石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (3): 684-695.doi: 10.11743/ogg20240308

• 油气地质 • 上一篇    下一篇

鄂西渝东地区中-新生代构造变形及其对油气保存的制约

易积正1(), 包汉勇1,2, 李以严1,2(), 张道洪1,2, 秦军1,2, 谢洪光1,2   

  1. 1.中国石化 江汉油田分公司,湖北 潜江 433100
    2.中国石化 江汉油田分公司 勘探开发研究院,湖北 武汉 430070
  • 收稿日期:2024-02-27 修回日期:2024-05-16 出版日期:2024-07-01 发布日期:2024-07-01
  • 通讯作者: 李以严 E-mail:498703979@qq.com;liyiy.jhyt@sinopec.com
  • 第一作者简介:易积正(1962—),男,博士、教授级高级工程师,常规-非常规油气地质学理论研究、油气勘探与开发。E-mail:498703979@qq.com
  • 基金项目:
    中国石化科技项目(P24050)

Meso-Cenozoic structural deformations and their impacts on hydrocarbon preservation in the western Hubei-eastern Chongqing area

Jizheng YI1(), Hanyong BAO1,2, Yiyan LI1,2(), Daohong ZHANG1,2, Jun QIN1,2, Hongguang XIE1,2   

  1. 1.Jianghan Oilfield Company,SINOPEC,Qianjiang,Hubei 433100,China
    2.Research Institute of Petroleum Exploration and Development,Jianghan Oilfield Company,SINOPEC,Wuhan,Hubei 430070,China
  • Received:2024-02-27 Revised:2024-05-16 Online:2024-07-01 Published:2024-07-01
  • Contact: Yiyan LI E-mail:498703979@qq.com;liyiy.jhyt@sinopec.com

摘要:

油气成藏跟构造息息相关,研究构造及油气保存条件在油气勘探中具有重要作用。研究了鄂西渝东地区断裂发育特征及构造样式的差异分布,划分了构造单元,描述了断裂、构造类型及演化,分析了构造对保存条件的影响。研究表明:鄂西渝东中扬子地块南部构造带西部中生代以来经历了多期盆-山耦合构造作用,构造变形强度大,发育基底卷入型和盖层滑脱型断层。提出了该复杂构造区油气保存条件评价的方法。评价认为齐岳山断层以西保存条件好于东侧,以万县复向斜的保存条件最好,其次为石柱复向斜。湘鄂西褶皱带以利川构造带保存条件最好,其次为恩施构造带,南北镇-桑植石门构造带最差。该研究成果在红星地区、宜恩地区页岩气、致密气、岩溶体油气勘探中的应用取得了较好的效果。

关键词: 保存条件, 构造样式, 复杂构造, 中-新生代, 红星地区, 鄂西渝东

Abstract:

Since hydrocarbon accumulation is closely associated with structures, examining structures and hydrocarbon preservation conditions is significant for hydrocarbon exploration. In this study, we explore the fault characteristics and the differential distribution of structural styles in the western Hubei - eastern Chongqing area and classify the structural units in this area. Furthermore, we describe the types and evolution of faults and other geological structures in this area and analyze their impacts on hydrocarbon preservation. The results reveal that the western portion of the southern structural zone of the middle Yangtze Block in this area has undergone multi-stage basin-orogen couplings since the Mesozoic. This has led to a high intensity of structural deformations and the formation of basement-involved faults and cap rock-detachment faults. A method to assess the hydrocarbon preservation conditions in this structurally complex area is proposed in this study. The assessment results suggest that areas west of the Qiyueshan fault are more favorable compared with those east of it in hydrocarbon preservation. Among others, the Wanxian synclinorium displays the optimal preservation conditions, followed by the Shizhu synclinorium. In the western Hunan-Hubei fold belt, the Lichuan structural belt demonstrates the most favorable conditions for hydrocarbon preservation, succeeded by the Enshi structural belt, with the Nanbei Town-Sangzhi Shimen structural belt exhibiting the least favorable conditions. The findings of this study have proven effective in exploring shale gas, tight gas, and karst reservoirs in the Hongxing and Yi’en areas.

Key words: preservation condition, structural style, complex structure, Meso-Cenozoic, Hongxing area, western Hubei- eastern Chongqing area

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