Parameters calculation of borehole trajectory using MWD and well logs as well as the pseudo-dips estimation indicate that real dilling results are quite different from the dilling plans.

• 通过原因分析，包括井眼轨迹参数的对比分析、地层视倾角的确定等，找出了造成该井水平段失误的原因，指出了针对薄储层进行水平井钻井时应该注意的技术事项。