103m2 The Archaean cov-ered buried-hill reservoirs are composed from base to top of weathered clay zone，weathered conglomeratezone，weathered fracture zone，fracture-developed zone，tight zone and bedrock zone Second，rocksrich in felsic minerals provided the material basis for the formation of fractured reservoirs Higher felsiccontent is conducive to fracture formation and weathering，leaching and dissolution Third，multi-stagetectonics are key to the formation of large-scale fractured，buried-hill reservoirs The strong uplift of In-dosinian and Yanshanian is the necessary condition for the formation of high-quality weathered crust reser-voirs More specifically，the development of fractures was affected by the different structural positions andthe distance between the buried-hill reservoirs and main faults(i.e the Indosinian and Yanshanianfaults)Fourth，weathering and leaching of atmospheric fresh water facilitated the reworking of fracturedand is the main factor controlling the vertical zonation of reservoirs Fifth，the distribution pattern of Ar-chaean covered buried-hill reservoirs was established The overlapped fracture zones in weathered fracturezones and fracture-developed zones represent two main zones for the development of high-quality buried-hillreservoirs The thickness of weathering crust of two-story buried hill is larger The thickness of inner frac-ture zone is larger and the fracture-developed zone and fracture zone of buried hill are more densely deve-loped in the superposition area of multi-stage tectonic activity.Key wordsShijiutuoLiaoxi uplift，covered buried-hill，reservoir characteristics，control factors，distribution patternAbout the first authorGE Daoyao，born in 1997，is a PhD candidate at the China University ofPetroleum(Beijing)His research interests mainly center on reservoir geology and sedimentology E-mail:About the corresponding authorGONG Chenglin，born in 1983，is a professor at the ChinaUniversity of Petroleum(Beijing)His research interests mainly focus on deep-water sedimentology andsequence stratigraphy E-mail:1概述国内外多个大型潜山油气藏的勘探发现使得古潜山油气藏成为了近年来盆地油气勘探的重要接替领域。国外目前已发现的大型古潜山油气藏主要