新疆石油地质

新疆石油地质 ›› 2009, Vol. 30 ›› Issue (5): 557-559.

• 油气勘探 • 上一篇    下一篇

陆西地区火山岩中碳酸盐矿物氧碳稳定同位素特征

孔玉华1a, 沈新安1b, 李桂秋2, 单守会1a, 李刚1c   

  1. 1.中国石油 新疆油田分公司 a.勘探开发研究院;b.黑油山有限责任公司;c.井下作业公司,新疆 克拉玛依 834000;
    2.中国石油 新疆西部钻探测井公司,克拉玛依 834000
  • 收稿日期:2008-10-29 修回日期:2009-03-06 出版日期:2009-10-01 发布日期:2020-09-30
  • 作者简介:孔玉华（1974-）,女,江苏泰县人,高级工程师,综合勘探, （Tel）0990-6245857（E-mail）Kyuhua@petrochina.com.cn.

Characteristic of Carbonate Oxygen-Carbon Stable Isotopes in Volcanic Rocks in Luxi Area,Junggar Basin

KONG Yu-hua1a, SHEN Xin-an1b, LI Gui-qiu2, SHAN Shou-hui1a, LI Gang1c   

  1. 1.a.Xinjiang Oilfield Company, PetroChina, Research Institute of Exploration and Development; b.Heiyoushan Company Ltd; c.Downhole Servicing Operation Company, Karamay, Xinjiang 834000, China;
    2.Xinjiang West Drilling Logging Company, PetroChina, Karamay,Xinjiang 834000, China
  • Received:2008-10-29 Revised:2009-03-06 Online:2009-10-01 Published:2020-09-30

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摘要： 准噶尔盆地陆西地区火山岩孔隙中充填的碳酸盐岩对储集层物性产生巨大影响,通过对碳酸盐充填物的氧 碳稳定同位素分析表明,δ 13 C 和 δ 18 O 值均较轻且 Z 值较低,反映其形成于淡水环境,碳酸盐结晶温度大致分 3 种情 况：早成岩作用阶段早期占大多数,部分形成于表生风化淋滤阶段,个别形成于热液作用阶段。通过氧同位素与古地 温间的关系,推测碳酸盐充填物的结晶时间大致为晚三叠世到早侏罗世。烃源岩低成熟至成熟早期,靠近生烃凹陷的 低凸带上,受淡水淋滤作用,火山岩中仍然存在部分未被碳酸盐岩充填的气孔。烃源岩大量排烃期,靠近凹陷区受溶 蚀作用较强,可能存在相对优质的火山岩储集层发育区。

关键词: 准噶尔盆地, 火山岩, 氧同位素, 沉积环境, 碳同位素, 孔隙

Abstract: The study of the volcanic rocks in Luxi area of Junggar basin indicates that the carbonate minerals placing in pores has great effect on the reservoir property. The oxygen-carbon stable isotopes in them are analyzed, showing that the values of δ 13 C and δ 18 O are lighter and Z value is low, which reflect they are formed in fresh water environment. Based on the carbonate crystallization temperature they occur in three settings: the most carbonate minerals are formed in the early stage of early diagenesis, some formed in the weathered and leaching stage, a few in the hydrothermal stage. Through the relationship between the oxygen isotope and the paleo-temperature, it is deduced that the crystallization time of spacing carbonate minerals could be from Late Triassic to Early Jurassic. The source rocks reach the stage of low maturity to early high maturity. They are distributed in low swell zone adjacent to the source sag and subjected to fresh- water leaching process. In the volcanic rocks there still exists part of the pores not filled by the carbonate minerals. In period of major hydrocarbon expulsion from the source rocks, the nearer the source sag, the stronger the solution is, and there could be relatively premium volcanic reservoirs in this area.

Key words: Junggar basin, volcanic rocks, oxygen isotope, carbon isotope, sedimentary environment, pore

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