天然气地球科学

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南华北盆地豫西地区C—P烃源岩地球化学特征

吴伟,王雨涵,曹高社,黄雪峰,刘惟庆   

  1. 河南理工大学,河南 焦作 454000
  • 收稿日期:2014-03-01 修回日期:2014-07-23 出版日期:2015-01-10 发布日期:2015-01-10
  • 作者简介:吴伟(1979-),男,河南温县人,副教授,博士,主要从事沉积盆地分析与油气勘探研究. E-mail:wei@hpu.edu.cn.
  • 基金资助:

    国家自然科学基金(编号:41102059);油气资源与探测国家重点实验室(编号:PRP/open-1109);河南省教育厅自然科学基金(编号:12B170005)联合资助.

The Geochemical Characteristics of The Carboniferous and Permian Source Rocks in the Western Henan,the southern North China Basin

WU Wei,WANG Yu-han,CAO Gao-she,HUANG Xue-feng,LIU Wei-qing   

  1. Henan Polytechnic University,Jiaozuo 454000,China
  • Received:2014-03-01 Revised:2014-07-23 Online:2015-01-10 Published:2015-01-10

摘要:

针对南华北盆地上古生界油气勘探难题,在油气地质理论的指导下,进行大量踏勘和岩心观察,利用实验室烃源岩有机显微组分鉴定、残余TOC测定、热解分析和镜质组反射率测定等方法,对豫西地区C—P烃源岩进行了有机地球化学特征分析,以期解决豫西地区煤系地层厚度大但尚无油气藏发现的问题。研究发现:烃源岩类型包括炭质泥岩、生物碎屑灰岩、煤岩和暗色泥岩等烃源岩,分别受控于该区的沉积环境演化,地层从下向上表现为1个规模较大的海进—海退旋回,太原组沉积中期为最大海侵时期,对应的烃源岩应为原始条件下最好的烃源岩|烃源岩有机质类型主要以Ⅲ型干酪根为主,生烃潜量极低,远低于良好烃源岩标准,依据残余有机指标评价为差烃源岩或非烃源岩|烃源岩生烃潜量低且倒挂的现象主要由过高热演化程度、大量断裂发育以及不同岩性的CH4吸附能力差异导致。对于整个豫西地区油气勘探而言,保存条件极好或者受区域热事件影响较低的地区可能为潜在的有利区。

关键词: 热演化程度, 烃源岩评价, 豫西地区, 南华北盆地

Abstract:

The purpose of the paper is to solve the problem about the hydrocarbon source rock recognition of Western Henan,the southern North China basin.Based on an extensive survey and observation of drilling cores,organic maceral identification,determination of residual  TOC,thermal analysis and vitrinite reflectance determination of hydrocarbon source rocks were used in the analysis of organic geochemistry feature of the Carboniferous and Permian source rocks in Western Henan.The study found that source rock,including carbonaceous mudstone,bioclastic limestone,coal,and dark mudstone,were influenced by the evolution of sedimentary environment.The best hydrocarbon source rocks originally should be the bioclastic limestone of Taiyuan Formation which deposited in the maximum transgression of the huge Transgressive-regressive cycles.However,the source rocks with type Ⅲ organic matter  and low hydrocarbon generation potential,mainly should be evaluated as poor source rocks or non-hydrocarbon source rock.The inversion phenomenon of low hydrocarbon generation potential was due to high thermal evolution,large amount of fracture development and the difference of CH4 adsorption capacity of different lithology.In Western Henan,the area where has excellent preservation conditions and affected by the regional thermal event slightly should be the favorable exploration area.

Key words: The degree of thermal evolution, Evaluation of hydrocarbon source rocks, Western Henan, The southern North China Basin

中图分类号: 

  • TE122.1+13
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