新疆石油地质 ›› 2021, Vol. 42 ›› Issue (4): 418-427.doi: 10.7657/XJPG20210404

• 油气勘探 • 上一篇    下一篇

松辽盆地青山口乡青山口组细粒沉积岩分类及其成因

丁聪1(), 孙平昌1,2(), 热西提·亚力坤1, 王畅3, 张瀛1, 张晴4   

  1. 1.吉林大学 地球科学学院,长春 130061
    2.吉林省油页岩及共生能源矿产重点实验室,长春 130061
    3.北京师范大学珠海分校 统计学院,广东 珠海 519087
    4.吉林大学 经济学院,长春 130012
  • 收稿日期:2020-11-09 修回日期:2021-04-24 出版日期:2021-08-01 发布日期:2022-09-27
  • 通讯作者: 孙平昌 E-mail:1140114133@qq.com;sunpc@jlu.edu.cn
  • 作者简介:丁聪(1997-),男,山东济宁人,硕士研究生,沉积学,(Tel)15764331685(E-mail) 1140114133@qq.com
  • 基金资助:
    国家自然科学基金(41772092);国家自然科学基金(41402088);中国地质调查局地质调查项目(CDD2106-2);中国地质调查局地质调查项目(DD20211341)

Classification and Genesis of Fine-Grained Sedimentary Rocks of Qingshankou Formation in Songliao Basin

DING Cong1(), SUN Pingchang1,2(), WANG Chang3, ZHANG Ying1, ZHANG Qing4   

  1. 1. School of Earth Sciences, Jilin University, Changchun, Jilin 130061, China
    2. Jilin Key Laboratory of Oil Shale and Coexisting Minerals, Changchun, Jilin 130061, China
    3. School of Statistics, Beijing Normal University, Zhuhai, Guangdong 519087, China
    4. School of Economics, Jilin University, Changchun, Jilin 130012, China
  • Received:2020-11-09 Revised:2021-04-24 Online:2021-08-01 Published:2022-09-27
  • Contact: SUN Pingchang E-mail:1140114133@qq.com;sunpc@jlu.edu.cn

摘要:

松辽盆地青山口组为厚层细粒沉积岩,是页岩油气成藏的重要层位,细粒沉积岩的分类是开展非常规油气勘探的前提。通过松辽盆地青山口乡剖面实测和系统样品分析,开展了青山口组细粒沉积岩类型、沉积环境和地球化学特征研究。根据总有机碳、碳酸盐矿物和陆源碎屑矿物含量,研究区细粒沉积岩可分为贫有机质陆源碎屑细粒岩、中有机质陆源碎屑细粒岩、富有机质陆源碎屑细粒岩、极贫有机质陆源碎屑细粒岩、贫有机质碳酸盐细粒岩和极贫有机质碳酸盐细粒岩。其中富有机质陆源碎屑细粒岩、中有机质陆源碎屑细粒岩和贫有机质碳酸盐细粒岩沉积于相对静水的半深湖,贫有机质陆源碎屑细粒岩、极贫有机质陆源碎屑细粒岩和极贫有机质碳酸盐细粒岩沉积于浅湖,碳酸盐岩主要沉积于温带—亚热带开放性咸水湖盆。细粒沉积岩有机质类型主要为Ⅱ1型,为中等—好烃源岩,深埋藏区中—富有机质陆源碎屑细粒岩是进行页岩油气勘探的优质对象。

关键词: 松辽盆地, 青山口乡, 青山口组, 细粒沉积岩, 岩石分类, 沉积环境, 地球化学特征

Abstract:

The Qingshankou formation in the Songliao basin belongs to thick fine-grained sedimentary rock, and it is an important interval for shale oil and gas accumulation. The classification of the fine-grained sedimentary rocks is the key premise for exploring unconventional oil and gas. Based on field survey and systematic sampling analysis, we studied the types, sedimentary environment and geochemical characteristics of the fine-grained sedimentary rock of the Qingshankou formation in the Songliao basin. According to TOC and the contents of carbonate and terrigenous clastic minerals, the fine-grained sedimentary rocks in the study area can be classified into fine-grained terrigenous clastic rocks with extremely poor, poor, moderate and rich organic matters, and fine-grained terrigenous carbonate rocks with poor and extremely poor organic matters. The fine-grained terrigenous clastic rocks with rich and moderate organic matters and the fine-grained terrigenous carbonate rocks with poor organic matter were deposited in a semi-deep lake environment with stiller water; the fine-grained terrigenous clastic rock with poor and extremely poor organic matters and the fine-grained terrigenous carbonate rock with extremely poor organic matters were deposited in a shallow lake environment; and carbonate rock was mainly deposited in an open saline lake basin in temperate to subtropical zones. The primary type of organic matters in the fine-grained sedimentary rocks is Type Ⅱ1. The fine-grained sedimentary rocks are medium-good quality source rocks. The fine-grained terrigenous clastic rocks with rich and poor organic matters in deep formations are primary targets for shale oil and gas exploration.

Key words: Songliao basin, Qingshankou township, Qingshankou formation, fine-grained sedimentary rock, rock classification, sedimentary environment, geochemical characteristic

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