峰林平原区定井技术研究——以广西来宾峰林平原区为例

通过在广西来宾岩溶干旱区的找水实践 ,将峰林平原区定井技术主要归纳为地质构造方法、蓄水构造方法和综合物探方法。地质构造方法可了解断裂富水带的分布规律 ,以指导寻找各种蓄水构造 ;利用蓄水构造方法归纳出该区 7类岩溶蓄水构造 ,并确定其三维几何形状和内部介质特征 ,为水文物探解释提供地质依据 ;水文物探方法可提供富水地质体的定量、半定量信息。文章认为地质—物探—钻探工作密切配合和交流 ,是提高成井率的保证。     

裸眼井声波全波测井中纵波和斯通利波的数值研究

本文利用射线展开理论、割线积分技术及留数定理,研究了裸眼井声波全波测井中纵波和斯通利波的性质。下面简要说明数值计算方法。 计算方法 考虑在无限大均匀地层中,有一充满流体的深井。在井轴上放一点状声源,则在井轴上离声源距离为z处的声压为     

临夏台分量钻孔应变观测与岷县—漳县6.6级地震的相关性分析

对临夏地震台分量钻孔应变2008—2018年观测数据的可靠性进行了分析,发现S1+S3和S2+S4的年相关系数均值达到了0.98以上;计算的主应力和主方向结果表明:主方向在2013年岷县6.6级地震前存在明显的趋势转折,主应力的变化趋势在去除趋势漂移后,存在先降后升的变化特征,岷县6.6级地震就发生在趋势转变当中。     

Multicomponent observation of crustal activity in the DPRI 800 m borehole close to the Nojima Fault

Abstract An 800 m borehole was drilled near the Nojima Fault, on which a strike–slip larger then 1 m occurred during the 1995 Hyogo-ken Nanbu earthquake ( M = 7.2). Crustal activity near the fault has been observed since May 1996 using a multicomponent instrument installed at the bottom of the borehole. Data of three components of strain, two components of tilt and temperature observed from May 1996 to December 1998 were analyzed. Long-term changes of strain and tilt show a north-east–south-west extension and southwards subsidence. As for the Earth tides and atmospheric effect, orientation of the principal axis of strain was mainly east-west and orientation of the maximum subsidence was mainly north-south. The observational data of strain had variations corresponding to a change in temperature at a depth of 800 m. The thermal expansion coefficient of the crust was calculated to be approximately 2.0 × 10⁻⁶/°K.     

数字式全景钻孔摄像系统及应用

数字式全景钻孔摄像系统是一套全新的智能型勘探设备，代表了钻孔摄像技术的发展方向，它的关键技术在于全景摄像和数字化技术，其中，全景摄像技术解决了三维图像与其空间坐标的关系；数字化技术解决了图像的形成、处理与还原，地质资料的计算、统计与分析，以及二次开发的能力，通过对其基本原理和应用情况的介绍，反映了该系统的科学性、先进性以及其采样技术的完整性、准确性。     

GT－1型工程导向孔多功能无线探测仪和GD－200型钻机在非开挖铺线技术中的应用

介绍ＧＴ－１型工程导向孔多功能无线探测仪的功能、组成参数和ＧＤ－２００型全液压动力头式钻机的组成、性能、主要参数、主要特点以及两者在非开挖铺设管线技术中的配套试验情况。     

水平钻孔中电阻率法测煤厚的原理及正演模拟

论述了顺煤层水平钻孔中电阻率法探测煤层厚度的方法原理，使用线性数字滤波法对不同地电类型做了正演模拟。结果表明，电阻率曲线对煤厚变化反映明显，能探测厚度大于０．８ｍ的煤层。     

Shear-wave anisotropy and the stress field from borehole recordings at 2.5 km depth at Cajon Pass

53 local earthquakes recorded at 2.5 km depth in the Cajon Pass scientific borehole are analysed for shear-wave splitting. The time delays between the split shear waves can be positively identified for 32 of the events. Modelling these observations of polarizations and time delays using genetic algorithms suggests that the anisotropic structure near Cajon Pass has orthorhombic symmetry. The polarization of the shear waves and the inferred strike of the stress-aligned fluid-filled intergranular microcracks and pores suggests that the maximum horizontal compressional stress direction is approximately N13°W. This is consistent with previous results from earthquake source mechanisms and the right-lateral strike-slip motion on the nearby San Andreas Fault, but not with stresses measured within the uppermost 3 km of the borehole. This study suggests that the San Andreas Fault is driven by deeper tectonic stresses and the present understanding of a weak and frictionless San Andreas Fault may need to be modified. The active secondary faulting and folding close to the fault are probably driven by the relatively shallow stress as measured in the 3.5 km deep borehole.     

The Seafloor Borehole Array Seismic System (SEABASS) and VLF ambient noise

The Seafloor Borehole Array Seismic System (SEABASS) has been developed to measure the pressure and threedimensional particle velocity of the VLF sound field (2–50 Hz) below the seafloor in the deep ocean. The system consists of four three-component borehole seismometers (with an optional hydrophone). a borehole digitizing unit, and a seafloor control and recording package. The system can be deployed using a wireline re-entry capability from a conventional research vessel in Deep Sea Drilling Project (DSDP) and Ocean Drilling Project (ODP) boreholes. Data from below the seafloor are acquired either onboard the research vessel via coaxial tether or remotely on the seafloor in a self-contained package. If necessary the data module from the seafloor package can be released independently and recovered on the surface. This paper describes the engineering specifications of SEABASS, the tests that were carried out, and preliminary results from an actual deep sea deployment. VLF ambient noise levels beneath the seafloor acquired on the Low Frequency Acoustic-Seismic Experiment (LFASE) are within 20 dB of levels from previous seafloor borehole seismic experiments and from land borehole measurements. The ambient noise observed on LFASE decreases by up to 12 dB in the upper 100 m of the seafloor in a sedimentary environment.