基于三维激光扫描的露头天然裂缝识别与发育模式
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(1.中国石油杭州地质研究院,浙江杭州 310023;2.中国石油超深层复杂油气藏勘探开发技术 研发中心,新疆库尔勒 841000;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;4.中国石油青海油田公司勘探开发研究院, 甘肃敦煌 736202)

作者简介:

王珂(1987-),男,高级工程师,博士,研究方向为构造地质学与储层地质学。E-mail:wangk_hz@petrochina.com.cn。

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中图分类号:

:TE 122.2

基金项目:

中国石油天然气股份有限公司基础性前瞻性课题(2023ZZ02);国家自然科学基金企业创新发展联合基金集成项目(U22B600002)


Identification and development model of natural fractures in outcrops based on 3D laser scanning
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(1.PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China;2.R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, China;3. Research Institute of Petroleum Exploration & Development, PetroChina Tarim Oilfield Company, Korla 841000, China;4. Research Institute of Petroleum Exploration & Development, PetroChina Qinghai Oilfield Company, Dunhuang 736202, China)

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    摘要:

    天然裂缝是改善低孔致密储层物性、提高油气产能的重要因素,相似露头天然裂缝的发育模式建立是指导井下裂缝分布预测的有效方法。以库车前陆盆地为例,采用三维激光扫描技术对露头天然裂缝进行识别,并结合人工辅助测量及典型油气藏的实际地质资料,建立背斜型构造的天然裂缝发育模式,并分析天然裂缝的演化过程。结果表明:库车前陆盆地背斜型构造的天然裂缝以高角度缝为主,发育前褶皱期和同褶皱期2期、5类天然裂缝,其中前褶皱期天然裂缝数量少,且多数为无效裂缝,对库车地区油气成藏贡献较低,而同褶皱期天然裂缝数量较多、有效性好,可作为油气高效渗流通道,是库车地区形成裂缝性油气藏的重要地质条件;库车前陆盆地背斜型构造的核部天然裂缝密度比两翼要低,但开度、渗透率和油气产能高于两翼,与典型背斜型油气藏的勘探实践一致;针对三维激光扫描技术天然裂缝识别率有待提高、裂缝开度和充填系数等参数识别困难的问题,还需要寻找可行的方法对该技术进行优化完善。

    Abstract:

    Natural fractures are key factors in improving the quality of low-porosity reservoirs and enhancing petroleum productivity. Establishing natural fracture development models in analogous outcrops is an effective method to guide the prediction of subface fracture distribution.Using the Kuqa foreland basin as an example, a natural fracture development model of anticlinal structures was established by applying 3D laser scanning technology to identify natural fractures, supplemented by manual measurements and geological data from typical petroleum reservoirs. The evolution process of natural fractures was also analyzed. The results show that natural fractures in anticlinal structures of the Kuqa foreland basin are mainly high-angle, and can be classified into two stages (pre-fold and syn-fold) and five types. Pre-fold fractures are few in number and mostly ineffective, thus making only a limited contribution to petroleum accumulation in the basin. By contrast, syn-fold fractures abundant and highly effective, serving as efficient seepage channels for petroleum migration and forming essential geological conditions for fractured petroleum reservoirs in the Kuqa foreland basin. Although the density of natural fractures in the anticline cores is lower than that in the wings, the fracture aperture, permeability, and petroleum productivity are higher, consistent with exploration results from typical anticlinal petroleum reservoirs. Considering the current limitations of 3D laser scanning, such as the need to improve fracture recognition rates and the difficulty in identifying parameters like fracture aperture and filling coefficient, it remains necessary to develop feasible methods to further optimize and refine the technology.

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王珂,张荣虎,李玲,王俊鹏,黄箐璇,曹慧,王丽娟.基于三维激光扫描的露头天然裂缝识别与发育模式[J].,2025,49(5):16-30

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  • 收稿日期:2024-12-30
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  • 在线发布日期: 2025-10-29
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