岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 67–76.doi: 10.12108/yxyqc.20240507

• 地质勘探 • 上一篇    下一篇

琼东南盆地Ⅱ号断裂带新生界多期热流体活动与天然气运聚特征

黄向胜, 闫琢玉, 张东峰, 黄合庭, 罗程飞   

  1. 中海油能源发展股份有限公司 工程技术分公司, 广东 湛江 524057
  • 收稿日期:2022-12-29 修回日期:2023-03-22 出版日期:2024-09-01 发布日期:2024-09-04
  • 第一作者:黄向胜（1988—），男，工程师，主要从事油气地质勘探实验与研究工作。地址：（524057）广东省湛江市坡头区南调路南油二区研究院。Email：huangxsh2@cnooc.com.cn。
  • 通信作者: 闫琢玉（1991—），男，硕士，工程师，主要从事油气地质勘探实验与管理工作。Email：yanzhy3@cnooc.com.cn。
  • 基金资助:
    广东省软科学研究计划项目“广东省海上高温高压油气藏勘探开发企业重点实验室”（编号：2018B030323028）资助。

Characteristics of multi-phase thermal fluid activity and natural gas migration-accumulation of Cenozoic in No. 2 fault zone of Qiongdongnan Basin

HUANG Xiangsheng, YAN Zhuoyu, ZHANG Dongfeng, HUANG Heting, LUO Chengfei   

  1. CNOOC EnerTech- Drilling & Production Co., Zhanjiang 524057, Guangdong, China
  • Received:2022-12-29 Revised:2023-03-22 Online:2024-09-01 Published:2024-09-04

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摘要： 运用流体包裹体、有机地球化学分析和压力模拟手段，综合研究了琼东南盆地东部Ⅱ号断裂带新生界多期热流体活动及天然气运聚特征。研究结果表明：①琼东南盆地东部Ⅱ号断裂带BX19-2构造天然气主要为烃气和CO2，烃气为煤型气和油型气的混合气，但不同气层中天然气组分含量差异较大，浅部三亚组气层为相对高含量的烃气（体积分数为83.93%）和低含量的有机成因CO（2体积分数为7.11%）；较深部的陵水组气层为含量相对较低的烃气（体积分数为16.10%～76.63%）和含量相对较高的幔源CO（2体积分数为18.70%～81.56%）。②流体包裹体和岩石地球化学参数显示烃气运移与3期热流体活动相关，每期热流体的活动深度及引起的热异常程度均存在一定差异。3期含烃热流体活动的时间分别为中新世晚期（约8.8 Ma）、上新世（约4.5～4.1 Ma）和第四纪（约1.1～0.1 Ma）。③热流体是以断裂为主要通道发生垂向高效快速充注。来自宝岛凹陷深部的幔源CO2在上新世晚期—第四纪（约2.2～0.5 Ma）发生充注，并驱替了陵水组储层的烃气。因此，宝岛凹陷Ⅱ号断裂带附近的圈闭可能具有钻遇高CO2含量的风险。

关键词: 天然气成藏, 多期热流体活动, 垂向运移, 流体包裹体, 幔源CO2, 三亚组, 陵水组, 新生界, Ⅱ号断裂带, 琼东南盆地

Abstract: Based on fluid inclusion analysis，organic geochemistry data，and pressure simulation，the multiphase thermal fluid activity and natural gas migration-accumulation in the No. 2 fault zone of the BX19-2 structure in eastern Qiongdongnan Basin were studied. The results show that：（1）The natural gas in the BX19-2 structure primarily consists of hydrocarbon gases and CO2，with the hydrocarbon gases being a mix of coal-derived gas and oil-derived gas. However，there is a significant variation in the composition of natural gas across different gas zones. The shallow gas zones in the Sanya Formation exhibit a relatively high content of hydrocarbon gases（volume fraction of 83.93%）and a low content of organogenic CO2（volume fraction of 7.11%）. In contrast， the deeper gas zones in the Lingshui Formation contain relatively lower concentrations of hydrocarbon gases （volume fraction ranging from 16.10% to 76.63%）and higher concentrations of mantle-derived CO2（volume fraction ranging from 18.70% to 81.56%）.（2）Fluid inclusions and geochemical parameters of rocks indicated that the hydrothermal activity was related to hydrocarbon migration，with variations in the depth and extent of the induced thermal anomalies. There were three phases of hydrocarbon-bearing hydrothermal activities occurred during the late Miocene（approximately 8.8 Ma），Pliocene（approximately 4.5 to 4.1 Ma），and Quaternary （approximately 1.1 to 0.1 Ma），respectively.（3）The hydrothermal fluids primarily utilized faults as major conduits for vertical，efficient，and rapid charging. Mantle-derived CO2 from the deep Baodao Sag was injected during the late Pliocene to Quaternary period（approximately 2.2 to 0.5 Ma），displacing the hydrocarbon gases accumulated in the Lingshui Formation. Therefore，traps near the No. 2 fault zone of the Baodao Sag may pose a risk of encountering gas zones with high CO2 content.

Key words: natural gas accumulation, multi-phase thermal fluid activity, vertical migration, fluid inclusion, mantle-derived CO2, Sanya Formation, Lingshui Formation, Cenozoic, No. 2 fault zone, Qiongdongnan Basin

中图分类号: 

  • TE122.1
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