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《Progress in Geophysics》 2019-01
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Method of resistivity curve fitting sonic curve in LD10 high temperature and high pressure gas reservoir

ZHANG Liang;DENG Hai-dong;DENG Yong;LIAO Yi;CHEN Ke-lin;Zhanjiang Branch of CNOOC Limited,Zhanjiang;  
After years of investment,the Yinggehai basin has been gradually developed from the shallow exploration under normal temperature and pressure into deep exploration under high temperature and high pressure.In 2015,two wells named W1\W2 were drilled in LD10 target area of the Yinggehai Basin deep, proved that the target layer is high quality gas bearing sandstone. However,with the influence of high temperature and high pressure influence, the test requirements of drilling engineering are seriously restricted, and the sonic logging curves are not detected in the target beds in two wells. Therefore, it is impossible for us to obtain the time-depth relationship accurately by well-seismic calibration, and now we are in dispute about whether the seismic response of the gas reservoir in the target layer under high temperature and high pressure is the peak or the trough. Macroscopically, the velocity distribution law of LD10 area discovered that the resistivity,velocity and pressure of the LD10 zone are related to the mudstone undercompaction. On this basis we established the technical route of resistivity fitting sonic curve. We use the resistivity curves of W1 and W2 to obtain the sonic curve of the target layer, and then the well-seismic calibration is completed by using this sonic curve. Well seismic calibration results show that the matching degree of well seismic is high. It is proved with the influence of high temperature and high pressure that the seismic response of top of gas reservoir is peak.Compared with traditional gas reservoir with low velocity and low density, the seismic response of the top surface is trough. The results of this study provide guidance for further drilling in LD10 area, and the subsequent drilling proved that the method of resistivity curve fitting sonic curve is reasonable and reliable.
【Fund】: 中海石油有限公司科研项目“莺歌海盆地模糊区成像处理关键技术研究”(YXKY-2018-ZJ-01)资助
【CateGory Index】: P631.322;P618.13
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