石油学报 ›› 2018, Vol. 39 ›› Issue (7): 727-743.DOI: 10.7623/syxb201807001

• 地质勘探 •    下一篇

陆相断陷湖盆低渗透碎屑岩储层特征及相对优质储层成因——以济阳坳陷东营凹陷古近系为例

操应长1,2, 杨田1, 宋明水3, 王艳忠1, 马奔奔4, 王健1, 远光辉1, 葸克来1   

  1. 1. 中国石油大学地球科学与技术学院 山东青岛 266580;
    2. 青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室 山东青岛 266071;
    3. 中国石油化工股份有限公司胜利油田分公司油气勘探管理中心 山东东营 257017;
    4. 中国地质大学能源学院 湖北武汉 430074
  • 收稿日期:2017-09-13 修回日期:2018-01-09 出版日期:2018-07-25 发布日期:2018-08-01
  • 通讯作者: 杨田,男,1989年9月生,2011年获中国石油大学(华东)地质学专业学士学位,2017年获中国石油大学(华东)地质学专业博士学位,现为中国石油大学(华东)博士后,主要从事沉积学和油气储层地质学研究工作。Email:yangtian9645@126.com
  • 作者简介:操应长,男,1969年1月生,1992年获石油大学(华东)沉积地质学专业学士学位,2003年获中国科学院广州地球化学研究所博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事沉积学、层序地层学及油气储层地质学方面的教学与科研工作。Email:cyc8391680@163.com
  • 基金资助:

    国家科技重大专项(2016ZX05006-003)、中国博士后科学基金面上项目(2017M622314)、山东省自然科学基金博士基金项目(ZR2018BD010)和中央高校基本科研业务费专项资金项目(15CX08001A)资助。

Characteristics of low-permeability clastic reservoirs and genesis of relatively high-quality reservoirs in the continental rift lake basin: a case study of Paleogene in the Dongying sag, Jiyang depression

Cao Yingchang1,2, Yang Tian1, Song Mingshui3, Wang Yanzhong1, Ma Benben4, Wang Jian1, Yuan Guanghui1, Xi Kelai1   

  1. 1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Shandong Qingdao 266071, China;
    3. Oil and Gas Exploration Management Center, Sinopec Shengli Oilfield Company, Shandong Dongying 257017, China;
    4. Faculty of Earth Resources, China University of Geosciences, Hubei Wuhan 430074, China
  • Received:2017-09-13 Revised:2018-01-09 Online:2018-07-25 Published:2018-08-01

摘要:

针对低渗透储层特征及其成因研究中存在的问题,综合岩心观察、薄片鉴定、分析测试等技术方法,以盆地结构为约束条件,对东营凹陷低渗透储层特征及相对优质储层成因进行了研究。研究结果表明:①断陷湖盆不同沉积相类型储层岩石学特征、物性特征、孔喉结构、成岩作用、油气成藏及成岩演化等特征差异显著。②压实作用和胶结作用是储层物性降低的主要控制作用,溶蚀作用和油气充注一定程度上改善储层物性、延缓低渗发生时间,并在其综合控制下发育5种低渗成因储层类型。③储层与烃源岩侧接的陡坡带砂砾岩以压实作用主控的低渗成因储层为主,储层被烃源岩包裹的洼陷带浊积岩以溶蚀主控的低渗成因储层为主,储层与烃源岩远离的缓坡带滩坝砂以胶结作用主控的低渗成因储层为主。④沉积作用控制下的差异抗压实作用形成砂砾岩与滩坝砂储层整体低渗背景下的中-高孔隙度、中-高渗透率相对优质储层;成岩作用控制下的长石溶蚀增孔及储层润湿性改变,促进油气充注进而抑制碳酸盐胶结作用,形成浊积岩与滩坝砂储层整体低渗背景下的低渗、中-高孔隙度相对优质储层。

关键词: 低渗透储层, 相对优质储层, 成因, 成岩作用, 古近系, 东营凹陷, 断陷湖盆

Abstract:

Base the problems in the study of characteristics and genesis of low-permeability reservoirs, the characteristics of low-permeability reservoirs and the genesis of relatively high-quality reservoirs in the Dongying sag are analyzed through core observation, thin-section identification, analytical testing and other technologies, with the basin structure as a constraint condition. The study results show that:(1) In continental rift lake basin, the reservoirs of various sedimentary facies are significantly different in petrological characteristics, physical features, pore-throat structures, diagenesis, hydrocarbon accumulation and diagenetic evolution. (2) Compaction and cementation are the dominating factors for reducing the physical properties of reservoirs. On the contrary, the dissolution and hydrocarbon charging will improve the physical properties of reservoirs and delay the occurrence time of low permeability. Under this combined control, five types of low-permeability reservoirs are developed. (3) In the steep slope zone of reservoirs laterally connected to source rocks, the glutenite is dominated by the low permeability reservoirs mainly under the effect of compaction. The turbidite in the sag zone enfolded by source rocks is dominated by the low-permeability reservoirs mainly under the effect of dissolution. The beach bar in the gentle slope zone with reservoirs far away from source rocks is dominated by the low-permeability reservoirs mainly under the effect of cementation. (4) The relatively high-quality reservoirs with mid-high porosity and permeability are formed in the glutenite and beach-bar reservoirs under the condition of low permeability due to the compaction difference controlled by sedimentation. The feldspar dissolution-enlarged pores occur under the control of diagenesis, as well as the changes in reservoir wettability. This promotes hydrocarbon charging to inhibit the carbonate cementation, thus forming the relatively high-quality reservoirs with mid-high porosity and low permeability in the turbidite and beach-bar reservoirs under the condition of low permeability.

Key words: low-permeability reservoir, relatively high-quality reservoirs, genesis, diagenesis, Paleogene, Dongying sag, continental rift basin

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