天然气地球化学

鄂尔多斯盆地西部奥陶系古油藏油源对比与靖边气田气源

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  • 1.中国石油大学(北京)地球科学学院,北京 102249;
    2.中国石油勘探开发研究院廊坊分院,河北 廊坊 065007;
    3.中国地质大学,北京 100083
张春林(1979-),男,天津武清人,博士后,主要从事石油与天然气地质综合研究. E-mail:mike_zcl@163.com.

收稿日期: 2013-08-14

  修回日期: 2013-11-18

  网络出版日期: 2014-08-10

基金资助

国家科技重大专项“大型油气田及煤层气开发”(编号:2011ZX05007);中国石油天然气股份有限公司科技攻关项目(编号:2011B-0602)联合资助.
 

Oil-Source Correlation of Paleo-reservoir in Ordovician and the Gas Source of Jingbian Gasfield,West Ordos Basin

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  • 1.College of Geoscience,China University of Petroleum (Beijing),Beijing 102249,China;
    2.Langfang Branch of PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065007,China;
    3.School of Resources,China University of Geosciences,Beijing 100083,China

Received date: 2013-08-14

  Revised date: 2013-11-18

  Online published: 2014-08-10

摘要

岩心观察和镜下薄片鉴定表明,鄂尔多斯盆地奥陶系孔洞缝储集体中普遍存在沥青,平面上主要分布在盆地中西部地区,剖面上主要集中在桌子山组顶—克里摩里组和乌拉力克组。成层富集的沥青揭示出研究区存在3类古油藏:克里摩里组顶部孔洞型、桌子山组顶部孔隙型和乌拉力克组裂隙型。应用生物标志化合物进行油源对比,证实古油藏的油源为盆地西南缘的平凉组海相泥页岩;结合天然气碳同位素、黄金管热模拟实验、构造沉积演化史、成藏史及地质背景研究,认为中央古隆起东西两侧奥陶系储层中天然气的气源岩为平凉组海相泥页岩;侏罗纪—早白垩世,平凉组泥页岩生成的油气向中央古隆起区带运聚形成古油藏;晚侏罗世—古近纪,古油藏裂解生成的天然气向盆地北东方向的构造高部位进行区域性运移,形成群体性潜山风化壳大气田——靖边气田。
 

本文引用格式

张春林,庞雄奇,田世澄,张福东,刘锐娥 . 鄂尔多斯盆地西部奥陶系古油藏油源对比与靖边气田气源[J]. 天然气地球科学, 2014 , 25(8) : 1242 -1251 . DOI: 10.11764/j.issn.1672-1926.2014.08.1242

Abstract

Core observation and slice analysis indicate that bitumen is generally distributed in the porous-cave-fractured reservoir of Ordovician and distributed planely in the middle-west of Ordos Basin and concentrated on Zhuozishan top-Kelimoli and Wulalike on the section.In the study area,the layered enrichment of bitumen shows that it has three types of paleo-reservoirs,such as Kelimoli formation pore,Zhuozishan pore and Wulalike fracture (?).It is confirmed that the marine mud shale of Pingliang Formation is oil sources of paleo-reservoir by the oil-source correlation of biomarker.Based on the natural gas carbon isotopic analysis,gold-tube pyrolysis,tectono-depositional history,hydrocarbon accumulation history and geological background,the marine mud shale of Pingliang Formation is the source rocks of natural gas in the reservoir of Ordovician,both sides of central paleouplift.The hydrocarbon generated by the mud shale of Pingliang Formation migrated and accumulated in the central paleouplift in the period of Jurassic-Early Cretaceous.The paleo-reservoir was formed.The oil-cracking gas of paleo-reservoir territorially migrated to the higher portions of structure in north-east direction of Ordos Basin in the period of Late Jurassic-Paleogene.Jingbian Gasfield was finally formed in the buried hill weathering crast.

 

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