石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (2): 380-391.doi: 10.11743/ogg20190216

• 油气地质 • 上一篇    下一篇

川西地区龙门山前带侏罗系物源与沉积体系演化

邓莉1, 刘君龙2, 钱玉贵1, 张世华1, 王天云3, 于海跃4   

  1. 1. 中国石化 西南油气分公司 勘探开发研究院, 四川 成都 610041;
    2. 中国石化 石油勘探开发研究院, 北京 100083;
    3. 中国石油 东方地球物理公司新兴物探开发处, 河北 涿州 072751;
    4. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249
  • 收稿日期:2018-03-20 修回日期:2018-11-30 出版日期:2019-04-28 发布日期:2019-01-23
  • 第一作者简介:邓莉(1968-),女,高级工程师,石油地质。E-mail:dengli.xnyq@sinopec.com。
  • 基金项目:
    国家科技重大专项(2016ZX05002-006);国家自然科学基金项目(41672098)。

Provenance and sedimentary system of the Jurassic successions in the front of Longmen Mountain in western Sichuan Basin

Deng Li1, Liu Junlong2, Qian Yugui1, Zhang Shihua1, Wang Tianyun3, Yu Haiyue4   

  1. 1. Exploration and Development Research Institute, Southwest Oil and Gas Branch of SINOPEC, Chengdu, Sichuan 610041, China;
    2. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;
    3. Xinxing Geophysical Prospecting Department, Southwest Geophysical Exploration Company of Bureau of Geophysics Prospecting Inc., PetroChina, Zhuozhou, Hebei 072751, China;
    4. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2018-03-20 Revised:2018-11-30 Online:2019-04-28 Published:2019-01-23

摘要: 前陆盆地山前带近源体系是近几年沉积学领域的研究热点与难点。侏罗系沉积期,川西地区龙门山前带发育了一套近源粗粒沉积体系。笔者充分利用全区覆盖的三维连片地震数据、测录井、岩心及野外露头资料,分析了不同时期物源特征和沉积体系演化过程。研究结果表明:①侏罗系沉积期,龙门山前带共发育来自短轴和近长轴2个方向的5套物源体系;②下侏罗统主要发育冲积扇-曲流河三角洲-滨浅湖-半深湖沉积体系,中、上侏罗统主要发育冲积扇-辫状河三角洲-滨浅湖沉积体系;③龙门山前带可以划分3种沉积模式,分别为早侏罗世、中侏罗世和晚侏罗世沉积模式。通过研究,不仅能够为龙门山前带侏罗系致密砂岩气藏的勘探提供理论依据和数据支撑,而且可以完善对近源冲积体系粗粒储层的认识。

关键词: 粗粒沉积, 物源分析, 沉积演化, 山前带, 川西地区

Abstract: Proximal sedimentary system in foothill belt of foreland basin has become a hot and hard topic in sedimentology in recent years.During the Jurassic depositional period,a set of proximalcoarse-grained sedimentary systemwas developed in the foothill belt of Longmen Mountain in the western Sichuan Basin.We analyzed the provenance features and sedimentary system evolution in different periods using an integrated dataset of seismic,well logging,core and outcrop data.The results show that:(1) during the Jurassic,there were 5 provenances in the minor axis and near-major axis directions in the foothill belt of Longmen Mountain; (2) in the Early Jurassic,alluvial fan-meandering river delta-shore-shallow lake-semi-deep lake system dominated this area,while in the Middle and Late Jurassic,alluvial fan-braided river delta-shore-shallow lake system were developed well here; (3) three types of sedimentary models can be identified in the foothill belt of Longmen Mountain,namely the Early,Middle,and Late Jurassic sedimentary models.This study canprovide theoretical guidance and data support for the exploration of the tight sand gas reservoirs in the foothill belt of Longmen Mountain,and deepen our understanding of the proximal coarse-grained alluvial reservoirs.

Key words: coarse-grained deposit, provenance analysis, sedimentary evolution, foothill belt, western Sichuan Basin

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