柴达木盆地扎哈泉地区致密油新类型的发现及其特征

运用沉积学、储层地质学和有机地球化学等手段,对最近在柴达木盆地扎哈泉地区新发现的致密油藏进行研究。扎哈泉地区沉积相以滨浅湖的滩坝砂为主体,为致密油的形成打下了沉积学基础。本区致密油的产状特征是油层薄,与烃源岩呈薄互层产出,为近源自生自储关系,提供了非常有利于致密油形成的源储共生组合条件。致密油储层致密,具有微米级孔隙和纳米级孔隙,储层平均孔隙度为5.8%,平均渗透率为0.45mD,属于典型致密油藏。与致密油储层互层的古近系烃源岩的有机质类型以Ⅰ型和Ⅱ1型为主;Tmax在311~461oC之间,处于低熟至成熟阶段。有机碳含量主要分布在0.29%~4.42%之间,但多数低于1.0%,比现阶段致密油...

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Bibliographic Details
Published inBeijing da xue xue bao Vol. 53; no. 1; pp. 37 - 49
Main Author 周宾;关平;魏恒飞;张永庶;付玲;于川淇
Format Journal Article
LanguageChinese
Published Beijing Acta Scientiarum Naturalium Universitatis Pekinenis 2017
北京大学造山带与地壳演化教育部重点实验室，北京大学地球与空间科学学院，北京 100871%中国石油天然气股份有限公司青海油田分公司勘探开发研究院,敦煌,736202
Subjects
Basins
Exploration
Geology
Oil
Organic matter
Permeability
Porosity
扎哈泉
柴达木盆地
烃源岩
烃转化率
致密油
Qaidam Basin
source rock
tight-oil
柴达木盆地
扎哈泉
致密油
Zhahaquan
烃源岩
Qaidam Basin
烃转化率
conversion efficiency of hydrocarbon
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ISSN0479-8023
DOI10.13209/j.0479-8023.2017.008

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Summary:运用沉积学、储层地质学和有机地球化学等手段,对最近在柴达木盆地扎哈泉地区新发现的致密油藏进行研究。扎哈泉地区沉积相以滨浅湖的滩坝砂为主体,为致密油的形成打下了沉积学基础。本区致密油的产状特征是油层薄,与烃源岩呈薄互层产出,为近源自生自储关系,提供了非常有利于致密油形成的源储共生组合条件。致密油储层致密,具有微米级孔隙和纳米级孔隙,储层平均孔隙度为5.8%,平均渗透率为0.45mD,属于典型致密油藏。与致密油储层互层的古近系烃源岩的有机质类型以Ⅰ型和Ⅱ1型为主;Tmax在311~461oC之间,处于低熟至成熟阶段。有机碳含量主要分布在0.29%~4.42%之间,但多数低于1.0%,比现阶段致密油烃源岩的标准明显偏低,属于一种特殊类型。与其他盆地相比,虽然柴达木盆地扎哈泉地区致密油烃源岩有机质丰度偏低,但该地区咸化湖泊环境使其具有生烃转化率高的典型特点,因此,同样可以生成较多的液态烃类,预示柴达木盆地致密油勘探具有很大的潜力。
Bibliography:Sedimentology,reservoir geology and organic geochemistry are applied to the research of tight-oilfound in Zhahaquan area of Qaidam Basin.The sedimentary facies in Zhahaquan area are mainly beach-bar sand,which becomes a good sedimentary background for tight-oil forming.The occurrence of tight-oil in this area is thinoil layer and source rocks interbed,so the tight-oil is a self-generating and self-preserving reservoir near source.Which provides a favorable condition of reservoir and source paragenesis for tight-oil forming.The reservoir isvery tight which has pore of micron and nanometer,and has an average porosity of5.8%and an averagepermeability of0.45mD,so it is a typical tight-oil reservoir.Type of organic matter in Eocene source rocks ismainlyⅠandⅡ1.Tmax value is311?461oC,which illustrates that the source rocks are between immaturate andmaturation stages.Content of organic carbon falls0.29%?4.42%,mainly less than1.0%,which is much less thanthe source rock indicator for tight-oil.The tight-oil in the area
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ISSN:0479-8023
DOI:10.13209/j.0479-8023.2017.008