砂泥岩薄互层电阻率准确测量是提高泥质砂岩储层计算的一项重要工作.为了解决薄互层电阻率准确测量问题,该文提出一种三维感应成像测井仪的设计与实现方法.首先,基于感应电磁测量方法,设计由1个三轴发射器、4个单轴接收阵列和3个三轴的接收阵列组成的三维探测器.在此基础上,通过三维线圈系参数与结构创新设计、多频循环发射、高精度多道同步采集、高性能发射接收一体化集成等技术实现,在每一个深度点可获取78个电导率测量值.最后,利用数据校正与处理技术来消除各种环境影响,经过理论模型和实际资料的处理结果均证实,该仪器处理得到5条不同径向探测深度的水平电阻率与垂向电阻率、地层倾角等曲线,实现了对薄互层电阻率的准确测量.

By using the integrated circuit design concept,the miniaturization processing of the MIT's multi frequency and multi-channel weak signal's preamplifier and band pass filter is realized.The miniaturization preprocessing circuit (preamplifier and band-pass filter circuit)has a small PCB size,simple structure,high signal-to-noise ratio,reliable temperature performance,convenient debugging and maintenance.The paper focuses on describing the circuit design,calculation and reality about the preamplifier and band-pass filtering processing,and single board test at room temperature and high temperature,separation device compared with integrated chip circuit board,etc.The realization of the miniaturization circuit board is of high reference value for logging instrument pretreatment.

地层特性通常有很强的方位性,因此,必须进行三维测量才能提供完整的描述.三维声波,能提供轴向、周向、径向三个方向上的测井数据.轴向、周向的探测分辨率进一步提高,能更精细地描述近井眼地层信息;径向探测深度的提高,能更好地获取原状地层信息,在能为取心、射孔提供更准确依据的同时,还能有效地判断出地层断面及裂缝发育走向,并且也为声波过套管测井提供了可行性依据.

Crosswell seismic,as a bridge between logging data and seismic data,which improves the comprehensive interpretation,and allows us to have reliable data to support interpretation on any scale.However,whether domestic or foreign,crosswell seismic equipment,especially the source,is still the bottleneck of crosswell seismic technology.If the stimulative performance of seismic source fails to meet requirements,the collected data cannot be a true reflection of the measured formation information,measurement would be meaningless.The characteristic analysis of seismic source recent in high frequency uses is done,in order to select suitable source in the next work.

There are many source rocks developed at South Poyang Depression, mainly including the Upper Permian Longtan Formation of dead color mudstone and coal, the Lower Permian Maokou Formation of marl and the Lower Permian Xixia Formation of limestone. Integrated barkinite and vitrinite in coal, a hydrocarbon-generating simulation was carried out and a hydrocarbon-generating potential was explored for the main source rocks in this study area. These results illustrate that either barkinite or vitrinite are of very strong potential, in which an oil generation of barkinite is much stronger than that of vitrinite. As for Maokou and Longtan formations, a hydrocarbon-generating intensity in mud source rock shows that the maximum occurs at southwestern depression and a decrease trend appears from north to east. Additionally, the thickness of source rock at southwestern depression is the largest, reflecting the southwestern depression is a favorable exploration area.