石油学报 ›› 2020, Vol. 41 ›› Issue (12): 1610-1622.DOI: 10.7623/syxb202012013

• 地质勘探 • 上一篇    下一篇

川东南丁山地区燕山期—喜马拉雅期差异构造-热演化与页岩气保存

邱楠生1,2, 冯乾乾1,2, 腾格尔3, 申宝剑3, 马中良3, 俞凌杰3, 曹爱强1,4   

  1. 1. 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;
    2. 中国石油大学(北京)地球科学学院 北京 102249;
    3. 中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所 江苏无锡 214126;
    4. 中国石油长庆油田公司第二采气厂 陕西榆林 719000
  • 收稿日期:2020-04-23 修回日期:2020-09-24 出版日期:2020-12-25 发布日期:2021-01-06
  • 通讯作者: 邱楠生,男,1968年7月生,1989年获淮南矿业学院煤田地质专业学士学位,1994年获中国科学院地质研究所构造地质学专业博士学位,现为中国石油大学(北京)地球科学学院教授,主要从事沉积盆地构造-热演化和温压演化的研究工作。Email:qiunsh@cup.edu.cn
  • 基金资助:

    国家自然科学基金项目(No.41830424、No.41690133)和国家重点研发项目(2017YFC0603102)资助。

Yanshanian-Himalayan differential tectono-thermal evolution and shale gas preservation in Dingshan area,southeastern Sichuan Basin

Qiu Nansheng1,2, Feng Qianqian1,2, Borjigin Tenger3, Shen Baojian3, Ma Zhongliang3, Yu Lingjie3, Cao Aiqiang1,4   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. College of Geosciences, China University of Petroleum, Beijing 102249, China;
    3. Wuxi Institute of Petroleum Geology, Sinopec Petroleum Exploration and Production Research Institute, Jiangsu Wuxi 214126, China;
    4. The 2nd Gas Production Plant, PetroChina Changqing Oilfield Company, Shaanxi Yulin 719000, China
  • Received:2020-04-23 Revised:2020-09-24 Online:2020-12-25 Published:2021-01-06

摘要:

中国的海相富有机质页岩经历了多期构造改造,其含气性具有明显的差异。页岩气在不同构造演化阶段的保存条件是揭示页岩气差异富集机理的关键科学问题之一,开展构造-热演化研究可以明确其热演化史和构造隆升-剥蚀过程,为其评价提供演化格架。研究以丁山地区下古生界页岩为对象,联合磷灰石裂变径迹、磷灰石(U-Th)/He和锆石(U-Th)/He等多个古温标反演热演化史,结合镜质体反射率重建的最高古地温剖面,对丁山地区燕山期以来的差异构造隆升过程和剥蚀量进行了恢复,并在此基础上结合流体包裹体分析对丁山地区龙马溪组页岩的压力演化过程进行了模拟;根据页岩在埋藏—抬升过程中的温、压演化特征,定量表征了不同抬升阶段页岩含气量的变化,建立了龙马溪组页岩"埋藏—生烃—抬升"的演化格架。分析表明,丁山地区在燕山期和喜马拉雅期经历了不同的构造隆升过程。燕山期表现为"早期快速隆升—晚期缓慢隆升"的分段隆升,具有自NW向SE递进隆升且隆升幅度逐渐增大的特征;喜马拉雅期表现为整体快速隆升。燕山期是丁山地区产生差异构造隆升的主要时期。受这种差异构造隆升-剥蚀作用的影响,龙马溪组页岩的降温、降压过程和页岩气的散失过程具有明显的差异。燕山期的差异构造隆升是造成丁山地区龙马溪组页岩含气性呈平面分带的主要原因。

关键词: 构造-热演化, 页岩气保存, 龙马溪组页岩, 剥蚀量, 丁山地区

Abstract:

China's marine organic-rich shale has undergone multiple periods of tectonic reworking, and its gas-bearing properties have obvious differences. The preservation condition of shale gas in different stages of tectonic evolution is one of the key scientific issues to reveal the differential enrichment mechanism of shale gas. The studies on tectono-thermal evolution can clarify its thermal evolution history and tectonic uplift-denudation process, providing an evolutionary framework for its evaluation. Using the geothermometers such as apatite fission track, apatite (U-Th)/He and zircon (U-Th)/He, this study conducts the thermal evolution history inversion of the Lower Paleozoic shale in Dingshan area. In combination with the highest geothermal profile reconstructed by vitrinite reflectivity, it restores the differential tectonic uplift process and denudation thickness since the Yanshanian in Dingshan area. In combination with fluid inclusion analysis, it simulates the pressure evolution of the Longmaxi Formation shale in Dingshan area. According to the evolution characteristics of temperature and pressure of the shale in the process of burial-uplift, this paper quantitatively characterizes the variation of shale gas content in different uplifting stages, and establishes the evolutionary framework for "burial-hydrocarbon generation-uplift" of the Longmaxi Formation shale. The analysis shows that Dingshan area underwent different tectonic uplift processes during Yanshanian and Himalayan periods. The uplift process showed periodicity characterized by "rapid uplift in early stage but slow uplift in late stage" with progressive uplift from NW to SE and gradually increasing magnitude of exhumation during Yanshanian period, but overall rapid uplift during Himalayan period. The Yanshanian period is the main period of differential tectonic uplift in Dingshan area. Under the influence of the differential tectonic uplift and denudation, the cooling and pressure reduction process and the shale gas loss process in the Longmaxi Formation shale are significantly different. The differential tectonic uplift in Yanshanian period is the main reason for the gas-bearing zonation of the Longmaxi Formation shale in Dingshan area.

Key words: tectono-thermal evolution, shale gas preservation, Longmaxi Formation shale, denudation amount, Dingshan area

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