地震及电法分布式混合采集站的关键技术研究

As deep geophysical prospecting develops greatly, the single geophysical prospecting method hasn’t been able to meet the demand of prospecting work in China, and multi-method united prospecting has become the research hotspot currently. The study on seismic and electric method joint inversion technology has started. However, the study on the front end integrated blended acquisition technology is nearly neglected by the entire world, and is to be further studied. The main differences of seismic and electric method data acquisition instrument lie on front-end sensor and front-end analog circuit. The subsequent high precision analog-digital conversion, high precision synchronization and high speed data transmission are common. This project plans to design a high-precision △-Σ analog-digital conversion chip facing seismic and electric prospecting with intellectual property right. The design is compatible for acquisition circuits of two prospecting methods, deeply studies high-precision synchronous and low-power dissipation high-speed data transmission technology, and integrates, optimizes and forms seismic and electric method distributed blended acquisition station to provide solutions for the research of high density, high precision, light and high efficient seismic and electric distributed blended acquisition system. The study achievements are expected to promote the in-depth study of seismic and electric method blended acquisition technology in China, provide powerful equipment support for progressive development of seismic and electric joint prospecting technology, and expand new ideas for multi-method joint prospecting.

随着深部地球物理探测工作的大量开展，仅仅依靠单一地球物理勘探方法已无法满足我国勘探工作的需求，多方法联合勘探已成为当前研究热点。地震及电法联合反演技术的研究已起步，但其前端的一体化混合采集技术的研究几乎被全世界所忽视，有待于进一步深入研究。地震与电法的数据采集仪器主要不同点在于前端传感器和前端模拟电路，而后续的高精度模数转换、高精度同步、高速数传等方面存在众多的共同点。项目拟通过设计一款具有自主知识产权的面向地震及电法勘探的高精度△-Σ型模数转换芯片，设计兼容两种勘探方法的采集电路，深入研究高精度同步及低功耗高速数传等关键技术，整合并优化形成地震及电法分布式混合采集站，为研制高密度、高精度、轻便、高效的地震及电法分布式混合的精细化勘探采集系统提供解决方案。研究成果有望推动我国地震及电法混合采集技术的深入研究，为地震及电法联合勘探技术向前发展提供强有力的装备支撑，为多方法联合勘探开拓新思路。

随着深部地球物理探测工作的广泛开展，单一地球物理勘探方法已无法满足我国勘探工作的需求，多方法联合勘探已成为当前研究热点。本项目以装备需求为导向，进行了多级级联∑-△调制器的基本原理以及电路结构研究，自主设计实现了一款高精度级联型Σ-Δ调制器；完成了高精度地震及电磁采集站研制；开展了地震及电法采集站有线、无线分布式混合组网及高速数传技术研究。经过大量室内测试及野外试验验证，本项目研究的地震及电法分布式混合采集站具有多功能、高精度、大动态范围的采集特点。依靠自主研发的有线、无线混合式组网技术，能够最大程度发挥分布式采集站布设灵活的特点，同时兼顾系统远距离实时数传要求，为野外地震电法联合采集提供极大的便利，同时为后续地震电法联合反演提供有力的装备支撑，进一步提升了地球物理探测精细化水平。本项目历时四年，所研究的软硬件成果中部分现已转化为分布式无线微震压裂监测系统并投入市场使用。截至目前，本项目已按照研究计划和预期成果圆满完成了既定的科研任务，并以此为依据进一步确立了未来的发展方向及研究目标。