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《Chinese Journal of Geophysics》 2001-03
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APPLICATION RESEARCH OF CROSSHOLE ELECTROMAGNETIC TOMOGRAPHY

ZENG WEN CHONG\ ZHAO WEN JIE\ ZANG DE FU (Shengli Petroleum Administration Bureau, Dongying 257061, China)  
The main technological objective of crosshole EM tomography is to realize direct electrical measurements between wells and acquire 2D or 3D resistivity images reflecting hydrocarbon and water distribution between wells. A co operation and joint study between Shengli Oilfield of China and EMI Company of USA for the application method of crosshole EM system has being gone on since 1997. The cooperation comprises of the following aspects: to examine further the performance of the tools and explicit improvement direction, to analyse the adaptability and the feasibility to reservoir research through large scale and systematic field tests in the condition of large well separation, to accelerate the development of processing and interpretation method and its software based on systematic field data to carry on systematic tests in steel cased boreholes and explore the imaging method of resistivity in the condition of steel casing. In November 1998, June and July 1999, large scale industrial field tests with 10 measurements in 3 pairs wells were successfully conducted in the low resistivity profile in Shengli Oilfield. Firstly, the formation is of typical low resistivity profile with the background resistivity of 1.5—2.0Ωm. The attenuation of the EM energy in the formation is very serious. Secondly, the field tests were conducted systematically passing through one and two steel casing. The desired goals were achieved in the three tests. Not only is the performance of the tools proved to be stable and reliable, but also complete crosshole EM data with good repeatability and accuracy were acquired for the first time in the world between the wells with the separation of 434m of open hole to open hole and 150m of open hole to casing hole. The resistivity images derived from the data inversion shows good geological results in the analysis of hydrocarbon distribution and reservoir recovery states between wells.
【Fund】: 中国石油化工集团总公司基金!(KZD2 1 9970 0 7)
【CateGory Index】: P631.8
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