岩性油气藏 ›› 2024, Vol. 36 ›› Issue (1): 23–31.doi: 10.12108/yxyqc.20240103

• 地质勘探 • 上一篇    下一篇

准噶尔盆地沙湾凹陷二叠系上乌尔禾组流体相态及油气藏类型

王金铎1, 曾治平1, 徐冰冰2,3, 李超2, 刘德志1, 范婕1, 李松涛1, 张增宝4   

  1. 1. 中国石化胜利油田分公司 勘探开发研究院, 山东 东营 257015;
    2. 中国科学院 地质与地球物理研究所, 北京 100029;
    3. 中国科学院大学, 北京 100049;
    4. 中国石化新疆新春石油开发有限责任公司, 山东 东营 257000
  • 收稿日期:2023-07-03 修回日期:2023-07-28 出版日期:2024-01-01 发布日期:2024-01-02
  • 第一作者:王金铎(1966-),男,博士,教授级高级工程师,主要从事油气勘探部署与管理工作。地址:(257015)山东省东营市东营区聊城路2号。Email:wangjinduo.slyt@sinopec.com。
  • 通信作者: 徐冰冰(1999-),女,中国科学院大学在读硕士研究生,研究方向为油气相态与盆地模拟。Email:xb2335833217@163.com。
  • 基金资助:
    中国石化科技部项目“准噶尔盆地石炭—二叠系潜力评价与目标优选”（编号：P21077-1）及“准噶尔盆地腹部下组合油气成藏条件与勘探方向”（编号：P22132）联合资助。

Fluid phase and hydrocarbon reservoir types of Permian Upper Urho Formation in Shawan Sag，Junggar Basin

WANG Jinduo1, ZENG Zhiping1, XU Bingbing2,3, LI Chao2, LIU Dezhi1, FAN Jie1, LI Songtao1, ZHANG Zengbao4   

  1. 1. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, Shandong, China
  • Received:2023-07-03 Revised:2023-07-28 Online:2024-01-01 Published:2024-01-02

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摘要： 准噶尔盆地腹部地区沙湾凹陷超深层蕴含丰富的油气资源。根据烃源岩热演化模拟实验分析了沙湾凹陷二叠系上乌尔禾组烃源岩生烃产物类型，结合地层流体高温高压物性实验数据，运用相图判别法和经验参数法对沙湾凹陷征10井地层流体相态进行深入研究。研究结果表明： ①沙湾凹陷征10井上乌尔禾组油气主要来自于下乌尔禾组泥质烃源岩，其有机质类型为Ⅱ1型，镜质体反射率（Ro）为1.05%～1.46%，岩石热解峰温（Tmax）为433～446℃，处于成熟—高成熟演化阶段，目前处于生轻质油阶段。②上乌尔禾组地层流体成分表现为凝析气藏的流体组成，地层温度为166.0℃，介于临界温度和临界凝析温度之间，地层压力为155 MPa，远高于露点压力，地-露压差大，表明地层条件下流体呈凝析气相特征，但地下油气相态与地表采出流体相态具有一定差异。相图判别法和经验参数法烃类流体相态分析结果均显示，征10井上乌尔禾组气藏为含大油环的凝析气藏。③沙湾凹陷上乌尔禾组具有优越的成藏条件，紧邻下乌尔禾组烃源岩，油气近源垂向输导，向局部隆起区运聚，巨厚的三叠系及上乌尔禾组中上部区域盖层起到重要的封盖作用，最终在局部隆起区形成岩性-构造凝析气藏。

关键词: 油气相态, 超深层, 凝析气藏, 近源成藏, 上乌尔禾组, 征10井, 二叠系, 沙湾凹陷, 准噶尔盆地

Abstract: There are abundant oil and gas resources in the super-deep strata of Shawan Sag in the hinterland of Junggar Basin. Thermal evolution simulation of source rocks was carried out to analyze the types of hydrocarbon generation products of source rocks of Permian Upper Urho Formation in Shawan Sag. Based on the experimental data of the high-temperature and high-pressure physical properties of the formation fluid, the formation fluid phase of well Zheng10 in Shawan Sag was studied by using phase diagram discrimination method and empirical parameter method. The results show that:(1) The oil and gas of Upper Urho Formation of well Zheng 10 in Shawan Sag mainly came from the argillaceous source rocks of Lower Urho Formation, with an organic matter type of Ⅱ1, a vitrinite reflectance(Ro) of 1.05% to 1.46%, and a rock pyrolysis peak temperature(Tmax) of 433℃ to 446℃. It is in the mature to high mature evolution stage and currently in the stage of light oil generation.(2) The fluid composition of the Upper Urho Formation is conforming to the fluid composition of condensate gas reservoir, with a formation temperature of 166.0℃, which is between the critical temperature and the critical condensate temperature. The formation pressure is 155 MPa, much higher than the dew-point pressure, with a large surface and dew-point pressure difference, indicating that the fluid exhibits condensate gas phase characteristics under formation conditions, but there are certain differences between the underground oil and gas phase state and the surface produced fluid phase state. Both the phase diagram discrimination method and the empirical parameter method show that the gas reservoirs of Upper Urho Formation in well Zheng 10 are condensate gas reservoirs with a large oil-ring.(3) The Upper Urho Formation in Shawan Sag has superior hydrocarbon accumulation conditions, adjacent to the source rocks of Lower Urho Formation. Oil and gas are transported vertically near the source, migrating and accumulating towards local uplift areas. The thick Triassic and regional cap rocks of the upper part of Upper Urho Formation play an important sealing role, ultimately forming lithologic-structural condensate gas reservoirs in local uplift areas.

Key words: hydrocarbon phase, ultra-deep layer, condensate gas reservoirs, near-source accumulation, Upper Urho Formation, well Zheng 10, Permian, Shawan Sag, Junggar Basin

中图分类号: 

  • TE122.1
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