岩性油气藏 ›› 2023, Vol. 35 ›› Issue (3): 51–65.doi: 10.12108/yxyqc.20230305

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地平凉北地区三叠系长7段烃源岩地球化学特征及形成环境

薛楠1,2, 邵晓州1,2, 朱光有3, 张文选4, 齐亚林1,2, 张晓磊1,2, 欧阳思琪5, 王淑敏1,2   

  1. 1. 低渗透油气田勘探开发国家工程实验室, 西安 710018;
    2. 中国石油长庆油田公司 勘探开发研究院, 西安 710018;
    3. 中国石油勘探开发研究院, 北京 100083;
    4. 中国石油长庆油田公司 勘探事业部, 西安 710018;
    5. 中国石油大学 (北京)地球科学学院, 北京 102249
  • 收稿日期:2022-07-10 修回日期:2022-08-20 发布日期:2023-04-25
  • 通讯作者: 邵晓州(1985-),男,硕士,高级工程师,主要从事石油勘探方面的研究工作。Email:shxzh1@163.com。 E-mail:shxzh1@163.com
  • 作者简介:薛楠（1995—），男，硕士，助理工程师，主要从事油气地质与成藏等方面的研究工作。地址：（710018）陕西省西安市未央区凤城四路兴隆园小区。Email：18409185904@163.com。
  • 基金资助:
    国家科技重大专项 “鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（编号： 2016ZX05050） 和国家科技重大专项 “大型油气田及煤层气开发”（编号： 2017ZX05001002） 联合资助。

Geochemical characteristics and formation environment of source rocks of Triassic Chang 7 member in northern Pingliang area，Ordos Basin

XUE Nan1,2, SHAO Xiaozhou1,2, ZHU Guangyou3, ZHANG Wenxuan4, QI Yalin1,2, ZHANG Xiaolei1,2, OUYANG Siqi5, WANG Shumin1,2   

  1. 1. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    4. Department of Exploration, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    5. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2022-07-10 Revised:2022-08-20 Published:2023-04-25

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摘要： 通过对鄂尔多斯盆地西南缘平凉北地区三叠系长7段15口井的暗色泥岩样品进行地球化学分析,结合测井解释成果,推断出其古沉积环境,总结了烃源岩质量的主控因素及发育模式。研究结果表明:①平凉北地区三叠系长7段烃源岩有机质丰度自下而上逐渐减小,长73亚段有机质丰度最大,长72亚段次之,长71亚段最小。长73亚段烃源岩有机碳质量分数最高可达12.4%,生烃潜力大,有机质类型以Ⅰ型和Ⅱ1型为主,是一套处于成熟阶段的好-优质湖相烃源岩。②平凉北地区长73亚段沉积期气候潮湿温暖,为陆相淡水环境。较高的古生产力、缺氧还原水体为有机质的生长、繁殖和保存创造了有利条件。③平凉北地区长73亚段发育火山-热液型烃源岩。火山活动与热水沉积共同影响着长73亚段的水体环境,其较高的古生产力是有机质大量生成的基础,缺氧还原环境是有机质完整保存的关键因素。

关键词: 地球化学, 古生产力, 潮湿温暖气候, 缺氧还原环境, 火山-热液型烃源岩, 长7段, 三叠系, 平凉北地区, 鄂尔多斯盆地

Abstract: Through geochemical analysis of dark mudstone samples of Triassic Chang 7 member from 15 wells in northern Pingliang area，southwest margin of Ordos Basin，combined with logging interpretation results，the paleosedimentary environment was inferred，and the main controlling factors and development model of hydrocarbon source rocks were summarized. The results show that： （1）The organic matter abundance of Triassic Chang 7 source rocks in northern Pingliang area gradually decreased from bottom to top， with the highest organic matter abundance in Chang 73 sub-member，followed by Chang 72 sub-member， and the lowest in Chang 71 submember. The organic carbon mass fraction of the hydrocarbon source rock of Chang 73 sub-member is up to 12.4%， with great hydrocarbon generation potential. The organic matters are mainly typeⅠand type Ⅱ1. It is a set of good to high-quality lacustrine source rocks in mature stage.（2）The climate was moist and warm during the sedimentary period of Chang 73 sub-member in northern Pingliang area， and it was a terrestrial freshwater environment. High paleo-productivity and anoxic reduction water created favorable conditions for the growth， reproduction and preservation of organic matters.（3）Volcanic-hydrothermal source rocks are developed in Chang 73 submember in northern Pingliang area. Volcanic activity and hydrothermal deposition jointly affect the water environment of Chang 73 sub-member. The high paleo-productivity is the basis for the formation of large amounts of organic matters， and the anoxic reduction environment is the key factor for the complete preservation of organic matters.

Key words: geochemistry, paleo-productivity, moist and warm, anoxic reduction environment, volcanic-hydrothermal source rocks, Chang 7 member, Triassic, northern Pingliang area, Ordos Basin

中图分类号: 

  • TE121.3
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