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    郭惠, 赵红格, 陈江萌, 邵晓州, 刘池阳, 王建强, 雷琳琳, 李俊, 汪建, 黄雷. 鄂尔多斯盆地西部古峰庄地区三叠系延长组裂缝特征及其对低渗透油藏的控制作用[J]. 中国地质.
    引用本文: 郭惠, 赵红格, 陈江萌, 邵晓州, 刘池阳, 王建强, 雷琳琳, 李俊, 汪建, 黄雷. 鄂尔多斯盆地西部古峰庄地区三叠系延长组裂缝特征及其对低渗透油藏的控制作用[J]. 中国地质.
    GUO Hui, ZHANG Hongge, CHEN Jiangmeng, SHAO Xiaozhou, LIU Chiyang, WANG Jianqiang, LEI Linlin, LI Jun, WANG Jian, HUANG Lei. Fracture characteristics of Triassic Yanchang Formation in Gufengzhuang Area, Western Ordos Basin, and its control on low permeability reservoirs[J]. GEOLOGY IN CHINA.
    Citation: GUO Hui, ZHANG Hongge, CHEN Jiangmeng, SHAO Xiaozhou, LIU Chiyang, WANG Jianqiang, LEI Linlin, LI Jun, WANG Jian, HUANG Lei. Fracture characteristics of Triassic Yanchang Formation in Gufengzhuang Area, Western Ordos Basin, and its control on low permeability reservoirs[J]. GEOLOGY IN CHINA.

    鄂尔多斯盆地西部古峰庄地区三叠系延长组裂缝特征及其对低渗透油藏的控制作用

    Fracture characteristics of Triassic Yanchang Formation in Gufengzhuang Area, Western Ordos Basin, and its control on low permeability reservoirs

    • 摘要:研究目的】古峰庄地区三叠系延长组属于低渗透储层且天然裂缝较为发育,以往对其裂缝特征研究较少,因此开展天然裂缝特征和形成时期研究对低渗透油藏勘探开发具有重要作用。【研究方法】本文通过野外露头、岩心、成像测井、扫描电镜、流体包裹体及断裂活动和构造应力等方法,对古峰庄地区延长组天然裂缝的特征、形成期次与成因进行研究,并探讨了裂缝对低渗透油藏的作用。【研究结果】研究表明,延长组各段天然裂缝均发育,以长7段最为发育,其次为长8、长6段;裂缝以高角度裂缝和垂直裂缝为主,走向以NEE向为主,NE向次之,少量NW和NWW向;裂缝面可见方解石充填和明显过油痕迹。天然裂缝发育特征与岩层厚度、断裂活动密切相关。裂缝形成时期具有多期性,主要为燕山期和喜马拉雅期。【结论】天然裂缝的发育改善了研究区低渗透储层的孔渗能力和储集空间,为低渗透油藏近源、短距离运移、储集和富集提供了良好条件,其发育程度与形成时期影响着低渗透油藏的成藏和产能。

       

      Abstract: Objective The Triassic Yanchang Formation in Gufengzhuang area belongs to the low permeability reservoir with natural fractures, but in the past, there were few studies on its fracture characteristics. Therefore, it is of great significance for the exploration and development of low permeability reservoirs to study the characteristics and formation period of natural fractures.Methods In this paper, by means of outcrop, core, imaging logging, scanning electron microscope, fluid inclusion, fault activity and tectonic stress, the characteristics, formation stages and causes of natural fractures in Yanchang Formation in Gufengzhuang area are studied, and the influence of fractures on low permeability reservoirs is discussed.Results The research shows that natural fractures are all developed in each Member of Yanchang Formation, with Chang 7 being the most developed Member, followed by Chang 8 and Chang 6 Members. The fracture strike is mainly in NEE direction, followed by NE direction, and a few NW and NWW directions. Calcite filling and obvious oil marks can be seen on the surface of the crack. Natural fractures are closely related to the thickness of rock strata, fault activity and so on. Comprehensive analysis of fracture inclusions, faults and tectonic activities shows that the formation period of fractures is multi-stage, mainly in Yanshanian and Himalayan periods.Conclusions The development of natural fractures has improved the porosity and permeability and reservoir space of low-permeability reservoirs in the study area, and provided favorable conditions for the near source, short-distance migration, reservoir accumulation and enrichment of low-permeability reservoirs. The development degree and formation period of natural fractures affect the reservoir formation and productivity of low-permeability reservoirs.

       

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