Numerical simulation of fractured reservoir stress sensitivity：a case from Kuqa depression Keshen gas field

doi:10.7623/syxb201401015

ACTA PETROLEI SINICA ›› 2014, Vol. 35 ›› Issue (1): 123-133.DOI: 10.7623/syxb201401015

• Oil Field Development • Previous Articles Next Articles

Numerical simulation of fractured reservoir stress sensitivity：a case from Kuqa depression Keshen gas field

Wang Ke¹, Dai Junsheng¹, Zhang Hongguo², Zhang Dandan¹, Zhao Libin³

1. School of Geosciences, China University of Petroleum, Qingdao 266580, China;
2. Institute of Exploration and Development, Tianjin Branch of CNOOC China Limited, Tianjin 300452, China;
3. Research Institute of Exploration & Development, PetroChina Tarim Oilfield Company, Korla 841000, China

Received:2013-07-03 Revised:2013-10-20 Online:2014-01-25 Published:2013-12-09

裂缝性储层应力敏感性数值模拟 ——以库车坳陷克深气田为例

王珂¹, 戴俊生¹, 张宏国², 张丹丹¹, 赵力彬³

1. 中国石油大学地球科学与技术学院山东青岛 266580;
2. 中海石油(中国)有限公司天津分公司勘探开发研究院天津 300452;
3. 中国石油塔里木油田公司勘探开发研究院新疆库尔勒 841000

通讯作者: 王珂，男，1987年7月生，2009年毕业于中国石油大学（华东）资源勘查工程专业，现为中国石油大学（华东）地球科学与技术学院博士研究生，主要从事储层地质及裂缝预测研究。Email：wangkerrr@126.com
作者简介:王珂，男，1987年7月生，2009年毕业于中国石油大学（华东）资源勘查工程专业，现为中国石油大学（华东）地球科学与技术学院博士研究生，主要从事储层地质及裂缝预测研究。Email：wangkerrr@126.com
基金资助:
国家重大科技专项（2011ZX05003-04，2011ZX05042-001）和中央高校基本科研业务费专项资金项目（12CX06004A）资助。

Abstract

Abstract:

There are certain difficulties in practical research and quantitative analysis of stress sensitivity in fractured reservoirs using conventional methods. The stress sensitivity and its influencing factors in fractured reservoirs are investigated by numerical simulation of the fractures in Kuqa depression Keshen gas field. Results show that both the porosity and permeability of fractures decline with increasing effective stress, showing strong stress sensitivity. Fracture permeability has higher stress sensitivity than fracture porosity, and their stress sensitivity curves can be fitted using an exponential function. The reservoir with higher initial fracture permeability has stronger stress sensitivity. That is, high-permeability reservoir has higher stress sensitivity than low-permeability reservoir; in the latter case, the reservoir with greater rock plasticity has higher stress sensitivity. In fractures with different extents of filling, stress sensitivity declines in the order of unfilled fracture, half-filled fracture, and full-filled fracture.

Key words: fractured reservoir, stress sensitivity, effective stress, numerical simulation, influencing factors

摘要：

针对裂缝性储层应力敏感性的常规研究方法难以做到与实际相符且不能定量分析的问题，采用储层裂缝数值模拟方法，对克深气田裂缝性储层的应力敏感性进行了研究，并分析了应力敏感性的影响因素。研究结果显示：随着有效应力的增加，裂缝的孔隙度和渗透率均随之下降，表现出较强的应力敏感，且裂缝渗透率的应力敏感程度强于裂缝孔隙度，并可采用指数函数对应力敏感曲线进行拟合；储层裂缝孔渗参数的初始值越高，其应力敏感性越强，即相对高渗储层的应力敏感性要强于相对低渗储层；对于低渗透的裂缝性储层，储层岩石塑性越强其应力敏感程度越高；不同充填程度裂缝的应力敏感性由强到弱依次为未充填缝、半充填缝和全充填缝。

关键词: 裂缝性储层, 应力敏感性, 有效应力, 数值模拟, 影响因素

CLC Number:

P618.13

Wang Ke, Dai Junsheng, Zhang Hongguo, Zhang Dandan, Zhao Libin. Numerical simulation of fractured reservoir stress sensitivity：a case from Kuqa depression Keshen gas field[J]. ACTA PETROLEI SINICA, 2014, 35(1): 123-133.

王珂, 戴俊生, 张宏国, 张丹丹, 赵力彬. 裂缝性储层应力敏感性数值模拟 ——以库车坳陷克深气田为例[J]. 石油学报, 2014, 35(1): 123-133.

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Numerical simulation of fractured reservoir stress sensitivity：a case from Kuqa depression Keshen gas field

裂缝性储层应力敏感性数值模拟 ——以库车坳陷克深气田为例

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