石油学报 ›› 2021, Vol. 42 ›› Issue (8): 1003-1014.DOI: 10.7623/syxb202108003

• 地质勘探 • 上一篇    下一篇

高能辫状河沉积特征及砂体分布——以苏东X密井网区为例

卢志远1,2, 何治亮2,3, 马世忠4, 何宇5, 牛东亮5, 聂海宽2,6, 朱杰7   

  1. 1. 中国地质大学(北京)能源学院 北京 100083;
    2. 页岩油气富集机理与有效开发国家重点实验室 北京 100083;
    3. 中国石油化工集团有限公司科技部 北京 100728;
    4. 东北石油大学地球科学学院 黑龙江大庆 163318;
    5. 中国石油吉林油田公司勘探开发研究院 吉林松原 138003;
    6. 中国石油化工股份有限公司石油勘探开发研究院 北京 100083;
    7. 中国石油新疆油田公司油田技术服务分公司 新疆克拉玛依 834000
  • 收稿日期:2020-03-02 修回日期:2021-02-10 出版日期:2021-08-25 发布日期:2021-08-31
  • 通讯作者: 何治亮,男,1963年9月生,1982年获武汉地质学院石油地质专业学士学位,2000年获中国地质大学(武汉)矿产普查与勘探专业博士学位,现为中国石油化工集团有限公司科技部副总经理、教授级高级工程师,长期从事石油与天然气地质学研究工作。Email:hezhiliang@sinopec.com
  • 作者简介:卢志远,男,1992年9月生,2016年获西安石油大学地质学专业学士学位,现为中国地质大学(北京)能源学院博士研究生,主要从事石油天然气地质学方向研究工作。Email:1443306099@qq.com
  • 基金资助:
    国家自然科学基金项目"水平井河道砂体内部构型及对三次采油期剩余油形成机制的研究"(No.41272153)和中国石油化工集团有限公司科技部项目"杭锦旗十里加汗复杂气藏定量表征及开发对策"(P19019-1)、"东胜气田精细表征及有效开发技术"(P20065-2)资助。

Characteristics and sand distribution of high-energy braided river deposits: a case study of X tight well area in eastern Sulige region

Lu Zhiyuan1,2, He Zhiliang2,3, Ma Shizhong4, He Yu5, Niu Dongliang5, Nie Haikuan2,6, Zhu Jie7   

  1. 1. School of Energy Resource, China University of Geosciences, Beijing 100083, China;
    2. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China;
    3. Department of Science and Technology, China Petroleum & Chemical Corporation, Beijing 100728, China;
    4. School of Geosciences, Northeast Petroleum University, Heilongjiang Daqing 163318, China;
    5. Research Institute of Exploration and Development, PetroChina Jinlin Oilfield Company, Jilin Songyuan 138003, China;
    6. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China;
    7. Oilfield Technical Service Company, PetroChina Xinjiang Oilfield Company, Xinjiang Karamay 834000, China
  • Received:2020-03-02 Revised:2021-02-10 Online:2021-08-25 Published:2021-08-31

摘要: 下石盒子组8段下亚段(盒8下段)是苏里格地区主要的含气层段之一。为了认识苏里格地区盒8下段辫状河砂体发育特征及有效砂体叠合模式,厘清剩余油气制约因素,在高分辨层序地层学和沉积动力学分析的基础上,结合现代沉积、露头、岩心、测井、录井等资料,在密井网区,开展了地下高能砂质辫状河沉积特征、界面约束条件下的河道发育模式及砂体分布研究。研究结果表明,盒8下段发育高能水动力为主的辫状河沉积,沉积微相包括辫状河心滩、辫状河道,少量决口扇、泛滥平原。辫流河道砂体以水平叠置型为主,河道迁移频繁,砂体垂向上相互切叠、平面上大面积连片、非均质性强。基准面升降控制河道沉积,进而控制砂体发育模式和有利储层。研究区主要砂体叠置模式可归纳为独立式、接触式、切叠式和多期切叠式。低可容纳空间砂体形态主要是切叠式和多期切叠式,砂体连通性好,河漫细粒沉积不发育。高可容纳空间的细粒沉积明显增多,砂体以接触式和孤立式分布为主,砂体连通性变差。在中期基准面旋回上升半旋回的中—下部,高能水动力环境下形成的叠置型砂体是油气富集的主要空间,主要位于5级界面上部;较低能水动力环境下形成的细粒沉积构成了主要的隔夹层,影响油气渗流。

关键词: 辫状河沉积, 沉积相, 界面级次, 砂体形态, 下石盒子组8段下亚段, 苏里格地区

Abstract: The lower submember of the Member 8 of Xiashihezi Formation(H8d) is the main gas-bearing layer in the Sulige area. In order to understand the development characteristics of braided river sand body in the H8d in Sulige area, the model of superposition of effective sand body and the restriction factors of residual oil and gas were clarified. Based on the analysis of high-resolution sequence stratigraphy and sedimentary dynamics, combined with modern sedimentary, outcrop, core, logging and other data, the underground sandy braided river sedimentary characteristics, patterns of river development under interface constraints and sand distribution are carried out in the tight well area. The results show that high energy hydrodynamic braided channel deposits are developed in the H8d. Sedimentary microfacies include braided bar (traneverse bar, longitudinal bar and lateral bar), channel filling, etc. The braided channel sand body is mainly composed of horizontal superposition type, the channel migration is frequent, and the sand body is superimposed vertically. The plane is connected in large areas, and the heterogeneity is strong. The sedimentation of the channel is controlled by the base level cycles, and the development pattern of the sand body and the favorable reservoir are controlled. The contact mode of sand body is classified as independent type, contact type, superimposed type and multi-stage superimposed type. The superimposed type and multi-stage superimposed in low accommodation space have good connectivity, and the channel bank deposits are not developed. The fine grain deposition increased obviously in high accommodating space, and the sand body was mainly distributed by contact type and isolated type. Thus, the sand body connectivity became worse. In the middle and lower part of the rising semi-cycle of medium-term base-level cycle, the superimposed sand body formed under high energy hydrodynamic environment is the main space for oil and gas enrichment, which is mainly located in the upper part of the fifth level interface. The fine grain deposits formed under low energy hydrodynamic environment formed the main barrier and interlayer, which affected the oil and gas flow.

Key words: braided river deposits, sedimentary facies, interface grades, sand body style, lower submember of the Member 8 of Xiashihezi Formation, Sulige area

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