岩性油气藏 ›› 2022, Vol. 34 ›› Issue (2): 66–74.doi: 10.12108/yxyqc.20220206

• 地质勘探 • 上一篇    下一篇

柴达木盆地英西地区古近系下干柴沟组上段TSR与储层改造

赵思思1, 李建明1,2, 柳金城3, 李积永3, 崔俊3   

  1. 1. 长江大学 地球科学学院, 武汉 430100;
    2. 长江大学 非常规油气省部共建协同创新中心, 武汉 430100;
    3. 中国石油青海油田分公司 勘探开发研究院, 甘肃 敦煌 736202
  • 收稿日期:2021-10-08 修回日期:2021-12-20 出版日期:2022-03-01 发布日期:2022-03-14
  • 第一作者:赵思思(1996-),女,长江大学在读硕士研究生,研究方向为沉积学。地址:(430100)湖北省武汉市蔡甸区大学路111号。Email:2339380351@qq.com
  • 通信作者: 李建明(1962-),男,硕士,教授,主要从事沉积学及储层地质学方面的研究工作。Email:ljm@yangtzeu.edu.cn。
  • 基金资助:
    中国石油天然气股份有限公司科技重大专项“柴达木盆地建设高原大油气田勘探开发关键技术研究与应用”（编号：2016E-01）资助

Thermochemical sulfate reduction(TSR) and reservoir reformation of the upper Paleogene Xiaganchaigou Formation in Yingxi area, Qaidam Basin

ZHAO Sisi1, LI Jianming1,2, LIU Jincheng3, LI Jiyong3, CUI Jun3   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University(Ministry of Education & Hubei Province), Wuhan 430100, China;
    3. Research Institute of Exploration and Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2021-10-08 Revised:2021-12-20 Online:2022-03-01 Published:2022-03-14

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摘要： 硫酸盐热化学还原反应（TSR）作为溶蚀作用的一种重要机制在储层研究中具有重要意义。通过岩心观察、薄片鉴定、扫描电镜、测井等资料的分析，研究了柴达木盆地英西地区下干柴沟组上段TSR特征及其对储层的改造作用。研究结果表明：①TSR反应物主要为烃类与硫酸盐岩，生成物为高含量的H2S，CO2及蚀变烃类、方解石、单质硫、黄铁矿、含硫有机物等，反应起始温度为100~140℃，对应英西地区地层深度为3 113~4 536 m。②英西地区下干柴沟组上段TSR造成了碳酸盐岩孔缝充填物种类繁多，主要包括晶粒状和块状黄铁矿、单质硫及沥青等蚀变矿物，含硫矿物的δ34S值偏大；天然气烃组分具有甲烷含量高、重烃含量低的特征，干燥系数偏大，碳同位素δ13C1值和δ13C2值较大，并且常见H 2S及相对较高含量的CO2等TSR生成物，地层水盐度降低。③TSR相关流体对碳酸盐岩储层进行了改造，埋藏溶蚀作用发育，形成了不同规模的孔洞系统，平均增孔率可达3.5%，在一定程度上优化了储层物性。

关键词: 硫酸盐热化学还原反应（TSR）, 溶蚀孔洞, 储层改造, 下干柴沟组上段, 古近系, 英西地区, 柴达木盆地

Abstract: As an important mechanism of dissolution, thermochemical sulfate reduction(TSR) is of great significance in reservoir research. Through the analysis of core observation, thin section identification, scanning electron microscope and logging data, the TSR characteristics and its effect on reservoir reformation of the upper member of Xiaganchaigou Formation in Yingxi area of Qaidam Basin were studied. The results show that:(1) The reactants of TSR are mainly hydrocarbons and sulfate rocks, and the products are high-content H2S, CO, altered hydrocarbons, calcite, elemental sulfur, pyrite, sulfur-containing organic matter. The initial reaction temperature is 100-140℃, corresponding to the formation depth of 3 113-4 536 m in Yingxi area.(2) TSR of the upper member of Xiaganchaigou Formation in Yingxi area resulted that carbonate pores and fractures were filled with modified minerals such as granular and massive pyrite, elemental sulfur and asphalt. The δ34S value of sulfurbearing minerals is relatively heavy. The hydrocarbon components of natural gas are characterized by high methane content and low heavy hydrocarbon content, and the dryness coefficient is larger. The carbon isotope δ13 C1 and δ13 C2 values are larger, and the TSR products such as H2S and relatively high content of CO2 are common. The salinity of formation water is low.(3) TSR related fluids reformed carbonate reservoir, and burial dissolution developed, forming pore systems of different sizes, with an average pore increase rate of 3.5%, which optimized reservoir physical properties.

Key words: thermochemical sulfate reduction(TSR), dissolved pore and vug, reservoir reformation, upper Xiaganchaigou Formation, Paleogene, Yingxi area, Qaidam Basin

中图分类号: 

  • TE122.2
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