| Acoustic Borehole Images for Fracture Extraction and Analysis in Second Pre-pilot Drillhole of CCSD |
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| 作者姓名： | Zou Changchun Geo-detection Laboratory China University of Geosciences Ministry of Education Beijing China School of Earth and Space Sciences Peking University Beijing China Shi Ge School of Earth and Space Sciences Peking University Beijing China Pan Lingzhi Geo-detection Laboratory China University of Geosciences Ministry of Education Beijing China |
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| 作者单位： | Zou Changchun Geo-detection Laboratory，China University of Geosciences，Ministry of Education，Beijing 100083，China; School of Earth and Space Sciences，Peking University，Beijing 100871，China Shi Ge School of Earth and Space Sciences，Peking University，Beijing 100871，China Pan Lingzhi Geo-detection Laboratory，China University of Geosciences，Ministry of Education，Beijing 100083，China |
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| 基金项目： | 国家自然科学基金，the Chinese Continental Scientific Drilling (CCSD) Engineering Center |
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| 摘 要： | INTRODUCTIONThesecondpre pilotdrillholeofChineseContinentalScientificDrilling (CCSD PPⅡ)ProjectislocatedintheeastofDabie Suluultra highpressuremetamorphic (UHPM)belt,andthesouthofSuluareainthenorthofMaobeiVil lage ,DonghaiCounty ,JiangsuProvince ,China .PPⅡwasdrilleddownto 10 2 8.6 8mdepthwith 75 .5cmbits ,andcasedatadepthof 6 9.5m .TheinvestigationintodrillcoresrevealsthatPPⅡpenetratesmetamorphicformations .Fivemajorlithologicalunitsareidentifiedasfollows :parag neiss,ortho…
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| 关 键 词： | 超声波 萃取 油气运移 岩石变质 评估 钻孔 |
Acoustic Borehole Images for Fracture Extraction and Analysis in Second Pre-pilot Drillhole of CCSD |
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| Zou Changchun Geo-detection Laboratory,China University of Geosciences,Ministry of Education,Beijing ,China, School of Earth and Space Sciences,Peking University,Beijing ,China Shi Ge School of Earth and Space Sciences,Peking University,Beijing ,China Pan Lingzhi Geo-detection Laboratory,China University of Geosciences,Ministry of Education,Beijing ,China.Acoustic Borehole Images for Fracture Extraction and Analysis in Second Pre-pilot Drillhole of CCSD[J].Journal of China University of Geosciences,2004,15(1):123-127. |
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| Authors: | Zou Changchun SHI Ge Pan Lingzhi |
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| Abstract: | Ultrasonic imaging logging provides continuous and oriented images of structures vs. depth. In the Chinese Continental Scientific Drilling (CCSD) Project, acoustic borehole images were recorded in the second pre-pilot drillhole which penetrates the metamorphic rocks. This paper focuses on fracture evaluation of the drillhole with these images. Both least square fit and a modified Hough transform are used for fracture extraction, and 269 fractures were mapped in the interval from 69.5 to 1 020 m. Most fractures dip steeply, with an average angle of 54°.Fracture dip directions are dominantly in the range of 220°-280° above the depth of 267 m, but 80°-120°in the lower zones. These observations may indicate the differences in structural movements or in-situ stress fields between the upper and lower zones in the drillhole. |
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| Keywords: | Chinese Continental Scientific Drilling (CCSD) acoustic borehole image fracture analysis |
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