| 库车坳陷大北克深井区白垩系储层含盐特征与分布规律#br# |
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| 引用本文： | 冯佳睿,高志勇,张宇航,李晓红,周鹏,尚江伟,李晨晨.库车坳陷大北克深井区白垩系储层含盐特征与分布规律#br#[J].吉林大学学报(地球科学版),2022,52(1):38-54. |
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| 作者姓名： | 冯佳睿 高志勇 张宇航 李晓红 周鹏 尚江伟 李晨晨 |
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| 作者单位： | １．中国石油勘探开发研究院石油地质实验研究中心,北京 １０００８３
２．提高石油采收率国家重点实验室,北京 １０００８３
３．中国石油塔里木油田公司资源勘查处,新疆 塔里木 ８４１０００
４．中国石油塔里木油田公司勘探开发研究院,新疆 塔里木 ８４１０００
５．中海油能源发展股份有限公司工程技术分公司,天津 ３００４５２ |
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| 基金项目： | 中国石油十四五上游领域前瞻性基础性课题 |
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| 摘 要： | 塔里木盆地库车坳陷盐下深部储层是天然气勘探的重要领域,白垩系储层岩盐广泛发育,储层含盐特征的精细表征和评价对该区勘探区带优选具有重要意义.以库车坳陷大北克深井区白垩系砂岩储层７２件岩心样品为研究对象,通过薄片、扫描电镜、能谱分析与QEMSCAN(岩石矿物定量分析)等技术手段,对研究区白垩系砂岩储层的含盐特征、分布规律、形成条件及来源等进行研究.结果表明:岩盐晶体主要赋存在碎屑颗粒间、碎屑颗粒表面和溶蚀孔与裂缝中,呈格架状、晶粒状和团块状集合体等３种赋存状态,不同状态岩盐晶体Na和Cl等元素的原子分数存在差异;岩盐分布规律为,平面上表现出西高东低的特点,垂向上距上覆膏盐岩层越近,岩盐体积分数越高;不同的盐源供给条件、储层埋藏深度、砂岩粒级、分选性等制约岩盐晶体的集合体形态;岩盐来源主要为古近系膏盐类沉积物的溶蚀渗流,也可能与含盐流体沿构造断裂的侧向渗入有关.
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| 关 键 词： | 岩盐 白垩系 大北克深 库车坳陷 储层 |
| 收稿时间： | 2021-01-06 |
Salt-Bearing Characteristics and Distribution of Cretaceous Reservoirs of the Dabei and Keshen Areas in the Kuqa Depression |
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| Feng Jiarui,Gao Zhiyong,Zhang Yuhang,Li Xiaohong,Zhou Peng,Shang Jiangwei,Li Chenchen.Salt-Bearing Characteristics and Distribution of Cretaceous Reservoirs of the Dabei and Keshen Areas in the Kuqa Depression[J].Journal of Jilin Unviersity:Earth Science Edition,2022,52(1):38-54. |
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| Authors: | Feng Jiarui Gao Zhiyong Zhang Yuhang Li Xiaohong Zhou Peng Shang Jiangwei Li Chenchen |
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| Institution: | (Petroleum Geology Research and Laboratory Center,Research Institute of Petroleum Exploration and Development,Beijing 100083,China;State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China;Resources Exploration Office of PetroChinaTarim Oilfield Company,Tarim 841000,Xinjiang,China;Research Institute of Petroleum Exploration and Development PetroChina Tarim Oilfield Company,Tarim 841000,Xinjiang,China;Unconventional Oil and Gas Technology Institute,CNOOC Ener Tech-Drilling and Production Co.,Ltd.,Tianjin300452,China) |
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| Abstract: | The deep subsalt reservoir
is an important field for natural gas exploration in Kuqa depression. The salt
is widely developed in the Cretaceous reservoirs, and the detailed
characterization and evaluation of salt-bearing characteristics of the
reservoirs is of great significance to the optimization of exploration zones in
this area. By taking 72 core samples in the Cretaceous sandstone reservoirs as the
research object, based on thethin section identification, scanning electron
microscope, spectrum and QEMSCAN analysis, the microscopic characteristics,
distribution, diagenetic conditions, and provenance of salt in the Cretaceous
reservoirs were studied. The results show that the halite crystals in the
Cretaceous sandstone reservoirs occurred between clastic particles, on the
surface of clastic particles, and in the dissolution pores and cracks, and they
existmainly in three forms: Skeleton crystal, grain-shaped, and block-shaped.
Different types of halite crystals have different atomic percentages of
elements such as Na and Cl. In the whole Dabei and Keshen area, the
distribution of halite content is higher in the west and lower in the east, and
the closer the vertical distance is to the overlying gypsum layer, the higher
the salt content. The aggregate form of the halite crystals is affected by many
factors, such as salt source supply conditions, reservoir burial depth,
sandstone particle size and sorting, etc. The salt source is mainly the
dissolution seepage of the Paleogene paste salt sediments, and it may also be
related to the lateral infiltration of saline fluids along tectonic faults. |
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| Keywords: | halite Cretaceous Dabei and Keshen area Kuqa depression reservoir |
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