油气地质

龙门山前陆盆地南段须家河组页岩有机地球化学特征

  • 胡宝群 ,
  • 孙占学 ,
  • 李满根 ,
  • 白丽红
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  • 1.油气藏地质及开发工程国家重点实验室(成都理工大学),成都 610059; 2.中国地质调查局成都中心,成都 610081; 3.中国石油大港油田分公司勘探开发研究院,天津 300280)
周启伟(1992-),男,成都理工大学在读硕士研究生,研究方向为沉积与储层地质学。 地址:(610059)四川省成都市成华区二仙桥东三路 1 号成都理工大学油气藏地质及开发工程国家重点实验室。 E-mail:553539676@qq.com。

收稿日期: 2016-07-13

  修回日期: 2016-08-21

  网络出版日期: 2016-11-10

基金资助

国土资源部地质调查项目“龙门山前缘油气勘探新领域研究”(编号:12120115004501-01)和国家自然科学基金项目“龙门山冲断带(中段)异地系统晚三叠世地层标定与原型盆地恢复”(编号:41372114)联合资助

Organic geochemical characteristics of shale of Xujiahe Formation in the southern Longmen Mountain foreland basin

  • HU Baoqun ,
  • SUN Zhanxue ,
  • LI Mangen ,
  • BAI Lihong
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology,Chengdu 610059, China; 2. Chengdu Center of Geological Survey, China Geological Survey, Chengdu 610081, China;3. Research Institute of Exploration and Development, PetroChina Dagang Oilfield Company, Tianjin 300280, China

Received date: 2016-07-13

  Revised date: 2016-08-21

  Online published: 2016-11-10

摘要

龙门山前陆盆地南段上三叠统须家河组页岩地层较发育,勘探程度低且具备页岩气成藏的可能性。基于野外剖面实测及定点采样、岩石热解实验、有机碳测定、镜质体反射率测试与分析等方法,结合岩心资料,综合分析页岩有机地球化学特征。 结果表明:区内须家河组页岩有机碳质量分数主要为 1.0%~2.0%,总体上达到一般—较好的生气标准;干酪根类型以Ⅲ型为主,Ⅱ2 型次之;有机质成熟度主要为 0.8%~1.7%,部分高于 2.0%,整体处于成熟—高成熟演化阶段。 通过系统对比区内须家河组各段页岩有机地球化学特征与孔隙度、埋藏深度、有效厚度等地质参数,评价出区内须五段与须三段均为页岩气勘探与开发的有利层段。

本文引用格式

胡宝群 , 孙占学 , 李满根 , 白丽红 . 龙门山前陆盆地南段须家河组页岩有机地球化学特征[J]. 岩性油气藏, 2016 , 28(6) : 45 -51 . DOI: 10.3969/j.issn.1673-8926.2016.06.007

Abstract

With the possibility of shale gas accumulation, the shale of the Upper Triassic Xujiahe Formation is well developed in the southern Longmen Mountain for-land basin, but the degree of prospecting is low. Based on the field profile mea-surement and fixed-point sampling, rock pyrolysis experiment, TOC determination, the test of vitrinite reflectance (Ro) and core data, the organic geochemical characteristics of shale was analyzed. The results show that the TOC content of shale ranges from 1% to 2%, reaching fair-good according to gas generation standards. Kerogen is mainly Ⅲ type, secondly Ⅱ2 type. Being from 0.8% to 1.7% generally, some above 2.0%, the maturity of organic matter is at the mature to high mature stage of evolution. Through the analysis of the organic geochemical characteristics and geologic parameters (porosity, burial depth and effetive thickness) of the shale of Xujiahe Formation, it is considered that the fifth member and third member of Xujiahe Formation are favorable for shale gas exploration in the southern Longmen Mountain foreland basin.
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