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《Computing Techniques for Geophysical and Geochemical Exploration》 2009-03
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RESEARCH ON INTERLAYER KARSTIFICATION PATTERN IN WELL TZ82 REGION

LIU Wei-fang1, LUO Chun-shu2, GAO Jian-hu1, et al.(1.Research Institute of Petroleum Exploration and Development-Northwest,PetroChina,Lanzhou 730020,China; 2.Research Institute of Exploration and Development of Tarim Oilfield Company,Kuerlei 841000,China)  
Reservoir prediction research in grain limestone shows that there are seismic waveform anomaly between grain limestone and overlaying shale strip. The results of Carbon-oxygen isotopic analysis indicate that reservoir in well Tz82 region is under seawater and buried diagenesis condition. In the process of thermal evolution,a great deal of organic matter in shale strip developed into organic matter carbon dioxide and organic acid which resulted in weak acid and alkalescence formation water based on the analysis of formation water data, and acid formation water dissolved the top of grain-stone because of buried diagenesis, which resulted in the layer distribution of karstification in the top of grain limestone in well Tz82 region. This is possibly a new type of reservoir and this type of reservoir can be confirmed by core and rock thin-section analysis. This interlayer karstification pattern on top of grain limestone will bring the new exploration results of well Tz82 region because its wide distribution and the good association of reservoir and sealing though the thickness is thin.
【Fund】: 国家973项目(2007CB209604/2007CB209608)
【CateGory Index】: P618.13
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