羌塘盆地晚三叠世古地理反转及其对烃源岩的控制作用

付修根; 陈明浩; 王剑; 韦恒叶; 曾胜强; 王忠伟; 沈利军; 周刚

doi:10.12029/gc20230307001

羌塘盆地晚三叠世古地理反转及其对烃源岩的控制作用

1. 西南石油大学油气藏地质及开发国家重点实验室, 西南石油大学地球科学与技术学院, 西南石油大学羌塘盆地研究院, 四川成都 610050;
2. 中国地质调查局成都地质调查中心, 四川成都 610081;
3. 中国石油西南油气田公司, 四川成都 610051

基金项目:

国家自然科学基金项目(No.42241203、91955204)、四川省青年科技创新研究团队项目(No.2021JDTD0020)和中国石油—西南石油大学创新联合体项目(No.2020CX0101)资助。

详细信息

作者简介:
付修根,男,1976年生,研究员,从事沉积地质及石油地质工作；E-mail:fuxiugen@126.com。

通讯作者:
王剑,男,1962年生,研究员,从事沉积地质与石油地质工作

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出版历程
- 网络出版日期: 2024-02-03

Late Triassic paleogeographic inversion and its control on source rocks in the Qiangtang Basin， Xizang (Tibet)

1. State Key Laboratory of Oil and Gas Reservior Geology and Exploitation, Southwest Petroleum University;School of Geoscience and Technology, Southwest Petroleum University and Qiangtang Institute of Sedimentary Basin, Southwest Petroleum University, Chengdu, Sichuan, 610050;
2. Chengdu Center, China Geological Survey, Chengdu, Sichuan, 610081;
3. PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan, 610051

Funds:

Supported by National Natural Science Foundation of China (No. 42241203、 91955204)、 Sichuan Youth Science and Technology Innovation Research Team Project (No. 2021JDTD0020) and CNPC-SWPU Innovation Alliance (No. 2020CX0101)

摘要

摘要: 【研究目的】差异构造演化对羌塘盆地晚三叠世-早侏罗世烃源岩发育特征及空间展布的影响及意义。【研究方法】本文从沉积演化的角度，讨论了羌塘盆地晚三叠世构造转换的沉积记录。【研究结果】研究表明，晚三叠世，羌塘盆地发生了明显的沉积转换，表现为中三叠世-晚三叠世的海退序列转换为早侏罗世的海侵序列。与此同时，该时期羌塘盆地也发生了重要的古地理反转，表现为北羌塘由中三叠世的海相沉积逐渐转化为晚三叠世的陆相沉积，而南羌塘则由中三叠世的陆相沉积转化为晚三叠世的海相沉积。【结论】羌塘盆地晚三叠世的沉积转换和古地理反转控制了烃源岩的分布，晚三叠烃源岩主要受前陆盆地控制，发育于北羌塘的深水区，盆地周缘则发育含煤系烃源岩。早侏罗世烃源岩主要受被动大陆边缘盆地控制，发育于南羌塘的深水区，在南羌塘北部的潟湖环境发育含油页岩烃源岩。
- 烃源岩 /
- 沉积转换 /
- 古地理反转 /
- 石油地质调查工程 /
- 羌塘盆地 /
- 西藏
Abstract: This paper is the result of petroleum geological survey engineering. [Objective] Effect and significance of various tectonic history on the development characteristics and spatial distribution of source rocks in the Qiangtang Basin during the Triassic-Jurassic. [Methods] In the present study, we discuss the sedimentary records of the Late Triassic tectonic inversion. [Results] The Middle Triassic sequence has typically shallowing-upward changes and a marine regression related regional uplift. However, the Early Jurassic sequence displays typically deeping-upward changes due to the tectonic subsidence and transgression. We also identify paleogeographic inversion during the Late Triassic in the Qiangtang Basin. In the northern Qiangtang depression, the pre-existing (Middle-early Late Triassic) marine depositional areas turned into terrestrial units during the Norian. In contrast, the previously (Middle Triassic) terrestrial part of the sourthern Qiangtang depression became marine units. [Conclusions] Our study suggests that the distribution of source rocks in the Qiangtang Basin was mainly controlled by the sedimentary change and paleogeographic inversion during the Late Triassic. The Late Triassic source rocks were probably related to the foreland basin and developed in the deep water area of the northern Qiangtang depression, while the coal-bearing source rocks were developed around the basin. The Early Jurassic source rocks are probably related to the passive continental margin basin and developed in the deep-water area of southern Qiangtang depression. Oil shale-bearing source rocks are well developed in the lagoon in the northern part of Southern Qiangtang depression.
- source rocks /
- sedimentary change /
- paleogeographic inversion /
- petroleum geological survey engineering， Qiangtang Basin， Xizang (Tibet) /
- undefined /
- undefined