天然气地球化学

柴达木盆地西部小梁山凹陷烃源岩评价

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  • 1.兰州大学资源环境学院,甘肃 兰州 730000; 2.中国石油青海油田分公司研究院,甘肃 敦煌 736202;3.中国科学院地质与地球物理研究所气体地球化学重点实验室,甘肃 兰州 730000

收稿日期: 2009-02-12

  修回日期: 2009-04-27

  网络出版日期: 2009-06-10

Evaluation of Hydrocarbon Source Rocks in Xiaoliangshan Sag, Western Qaidam Basin

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  • 1. Environemnt and Resources School, Lanzhou University, Lanzhou 730000, China;2. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company,Dunhuang 736202, China; 3. Key Laboratory of Gas Geochemistry, Institute of Geology and  Geophysics, Chinese Academy of Sciences, Lanzhou  730000, China

Received date: 2009-02-12

  Revised date: 2009-04-27

  Online published: 2009-06-10

摘要

柴达木盆地西部地区第三系为柴达木盆地近年来主要产油区,其中在南翼山地区深浅层均发现含油气层系,单层产量较高。油源对比表明南翼山油田油气来源于小梁山凹陷,近年来,南翼山地区中浅层石油年产量增长较快,已成为新的接替领域。对该区的烃源岩研究表明:小梁山凹陷烃源岩以暗色灰质泥岩、泥灰岩为主,夹少量碳酸盐岩,烃源岩主要分布在下干柴沟组上段(E23)、上干柴沟组(N1)、下油砂山组(N12)、上油砂山组(N22)中,有机碳含量相对较低,但氯仿沥青“A”和总烃含量较高,均在100×10-6以上,最高达到1 000×10-6以上,属于好烃源岩;有机质类型主要以Ⅱ型为主,热演化程度从未成熟—成熟阶段均有分布。研究表明,上干柴沟组(N1)、下油砂山组(N12)烃源岩有机质丰度高,生烃潜力大,是该区的主要供油源岩。

本文引用格式

江小青, 吕宗伦, 孙柏年, 刘春艳, 方琳浩 . 柴达木盆地西部小梁山凹陷烃源岩评价[J]. 天然气地球科学, 2009 , 20(3) : 405 -410 . DOI: 10.11764/j.issn.1672-1926.2009.03.405

Abstract

The Tertiary System of Western Qaidam Basin has become the major yield area in recent years, where the hydrocarbon\|bearing stratigraphy is discovered in the Nanyi Mountain area with the higher production. According to the oil\|source correlation, the source derives from the Xiaoliang Mountain Sag in the Nanyi Mountain oilfield. The study on hydrocarbon source rocks indicates that the hydrocarbon source rocks of Xiaoliang Mountain Sag is mainly dark lime mudstone and mud limestone with a little of carbonates; the source rocks are primarily distributed in Lower Ganchiagou Formation (E23), Upper Ganchaigou Formation(N1), Lower Youshashan Formaiton(N12) and Upper Youshashan Formation(N22) characterized by low quantity of organic carbon, high quantity of chloroform bitumen A, and total hydrocarbon at the average of 100×10-6above (peak value is more than 1 000×10-6); the organic matter is domiantly type Ⅱ ranging from the immature to mature stages. The hydrocarbon source rocks in Upper Ganchaigou Formation (N1) and Lower Youshashan Formation (N12) have high abundance of organic matter and have the great potential to generate hydrocarbons.

参考文献

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