韦德迈阿盆地盖尔达耶地区油气成藏与勘探潜力

doi:10.3969/j.issn.1672-7703.2024.06.003

摘要/Abstract

摘要： 韦德迈阿盆地盖尔达耶地区是阿尔及利亚北部的一个油气高产地区，油气资源勘探开发潜力大。系统地研究该地区石油地质特征和成藏规律，深入分析勘探潜力，对我国油气企业投资阿尔及利亚油气业务具有重要意义。根据韦德迈阿盆地的地质、地球化学和文献资料的综合分析，从烃源岩展布及生烃潜力、储层分布、成藏期次和富集规律等方面，对成藏主要控制要素进行深度剖析，编制主要源储及油气地质图件，计算生烃潜量，剖析油藏成藏组合和运移规律。研究认为，该盆地志留系底部发育一套高丰度的优质烃源岩，东北部以生油为主，南部以生气为主，主要生烃灶位于研究区的东南部；储层为中三叠统T2 组A 砂组、T1 组B 砂组和奥陶系哈马哈组石英砂岩；油气通过沟源断层垂向运移至三叠系输导层，之后以侧向运移为主。提出了“热页岩供烃、长距离运移、晚期富集”的油气成藏模式。未来勘探目标以三叠系A 砂组内构造圈闭为主，同时需要重点关注三叠系B 砂组、奥陶系致密储层和页岩油气勘探目标。

关键词: 韦德迈阿盆地, 盖尔达耶地区, 油气地质, 油气成藏, 勘探方向

Abstract: Ghardaia area, located in the northern Algeria, is a prolific zone in Oued Mya Basin, showing great potential for the exploration and development of oil and gas resources. It is necessary to conduct a systematic study of the petroleum geological characteristics and hydrocarbon accumulation rules, as well as the exploration potential in this area, which has important significance for investing in the Algerian oil and gas business of Chinese oil and gas enterprises. Based on the comprehensive study of geological, geochemical, and relevant literature data of Oued Mya Basin, a detailed analysis of controlling factors for hydrocarbon accumulation has been conducted, including the distribution of source rocks and their hydrocarbon generation potential, reservoir distribution, and hydrocarbon accumulation timing and rules. In addition,some geological maps have been prepared for the main source rocks, reservoirs, and hydrocarbon accumulation patterns, and the hydrocarbon generation potential has been calculated. Furthermore, the hydrocarbon accumulation combination and migration rules have been analyzed. The study results show that a set of high-quality source rock with high organic abundance was developed at the base Silurian, which was dominated by oil generation in the northeastern basin and gas generation in the southern basin, and the primary hydrocarbon kitchen was located in the southeastern part of the study area. The main reservoirs include A sand group in T2 Formation and B sand group in T2 Formation in the Middle Triassic, and the Ordovician Harmar Formation quartz sandstone. The vertical hydrocarbon migration occurred through faults connecting to source rock and then migrated laterally along the Triassic transport layer. As a result, the hydrocarbon accumulation pattern of “hydrocarbon supply by mature shale, long-distance migration, and late-stage enrichment”. The future exploration efforts should focus on structural traps of the Triassic A sand group, while simultaneously emphasizing the exploration of the Triassic B sand group, as well as the Ordovician tight reservoir and shale oil and gas.

Key words: Oued Mya Basin, Ghardaia area, petroleum geology, hydrocarbon accumulation, exploration orientation

中图分类号:

TE112.3

张忠民, 张发强, 曹喆, 吕雪雁, 周瑜, 程明, 闫建钊, 朱增硕, 苏玉平. 韦德迈阿盆地盖尔达耶地区油气成藏与勘探潜力[J]. 中国石油勘探, 2024, 29(6): 30-42.

Zhang Zhongmin, Zhang Faqiang, Cao Zhe, Lv Xueyan, Zhou Yu, Cheng Ming, Yan Jianzhao, Zhu Zengshuo, Su Yuping. Hydrocarbon accumulation pattern and exploration potential in Ghardaia area,Oued Mya Basin[J]. China Petroleum Exploration, 2024, 29(6): 30-42.

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