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《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

卷:

期数:

2019年02期

页码:

145

栏目:

出版日期:

2019-03-28

文章信息/Info

Title:

Genesis of High-Yield Oil and Gas in Well Gaotan-1 and Characteristics of Source Rocks in Sikeshu Sag, Junggar Basin

文章编号:

1001-3873（2019）02-0145-07

作者:

靳军1; 王飞宇2; 任江玲1; 冯伟平3; 马万云1; 李思嘉2

(1. 中国石油 新疆油田分公司 实验检测研究院,新疆 克拉玛依 834000;2.中国石油大学 a.油气资源与探测国家重点实验室;b.地球科学学院,北京 102249;3.中国地质科学院 地质力学研究所,北京 100081)

Author(s):

JIN Jun1;  WANG Feiyu2;  REN Jiangling1;  FENG Weiping3;  MA Wanyun1;  LI Sijia2

(1.Research Institute of Experiment and Detection, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China; 2.China University of Petroleum, a.State Key Laboratory of Petroleum Resources and Prospecting; b.School of Geosciences, Beijing 102249, China; 3.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China)

关键词:

准噶尔盆地; 四棵树凹陷; 高探1井; 轻质油; 侏罗系; 烃源岩; 有机相

Keywords:

Junggar basin;  Sikeshu sag;  Well Gaotan-1;  light oil;  Jurassic;  source rock;  organic phase

分类号:

TE112.111

DOI:

10.7657/XJPG20190203

文献标志码:

A

摘要:

准噶尔盆地南缘四棵树凹陷于2019年1月在白垩系清水河组获得重大突破，高探1井喜获日产千方工业油气流，创准噶尔盆地单井日产量最高纪录，证实了准噶尔盆地四棵树凹陷具有巨大的勘探潜力。为了准确评价四棵树凹陷的资源潜力，为进一步勘探部署提供依据，系统分析了高探1井及周边探井油气性质和侏罗系烃源岩特征，讨论了四棵树凹陷油气成因与灶藏关系。研究表明，高探1井白垩系出油气层气油比为260~360 m3/ m3，原油为轻质油，具有低密度、低黏度特征。原油碳同位素重，为-26.83‰，Pr/Ph值高达3.6，三环萜烷分布以C19为最高，C20，C21依次降低，具有煤系烃源岩典型的地球化学特征。天然气组成中甲烷含量为74.44%，甲烷碳同位素为-40.35‰，乙烷碳同位素为-28.74‰，为相对富含壳质组的偏腐殖型湿气。油气性质特征指示高探1井油气主要来自侏罗系D/E相烃源岩。烃源岩分析表明，四棵树凹陷中—下侏罗统发育D/E相和F相烃源岩，凹陷中心处于凝析油—湿气阶段，具有较高的生油气潜力，研究区侏罗系含油气系统具有广阔勘探潜力。

Abstract:

A great breakthrough was achieved in Cretaceous Qingshuihe formation of Sikeshu sag in the southern margin of Junggar basin in January, 2019, and more than one thousand tons of commercial oil and gas flow per day has been obtained from the Well Gaotan-1, which set a new record of well daily production in Junggar basin. Meanwhile, the great exploration potential in Sikeshu sag of Junggar basin has been proved. To accurately evaluate the resources in Sikeshu sag and provide a basis for exploration deployment, the paper systematically analyzes the hydrocarbon properties in the well and its surrounding exploration wells and the characteristics of Jurassic source rocks, and discusses the relationship between hydrocarbon generation and accumulation in the sag. The study shows that the gas-oil ratio（GOR）of the Cretaceous pay zone in the Well Gaotan-1 is 260~360 m3/m3, and the crude oil is light oil with low density and low viscosity. The carbon isotope ratio of the crude oil is -26.83‰ with Pr/Ph as high as 3.6, and the abundance of tricyclic terpane C19, C20 and C21 decrease gradually, indicating typical geochemical characteristics of coal-bearing source rocks. The natural gas in the Well Gaotan-1 is exinite-rich, humic-type wet gas with the methane content of 74.44%, the carbon isotope ratio of methane and ethane of -40.35‰ and -28.74‰, respectively. The above hydrocarbon characteristics indicate that the oil and gas in the Well Gaotan-1 mainly come from Jurassic source rocks with the organic phase of D/E. The systematic source rock analysis shows that the source rocks of D/E and F organic phases are developed in the Middle—Lower Jurassic strata in Sikeshu sag, and the sag center is in condensate oil—wet gas stage and has high hydrocarbon generating potential. It is considered that the Jurassic petroleum system in the study area has great exploration potential

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更新日期/Last Update: 2019-03-28