For Shale Gas Exploration In The Development Of Microseismic Data Acquisition Recorder

Along with the deepening of economic globalization, the demand for energy is growing for all the world in recent years. Therefore, finding and developing new energy sources has increasingly drawn people’s attention. As a new clean and strategic resource, the exploration and development of shale gas gain a worldwide attention. However, shale gas’s characteristics of low porosity and low permeability makes the production process hard. Most of the shale gas need to be fractured in order to get a good yield. Hence, how to effectively monitor and evaluate the effect of the fracture is vital to fracturing stimulation.This topic is one of the key research of Qingdao strategic cultivating emerging industries plan in the field of micro-seismic monitoring of advanced manufacturing technology. Core mission is to develop high bandwidth weak signal acquisition recorders for ground surveillance technology of micro-seismic events and high-precision clock synchronization and real-time transmission of information processing technology for micro-seismic monitoring system, providing equipment foundation for monitoring micro-seismic in shale gas exploration and development with a low cost.The topic for the development of shale gas exploration in micoseismic acquisition recording is a smart equipment with mechanical design, computer technology, detection technology, communications technology. Acquisition recorder along with customized high-precision large resolution geophone can work independently to form a microseismic monitoring system nodes. Acquisition recorder while carrying a weak signal amplification, A/D converter data acquisition, GPS receiver, WIFI modules, wired Ethernet modules, under the control of the main controller to achieve a micro-seismic signal amplification, processing, collection, storage, uploading a series of work.This paper describes the design and development process for microseismic shale gas exploration and acquisition recorder. Micro-seismic monitoring of hydraulic fracturing as the background, a detailed study of the properties of micro-seismic signals, fracturing and monitoring the impact brought about by differences in the way. Expand research collection logger for these characteristics. This paper presents a complete set of ground monitoring system solutions, while the development of a single node to complete the acquisition recording system.Microseismic acquisition recorder includes digital master control unit, a weak signal acquisition and processing unit and geophone. Where in the digital control unit uses "ARM+FPGA" architecture to ARM microcontrollers as the main control platform, the process responsible for the operation and management system. Using FPGA technology to complete the work of the high-speed large-capacity data collection; the weak signal acquisition and processing unit selected 32-bit high-precision ADC, to achieve a high-resolution large dynamic range of data collection. Geophone choose customized SN4G series of new high-sensitivity detector, to ensure that the microseismic data acquisition signal quality, to improve data collection accuracy and high reliability has laid a good foundation.This paper introduces the principle of micro-seismic monitoring, planning and design of the overall program, the system hardware design, FPGA logic design and system planning and design software.