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渗流-应力耦合作用对储层裂缝发育的影响研究
(1.中海油研究总院有限责任公司, 北京 100028;2.中国石油大学(华东)地质力学与工程研究所, 山东 青岛 266580)
RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES
(1.CNOOC Research Institute Co. Ltd., Beijing 100028, China;2.Institute of Geological Mechanics and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China)
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投稿时间:2018-09-15    修订日期:2019-04-10
中文摘要: 裂缝是影响储层高产、稳产的重要因素,而储层处在复杂的地质环境中,裂缝的形成和发育受众多因素的影响,研究各因素间的耦合作用对储层裂缝发育的影响,对指导油气勘探开发具有重要意义。为此,针对任丘油田任11井区雾迷山组碳酸盐岩储层进行了渗流-应力耦合作用对储层裂缝发育的影响研究。研究结果表明:未考虑渗流-应力耦合作用时,研究区最大水平主应力范围为82~100 MPa,从西南到东北逐渐增大;最小水平主应力范围为72~88 MPa,从研究区中心向西南、东北两侧逐渐递增;考虑耦合作用后,研究区最大水平主应力范围为84~102 MPa,最小水平主应力范围为76~91 MPa,最大及最小水平主应力增加。渗流-应力耦合作用后,研究区裂缝发育指数分布在0.027~1.156之间,山头顶部和近东西向断层的内部区域裂缝发育指数在0.7左右,为裂缝较发育区域;而研究区西南和东北边缘区域裂缝发育指数在0.2以下,为裂缝欠发育区域。随着耦合作用时间的增长,储层裂缝发育指数逐渐增大,在注入井和产油井附近区域的裂缝发育指数增大幅度尤为明显;储层裂缝线密度也呈增大趋势,仅产油井周围的裂缝线密度呈现为先减小后增大的趋势;未考虑耦合作用时的储层裂缝参数小于考虑耦合作用后的裂缝参数,说明仅考虑应力场进行储层裂缝预测所得结果偏小。
中文关键词: 储层裂缝  渗流  应力  耦合作用
Abstract:Fracture is an important factor affecting the high and stable yield of reservoir, which lies in a complex geological environment. The formation and development of fractures are influenced by numerous factors; therefore, it is of great significance to study the effect of coupling among factors on reservoir fracture development for guiding petroleum exploration and development. In this study, the effect of seepage-stress coupling on fracture development of Wumishan Formation carbonate reservoir in Well Ren 11 area of Renqiu Oilfield is studied, and the results show that:Without considering the seepage-stress coupling effect, the maximum horizontal principal stress in the study area ranges from 82 MPa to 100 MPa, which gradually increases from southwest to northeast; the minimum horizontal principal stress ranges from 72 MPa to 88 MPa, which gradually increases from the center of the study area to the southwest and northeast. After considering the coupling effect, the maximum horizontal principal stress ranges from 84 MPa to 102 MPa, and the minimum from 76 MPa to 91 MPa. The horizontal principal stress increases after seepage-stress coupling is considered. After the coupling effect, fracture development index of the study area is mainly distributed between 0.027 and 1.156. The fracture development index of the top of the hilltop and the inner area of near the W-E fault is about 0.7, which is a relatively developed area, while the fracture development index of southwest and northeast marginal areas is less than 0.2, which is considered to be an underdeveloped area. With the increase of coupling time, the reservoir fracture development index increases gradually and it increases obviously in the area near the injection well and the oil production well. The fracture linear density of the whole reservoir also shows an increasing trend, only the fracture linear density around the oil production well shows a tendency to decrease first and then increase; The fracture parameters in the reservoir without consideration of coupling effect are smaller than that with consideration, which indicates that the results obtained from fracture prediction only based on stress field are on the small side.
文章编号:     中图分类号:TE319    文献标志码:
基金项目:国家科技重大专项(2016ZX05002-002);国家自然科学基金项目(41272141)
引用文本:
宋子怡,王昊,李静,孙鲁宁,张加太,刘晨.渗流-应力耦合作用对储层裂缝发育的影响研究[J].地质力学学报,2019,25(4):483-491DOI:10.12090/j.issn.1006-6616.2019.25.04.046
SONG Ziyi,WANG Hao,LI Jing,SUN Luning,ZHANG Jiatai,LIU Chen.RESEARCH ON THE INFLUENCE OF THE COUPLING EFFECT OF SEEPAGE AND STRESS ON RESERVOIR FRACTURES[J].,2019,25(4):483-491DOI:10.12090/j.issn.1006-6616.2019.25.04.046

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