岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 102–113.doi: 10.12108/yxyqc.20210611

• 油气地质 • 上一篇    下一篇

辽河西部凹陷雷家地区古近系沙三段沉积体系及层序地层

王乔1, 宋立新2, 韩亚杰1, 赵会民2, 刘颖3   

  1. 1. 吉林大学 地质博物馆, 长春 130026;
    2. 中国石油长城钻探工程公司 地质研究院, 辽宁 盘锦 124010;
    3. 辽宁经济职业技术学院 信息工程系, 沈阳 110122
  • 收稿日期:2020-12-10 修回日期:2021-02-23 出版日期:2021-12-01 发布日期:2021-11-25
  • 第一作者:王乔(1986-),女,硕士,高级工程师,主要从事沉积学方面的研究工作。地址:(130026)吉林省长春市朝阳区西民主大街938号地质宫。Email:1977936306@qq.com。
  • 基金资助:
    国家油气科技重大专项“四川盆地及周缘页岩气形成富集条件、选区评价技术与应用”（编号：2017ZX05035）资助

Depositional system and sequence stratigraphy of the third member of Paleo-gene Shahejie Formation in Leijia area, Western Liaohe Depression

WANG Qiao1, SONG Lixin2, HAN Yajie1, ZHAO Huimin2, LIU Ying3   

  1. 1. Geological Museum of Jilin University, Changchun 130026, China;
    2. Geological Research Institute, PetroChina Greatwall Drilling Company, Panjin 124010, Liaoning, China;
    3. Department of Information Engineering, Liaoning Provincial College of Vocational Technology in Economics, Shenyang 110122, China
  • Received:2020-12-10 Revised:2021-02-23 Online:2021-12-01 Published:2021-11-25

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摘要： 辽河西部凹陷雷家地区古近系沙三段是该区的主要含油层系之一，为了弄清该段储层的沉积特征及展布规律，基于沉积学和层序地层学理论，综合应用钻井、岩心、测井及地震等资料，在层序地层格架内对该段的沉积相类型、沉积体系展布等开展了研究。根据各层序边界在岩性、测井、地震及古生物等资料上的标志特征，认为雷家地区沙三段可划分为3个三级层序：SQ1，SQ2和SQ3，各三级层序均又细分为低位体系域（LST）、湖侵和高位体系域（TST+HST）；该区主要发育扇三角洲相和湖泊相，其中扇三角洲包括扇三角洲平原、扇三角洲前缘、前扇三角洲等3种亚相，进一步划分为辫状河道、水下分流河道、水下分流河道间、河口坝等微相，湖泊相包括滨浅湖亚相和半深湖-深湖亚相；SQ1扇三角洲砂体的沉积特征受控于断裂活动、古地貌形态及物源供给；在东部陡坡带，SQ1的LST扇三角洲砂体与上覆TST+HST和SQ2的泥岩形成上生下储式生储组合，是岩性油气藏有利的勘探目标。该研究成果对雷家地区岩性油气藏的勘探具有指导意义。

关键词: 沉积体系, 层序地层, 岩性油气藏, 沙三段, 辽河西部凹陷

Abstract: The third member of Paleogene Shahejie Formation is one of the main oil-bearing series in Leijia area of Western Sag, Liaohe Depression. In order to clarify the sedimentary characteristics and distribution regularity of the reservoir, based on the theory of sedimentology and sequence stratigraphy, the sedimentary facies types and distribution characteristics under sequence framework were summarized by using core, drilling, logging and seismic data. According to sequence boundary markers, such as lithological mutation, logging changes, seismic reflection and paleontology data, Es3 in Leijia area can be divided into three third-order sequences: SQ1, SQ2 and SQ3, which were composed of lowstand systems tract(LST), transgressive systems tract(TST) and highstand systems tract(HST) respectively. Fan delta facies and lacustrine facies are mainly developed in this area. The fan delta facies includes three subfacies: fan delta plain, fan delta front and pro-fan delta, which can be further divided into several microfacies: braided channel, underwater distributary channel, underwater distributary interchannel and mouth bar. The lacustrine facies includes two subfacies: shore-shallow lacustrine and semideep to deep lacustrine. The sedimentary characteristics of fan delta sand bodies of SQ1 are confined by fault activities, palaeogeomorphology and sedimentary source recharge. The above-generation and below-storage assemblage formed by fan delta front sand bodies of the LST of SQ1 and the mudstone of the TST and HST of SQ1 and SQ2 in the east steep slope is the favorable exploration target for lithologic reservoirs. The research results have guiding significance for further exploration of lithologic reservoirs in Leijia area.

Key words: depositional system, sequence stratigraphy, lithologic reservoirs, the third member of Shahejie Formation, Western Liaohe Depression

中图分类号: 

  • TE121.3
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