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川东高陡构造带震旦系灯影组丘滩相气藏预测

  • 周刚 ,
  • 文龙 ,
  • 王文之 ,
  • 张本健 ,
  • 严威 ,
  • 魏朋辉 ,
  • 蒋航 ,
  • 和源 ,
  • 汪华 ,
  • 卞艳红 ,
  • 曾云贤 ,
  • 杨岱林
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  • 1.中国石油西南油气田公司勘探开发研究院;
    2.中国石油西南油气田公司;
    3.北京源烃泰克科技有限公司
周刚,1984年生,高级工程师,博士,主要从事油气地质综合研究工作。地址:(610041)四川省成都市高新区天府大道12号。E-mail:zhougang29@petrochina.com.cn

修回日期: 2023-08-11

  网络出版日期: 2023-09-21

Prediction for mound-beach gas reservoirs of Sinian Dengying Formation in high-steep structural belt, eastern Sichuan Basin

  • ZHOU Gang ,
  • WEN Long ,
  • WANG Wenzhi ,
  • ZHANG Benjian ,
  • YAN Wei ,
  • WEI Penghui ,
  • JIANG Hang ,
  • HE Yuan ,
  • WANG Hua ,
  • BIAN Yanhong ,
  • ZENG Yunxian ,
  • YANG Dailin
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  • 1. Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China;
    2. PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051, China;
    3. Geoscience Solutions Company, Beijing, 100102, China

Revised date: 2023-08-11

  Online published: 2023-09-21

摘要

在川东高陡构造带内,构造复杂、地震资料差,寻找震旦系灯影组油气富集带具有重大挑战。为此,运用构造形迹分析构造期次,环状构造结合地震相特征预测藻丘滩;丘滩相特征结合构造形迹期次分析WT1井失利原因;综合丘滩相与构造的叠合关系以预测开江地区灯影组油气富集带。结果表明:①开江地区的NE构造主体为川东高陡构造带在燕山中晚期挤压形成,喜山期强烈改造定型。②EW向低幅度构造为大巴山于晚燕山期弱挤压形成。③SN向构造形成于喜马拉雅晚期,动力来自龙门山南段挤压。④燕山中晚期的NE构造与裂解气富集晚期匹配。发育大量的环状构造,为藻丘滩刚性地质体形成,为古岩性圈闭,与原油成藏期匹配。⑤环状构造+NE向构造是油气富集带。综合构造形迹与地震相预测了多个油气目标:七里南背斜内的七3环是最有利目标,藻丘滩地震相最为明显,且叠加NE向构造;铁1环是现实的目标;里1环是潜在的目标区。环状构造在开江地区大量存在,具有较好的油气勘探远景。

本文引用格式

周刚 , 文龙 , 王文之 , 张本健 , 严威 , 魏朋辉 , 蒋航 , 和源 , 汪华 , 卞艳红 , 曾云贤 , 杨岱林 . 川东高陡构造带震旦系灯影组丘滩相气藏预测[J]. 天然气勘探与开发, 2023 , 46(3) : 1 -13 . DOI: 10.12055/gaskk.issn.1673-3177.2023.03.001

Abstract

It is a great challenge to find hydrocarbon-enriched zones of the Sinian Dengying Formation in the high-steep structural belt of eastern Sichuan Basin, with the complex structures and poor seismic data. For this reason, some analyses and predictions were carried out, including: tectonic period analysis by structural features, the prediction for algal mound beach by ring structure and seismic facies characteristics, the analysis on failure of Well Wutan-1 according to the characteristics of mound-beach facies and structural features and periods, and the prediction for hydrocarbon-enriched zones of the Dengying Formation in Kaijiang area based on the superimposed relationship between mound-beach facies and structure. The results are obtained in five aspects. (i) The main NE-trending structure in Kaijiang area was formed by the compressional movement of the high-steep structural belt during the middle-late Yanshan period, and its strong transformation was finalized during the Himalayan period. (ii) The EW-trending low-amplitude structure was formed by the weak compression of Daba Mountain during the late Yanshan period. (iii) The SN-trending structure was formed during the late Himalayan period by the compression of the southern Longmen Mountain. (iv) The NE-trending structure in the middle-late Yanshan period matches the late period of pyrolysis gas enrichment. There develops a large number of ring structures, which were formed by algal-mound-beach rigid terrains. They are paleo-lithologic traps, matching the oil accumulation period. (v) The ring structure plus NE-trending structure indicates hydrocarbon-enriched zone. Several oil and gas targets were predicted by combining the structural features with seismic facies. Result shows that, the Qi-3 ring in Qilinan anticline is the most favorable target, with the most obvious algal-mound-beach seismic facies, and superimposed with the NE-trending structure; the Tie-1 ring is a realistic target; and the Li-1 ring is a potential one. The ring structures are abundant in the Kaijiang area, which have a good prospect of oil and gas.

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