柴西地区古近系—新近系天然气成藏条件分析及目标优选

doi:10.3969/j.issn.1006-6535.2021.01.004

特种油气藏 ›› 2021, Vol. 28 ›› Issue (1): 26-33.DOI: 10.3969/j.issn.1006-6535.2021.01.004

柴西地区古近系—新近系天然气成藏条件分析及目标优选

田建华¹, 董清源¹, 刘军²

1.中国石化石油物探技术研究院,江苏南京 211103;
2.中国石油青海油田分公司,甘肃敦煌 736202

收稿日期:2020-02-01 修回日期:2020-11-07 出版日期:2021-02-25 发布日期:2021-04-27
通讯作者: 董清源(1987—),男,工程师,2010年毕业于长江大学资源勘查工程专业,2013年毕业于中国石油大学(北京)矿产普查与勘探专业,获硕士学位,现主要从事地震、地质综合研究工作。
作者简介:田建华(1974—),男,高级工程师,1997年毕业于江汉石油学院石油地质专业,现主要从事地震、地质综合研究工作。
基金资助:
国家自然科学基金“氯化盐浓度对气源岩生成天然气组成的影响”(41272159);国家科技重大专项“岩性地层油气藏成藏规律、关键技术及目标评价”(2017ZX05001-002)

Analysis on Accumulation Conditions and Target Optimization of Paleogene - Neogene Gas Reservoirs in Western Qaidam Basin

Tian Jianhua¹, Dong Qingyuan¹, Liu Jun²

1. Sinopec Geophysical Research Institute, Nanjing, Jiangsu 211103, China;
2. PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736202, China

Received:2020-02-01 Revised:2020-11-07 Online:2021-02-25 Published:2021-04-27

摘要/Abstract

摘要： 柴达木盆地西部地区古近系—新近系油气资源丰富,但天然气勘探程度相对较低,为了推进研究区天然气勘探新局面,以源-盖控烃、构造-储层-圈闭控藏的选区评价思路为指导,综合运用实验分析、盆地模拟及地质评价技术,研究气源岩、储集层、圈闭、盖层及保存条件等特征,并提出有利勘探目标。研究结果表明:柴西地区气源岩(R_o≥0.8%)有5套,主力气源岩为E₃²和N₁,具有明显晚期生烃特征,主要分布在柴西北及靠近茫崖凹陷的柴西南局部地区,面积约为4 743.40 km²,生烃总量约为1.17×10¹²m³;柴西地区储层分为碎屑岩和碳酸盐岩两大类,岩性致密,物性变化较大;柴西地区存在2套区域性盖层,深层盖层保存条件好,浅层盖层保存条件差;有效气源岩区深层主要以E₃¹、E₃²晚期(断)背斜及断鼻等构造圈闭为主,与生气期、成藏期及保存期时空匹配一致。在此基础上,优选了狮子沟-干柴沟、咸水泉-油泉子-黄瓜峁和南翼山3个天然气有利勘探区带,明确了12个有利圈闭和3个较有利圈闭。研究结果对柴西地区天然气的深入勘探具有一定借鉴意义。

关键词: 天然气藏, 成藏条件, 古近系, 新近系, 柴西地区

Abstract: There are abundant Paleogene-Neogene oil and gas resources in the western Qaidam Basin, but the natural gas exploration level is relatively low. In order to promote future exploration of natural gas in the study area, the study area was selected and evaluated by ideas of source-cap rock controlling hydrocarbon accumulation and structure-deposit-trap controlling reservoir, secondly, experimental analysis, basin simulation and geological evaluation technologies are used to study the characteristics of gas source rock, reservoir stratum, trap, caprock and preservation conditions, and finally, favorable exploration targets were proposed. The findings show that there are 5 sets of gas source rocks (R_o ≥ 0.8%) taken from the western Qaidam Basin, the primary gas source rocks are E₃² and N₁, with significant late hydrocarbon generation characteristics, mainly distributed in the northwest Qaidam Basin and locally in the southwestern Qaidam Basin near the Mangya depression, with an area of about 4 743.40 km² and a total hydrocarbon amount generated of about 1.17×10¹² m³; the reservoirs in the western Qaidam Basin are classified by two types: clasolite and carbonatite, with tight lithology and petrophysical changes; there are 2 sets of regional caprocks in the western Qaidam Basin; the deep caprock is properly preserved while the shallow caprock is poorly preserved; the deep layers of the effective gas source rock area are dominated by structural traps such as late E₃¹ and E₃² (fault) anticlines and fault noses, and consistent in time and space in gas generation period, accumulation period and preservation period. Based on above findings, three favorable natural gas exploration zones, namely Shizigou-Ganchaigou, Xianshuiquan-Youquanzi-Cucumbermao and Nanyishan were selected, and 12 favorable traps and 3 more favorable traps were identified. There is much for reference of the results of the study to the further exploration of natural gas in western Qaidam Basin.

Key words: natural gas reservoirs, accumulation conditions, Paleogene, Neogene, western Qaidam Basin

中图分类号:

TE122

田建华, 董清源, 刘军. 柴西地区古近系—新近系天然气成藏条件分析及目标优选[J]. 特种油气藏, 2021, 28(1): 26-33.

Tian Jianhua, Dong Qingyuan, Liu Jun. Analysis on Accumulation Conditions and Target Optimization of Paleogene - Neogene Gas Reservoirs in Western Qaidam Basin[J]. Special Oil & Gas Reservoirs, 2021, 28(1): 26-33.

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柴西地区古近系—新近系天然气成藏条件分析及目标优选

Analysis on Accumulation Conditions and Target Optimization of Paleogene - Neogene Gas Reservoirs in Western Qaidam Basin

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