超深层碎屑岩储层裂缝充填流体迁移规律——以库车坳陷克深井区白垩系巴什基奇克组为例

doi:10.7623/syxb202003004

石油学报 ›› 2020, Vol. 41 ›› Issue (3): 292-300.DOI: 10.7623/syxb202003004

超深层碎屑岩储层裂缝充填流体迁移规律——以库车坳陷克深井区白垩系巴什基奇克组为例

张月^1,2, 韩登林^1,2, 杨铖晔^1,2, 袁瑞³, 王晨晨^2,4, 张娟^1,2

1. 长江大学地球科学学院湖北武汉 430100;
2. 储层微观结构演化及数字表征实验室湖北武汉 430100;
3. 长江大学信息与数学学院湖北武汉 434023;
4. 非常规油气湖北省协同创新中心湖北武汉 430100

收稿日期:2019-07-27 修回日期:2019-12-22 出版日期:2020-03-25 发布日期:2020-04-03
通讯作者: 韩登林,男,1979年11月生,2002年获长江大学学士学位,2007年获中国科学院地质与地球物理研究所博士学位,现为长江大学地球科学学院教授,主要从事储层成岩作用与储层沉积学方面的教学与科研工作。Email:handl@yangtzeu.edu.cn
作者简介:张月,女,1994年7月生,2017年获长江大学工程技术学院学士学位,现为长江大学地球科学学院矿产普查与勘探专业硕士研究生,主要从事储层地质学方向工作。Email:329850235@qq.com
基金资助:
国家科技重大专项（2017ZX05008-003-050）资助。

Migration law of fracture filling fluid in ultra-deep clastic reservoirs: a case study of the Cretaceous Bashijiqike Formation in Keshen well block,Kuqa depression

Zhang Yue^1,2, Han Denglin^1,2, Yang Chengye^1,2, Yuan Rui³, Wang Chenchen^2,4, Zhang Juan^1,2

1. College of Geosciences, Yangtze University, Hubei Wuhan 430100, China;
2. Laboratory of Reservoir Microstructure Evolution and Digital Characterization, Hubei Wuhan 430100, China;
3. School of Information and Mathematics, Yangtze University, Hubei Wuhan 434023, China;
4. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Hubei Wuhan 430100, China

Received:2019-07-27 Revised:2019-12-22 Online:2020-03-25 Published:2020-04-03

摘要/Abstract

摘要：

库车坳陷克深井区白垩系储层是埋深超过6 km的超深层碎屑岩储层，其具有典型的孔缝型储层特征。裂缝的发育与分布是储层储集性能改善的重要因素。深层储层内裂缝体系下流体活动活跃，主要表现为多尺度、多组分、多期次的胶结充填效应，但有关流体的活动特征目前尚未有清晰的认识。综合利用岩心观察、薄片鉴定，阴极发光等研究方法，结合碳、氧同位素实验分析与流体包裹体测温实验，针对研究区裂缝充填情况以及对裂缝充填物的期次分析，明确了克深地区不同井区的充填程度以及充填物的特征规律。研究结果表明：裂缝具有两期方解石充填的特点，两期大规模流体迁移活动均发生在新近纪以来的喜马拉雅运动中期。第1期发生在距今12.2~7.4 Ma，对应地层快速下降再缓慢抬升的过程；第2期发生在5.5~3.8 Ma，地层发生快速沉降，流体进入裂缝发生胶结充填效应。

关键词: 超深层, 碎屑岩储层, 裂缝, 流体, 库车坳陷

Abstract:

The Cretaceous reservoirs in Keshen well block of the Kuqa depression are ultra-deep clastic reservoirs with a burial depth of more than 6 km, which have the typical characteristics of pore-fracture type reservoir. The development and distribution of fractures is an important factor for improving reservoir property. The fluid activity in the fracture system in deep reservoirs is active, mainly shown as the multi-scale, multi-component and multi-stage cemented filling effect; however, there is still not a clear understanding of the characteristics of fluid activity. Aiming at fracture filling in the study area, an analysis is performed on the stage of fracture fillings. On this basis, comprehensively using core observation, thin section identification and cathodoluminescence, in combination with the experimental analysis of carbon and oxygen isotope and the experiment of homogenization temperature of fluid inclusions, this study clarifies the filling degree in different well areas and the characteristics of fillings in the Keshen area. The results show that the fractures have the characteristics of two stages of calcite filling, and there were two stages of large-scale fluid migration activities, both of which occurred during the middle period of the Himalayan Movement since Neogene. The first stage occurred from 12.2 Ma to 7.4 Ma, corresponding to the rapid descent and later slow uplift of the formation; the second stage occurred from 5.5 Ma to 3.8 Ma, when the formation experienced rapid subsidence and the fluid entered the fracture to produce a cemented filling effect.

Key words: ultra-deep layer, clastic reservoir, fracture, fluid, Kuqa depression

中图分类号:

TE122.2

张月, 韩登林, 杨铖晔, 袁瑞, 王晨晨, 张娟. 超深层碎屑岩储层裂缝充填流体迁移规律——以库车坳陷克深井区白垩系巴什基奇克组为例[J]. 石油学报, 2020, 41(3): 292-300.

Zhang Yue, Han Denglin, Yang Chengye, Yuan Rui, Wang Chenchen, Zhang Juan. Migration law of fracture filling fluid in ultra-deep clastic reservoirs: a case study of the Cretaceous Bashijiqike Formation in Keshen well block,Kuqa depression[J]. Acta Petrolei Sinica, 2020, 41(3): 292-300.

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超深层碎屑岩储层裂缝充填流体迁移规律——以库车坳陷克深井区白垩系巴什基奇克组为例

Migration law of fracture filling fluid in ultra-deep clastic reservoirs: a case study of the Cretaceous Bashijiqike Formation in Keshen well block,Kuqa depression

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