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时深调整涉及VSP时深关系和偏移剖面两个方面,因此要弄清时深调整的真正原因,需要对VSP时深关系和偏移剖面及其两者存在的时差进行详细的分析.根据引起VSP时差的不同情况,将钻遇不同地质情况的井划分为水平地层、倾斜地层、断层附近及靠近高速地层四种情况,研究四种不同情况下时深标定中影响时深调整的主控因素,明确了倾斜地层、钻穿断层、靠近高速地层处都会引起VSP时差.在偏移剖面时差分析中,明确了纵向速度拾取不准是引起偏移剖面时差的主控因素.在VSP与偏移剖面时差分析的基础上,制定了不同情况下的时深调整对策,为精细时深标定和中深层储层预测提供了保障和依据.
Time-depth adjustment involves two aspects of the VSP temporal relationship and the offset profile, so a detailed analysis of the VSP time-history and offset profiles and their time differences needs to be made in order to understand the real causes of the time-depth adjustment. Which caused different time lag of VSP. Four wells with different geological conditions were divided into four types: horizontal formation, inclined formation, nearby fault and near high-speed formation. The main control Factor, it is clear that incline strata, drilling through faults and near high-speed formations will cause the VSP jet lag.It is clear from the analysis of jet lag time difference that it is the main controlling factor that causes the jet lag when the inaccuracy of pick- On the basis of time-lapse analysis of displacement profile, time-depth adjustment measures are formulated in different situations, which provide the guarantee and basis for fine time-depth calibration and medium-deep reservoir prediction.