| 鄂尔多斯盆地盐池-定边地区长7烃源岩有机地球化学特征及沉积环境研究 |
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| 引用本文： | 席胜利,刚文哲,杨清宇,陈果,刘亚洲,王宁,刘兰.鄂尔多斯盆地盐池-定边地区长7烃源岩有机地球化学特征及沉积环境研究[J].现代地质,2019,33(4):890-901. |
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| 作者姓名： | 席胜利 刚文哲 杨清宇 陈果 刘亚洲 王宁 刘兰 |
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| 作者单位： | 1.中国石油长庆油田分公司 勘探事业部,陕西 西安 7100182.中国石油大学(北京) 地球科学学院,北京 1022493.中国石油大学(北京) 油气资源与探测国家重点实验室,北京 102249 |
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| 基金项目： | 中国石油长庆油田分公司陕北石油预探项目组重大攻关项目(2016-007) |
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| 摘 要： | 通过对鄂尔多斯盆地盐池-定边地区长7段烃源岩的分析,研究区长7段烃源岩有机碳平均含量为3.22%,生烃潜量均值为12.8 mg/g,氯仿沥青“A”均值为0.55%,可以划分为较好-好的烃源岩,具有良好的生烃潜力。利用有机岩石学分析、热解分析,并结合饱和烃生物标志物分析,发现研究区长7段烃源岩有机质类型以Ⅱ1型和Ⅱ2型为主,有机质以菌藻类生源为主,并伴有部分高等植物生源。烃源岩有机质成熟度Ro值介于0.42%~0.76%之间,并且热解Tmax也主要集中在440~455 ℃之间,并且正构烷烃分布特征及甾、藿烷异构化参数说明烃源岩有机质处于低熟-成熟度阶段。根据饱和烃中甾藿烷参数、三环萜烷参数、伽马蜡烷指数、β-胡萝卜烷相对含量以及姥植比参数特征,研究区长7段烃源岩沉积环境为湖相淡水弱氧化-弱还原环境。
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| 关 键 词： | 盐池-定边地区 烃源岩 有机地球化学特征 沉积环境 |
Organic Geochemistry and Sedimentary Paleoenvironment of Chang 7 Source Rocks in Yanchi-Dingbian Area,Ordos Basin |
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| XI Shengli,GANG Wenzhe,YANG Qingyu,CHEN Guo,LIU Yazhou,WANG Ning,LIU Lan.Organic Geochemistry and Sedimentary Paleoenvironment of Chang 7 Source Rocks in Yanchi-Dingbian Area,Ordos Basin[J].Geoscience——Journal of Graduate School,China University of Geosciences,2019,33(4):890-901. |
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| Authors: | XI Shengli GANG Wenzhe YANG Qingyu CHEN Guo LIU Yazhou WANG Ning LIU Lan |
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| Institution: | 1. Exploration Apartment,PetroChina, Changqing Oilfield Company, Xi’an, Shaanxi 710018, China2. College of Geosciences, China University of Petroleum, Beijing 120049, China3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China |
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| Abstract: | Analysis of the Chang 7 source rocks in Yanchi-Dingbian area (Ordos Basin) indicates that the total organic carbon, hydrocarbon potential and chloroform extracted bitumen “A” are on average 3.22 %, 12.8 mg/g and 0.55 %, respectively. Based on these results, the source rocks can be classified into the fair to good categories, suggesting a high hydrocarbon potential. Organic petrology, rock-eval and biomarker evidence suggest that the main types of organic matter are Ⅱ1 and Ⅱ2, and that the organic matter source is dominated by algae or bacteria with minor high plant. The Ro and Tmax of the source rocks are of 0.42% to 0.76% and 440 ℃ to 460 ℃, respectively. The normal distribution, steranes and hopanes isomerization parameters indicate that the organic matter varies from lowly-mature to mature. In addition, the parameters of steranes, hopanes, tricyclic terpene, gammacerane, β-carotane and Pr/Ph indicate that the sedimentary environment of Chang 7 was lacustrine-brackish, and weakly oxidized or weakly reduced. |
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| Keywords: | Yanchi-Dingbian area source rock organic geochemistry sedimentary paleoenvironment |
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