750results about "Earthquake measurement" patented technology

The present invention provides methods and systems for microseismic hydraulic fracture monitoring in real-time. The methods and systems of the present invention may include continuous map migration of recorded microseismic signals. The methods and systems provide robust automated simultaneous detection and location of microseismic events.

A system and method monitor a hydrocarbon reservoir for drainage in volumetric three dimensions. Monitoring between wells is imperative for optimum reservoir management and is achieved by mapping the hydrocarbon fluid pathways in a producing reservoir. Unlike conventional 4D or time-lapse reflection seismic imaging systems that use a controlled active seismic source and records reflected seismic energy at receivers, the system and method exploit the minute vibrations, or micro-earthquakes generated in the reservoir layers that are induced by fluid movement. These microseisms are detected as the fluids move in the reservoir.

Disclosed herein is an apparatus for evaluating the safety of a building. The apparatus includes first and second measurement instruments which measure earthquake accelerations of the top and bottom stories, a fast Fourier transform unit which performs fast Fourier transform on the earthquake accelerations, an integration unit which double-integrates the measured earthquake accelerations and creates drift data of the top story and the bottom story, a maximum inter-story drift ratio calculation unit which calculates a maximum inter-story drift ratio, a natural frequency change rate calculation unit which determines a natural frequency of the building, and compares the natural frequency with an ambient natural frequency of the building so as to calculate a natural frequency change rate, and a building safety evaluation unit which compares the maximum inter-story drift ratio and the frequency change rate with preset evaluation criteria and outputs a result of evaluation in the safety of the building.

A system and method for microseismic fracture mapping using seismic source timing measurements for velocity calibration is disclosed. The system may include a seismic source coupled to a wireline and a seismic source trigger, a sensor capable of detecting a first signal from the seismic source trigger, a transmitter coupled to the sensor, capable of transmitting a time value associated with the first signal, a receiver capable of detecting an event generated by the seismic source; and an analyzer capable of calculating a microseismic velocity of the event. In one embodiment, a first signal is transmitted through a wireline to trigger a seismic source. The first signal is detected, and a first time value associated with the first signal is transmitted. An event associated with the seismic source is detected and a second signal associated with the event is transmitted to an analyzer. A microseismic velocity is calibrated based on the time difference between the first time value and a second time value associated with the second signal.

The present invention relates to an alarm system intended to trigger an alarm signal upon deviation from at least one environment-dependent reference predetermined for a specific environment. The alarm system comprises at least one portable unit intended to be placed in said environment, which unit has a size corresponding to a mobile telephone. Each unit comprises a sensor system adapted for detecting different states comprising at least vibrations. Furthermore, the alarm system comprises a processor member connected to the sensor system and adapted for the comparison of signals received from the sensor system and said predetermined environment-dependent reference/references. The alarm system further comprises a communication member connected to the processor member and adapted for wireless communication upon, for instance, the triggering of an alarm signal. Furthermore, the alarm system comprises a memory member connected to the processor member via a distributed computer network and adapted for the storage of said predetermined reference/references.

A method of monitoring a microseismic event includes detecting the event to produce a first signal dependent on the event. The first signal includes noise at a frequency of, for example 50 Hz. A first sample of the first signal is taken. Then a second sample of the first signal is taken, the second sample occurring n/f seconds after the first sample, where n is an integer (e.g. 1). Subtracting the first and second samples from each other produces a farther signal dependent on the event in which the noise has been at least partly compensated for.

In a method of critical displacement forecast based on the deformation failure mechanism of slope, a sliding surface displacement, a calculation based on status stability factors and a slope surface displacement are determined, and applied for forecast based on a thrust-type slope deformation mechanism, a key compartment division, a relation between stress and strain mechanics properties of sliding surface of geo-material, and an analysis of evolution characteristics at different points of the sliding surface. The method provides advantages of determining deformation values at different points of a sliding surface, a slope body and a slope surface during slope failures; describing the process of a progressive failure, deformations and force changes of a slope; combining slope monitoring values to perform the stability analysis and the calculation of the magnitude of the stability factors in different deformation statuses of the slope; and assessing the durability of protective measures to the slope.

Novel solutions, which can include devices, systems, methods, than can measure earthquakes and other displacement events. Some solutions feature the integration of real-time, high-rate global navigation satellite system (“GNSS”) displacement information with acceleration and/or velocity data within a single device to create very high-rate displacement records. The mating of these two instruments allows the creation of a new, very high-rate displacement measurement device that has the full-scale displacement characteristics of GNSS and high-precision dynamic motions of seismic technologies. Such a device can be used for earthquake early warning studies and other mission critical applications, such as volcano monitoring, building, bridge and dam monitoring systems.

A method for identifying a seismic event includes extracting a portion of a plurality of seismic data signals based on energy levels in the plurality, comparing the extracted portion to a known pattern and determining a correlation, and identifying the seismic event based on the correlation. A computer program product and devices for implementing the method are provided.

A microseismic method of monitoring fracturing operation or other microseismic events in hydrocarbon wells is described using the steps of obtaining multi-component signal recordings from a single monitoring well in the vicinity of a facture or event; and rotating observed signals such that they become independent of at least one component of the moment tensor representing the source mechanism and performing an inversion of the rotated signals to determine the remaining components.

An object of the invention is to save the trouble of mapping sensor chips on a map information system. A map information management unit 124 is accessed via a network 122. Neighborhood information based on a present position measured by an own position measuring unit 102 is obtained by searching a map DB 127. A sensor information setting unit 106 displays the neighborhood information in a display unit 108. An ID reading unit 104 reads an ID 111 of a sensor chip 110, and registers the ID 111 in the map DB 127 after associating it with equipment information displayed in the display unit 108. The measurement values measured by a sensor 112 are transmitted from an antenna 114 and received by a sensor information receiving unit 119 of the receiver 118. A sensor information communication unit 120 accesses the network 122 and the measurements are transmitted to a sensor information management unit 123. The measurement values are accumulated in a sensor DB 126. The sensor DB 126 is searched using a sensor ID associated in the map DB 127 and the measurements are viewed as map information associated with equipment.

Described herein are embodiments of methods and systems to disconnect utility service based on seismic activity. One aspect comprises a method. One embodiment of a method of disconnecting a utility service based on seismic activity comprises receiving, from a measurement device, an output signal. A level of seismic activity can be determined based on the output signal. If the determined level of seismic activity meets or exceeds a predetermined threshold level of seismic activity, then a disconnect signal is sent to disconnect a utility service from a facility.

The invention relates to a seismic warning system comprising of two or more sensors for detecting shock signals and electronic signal processing elements for processing and analyzing said signals. According to the invention, the system has at least two detection units, each comprising a shock sensor and electronic signal processing elements. The signal processing elements of each detection unit are configured in such a way that they detect the primary waves of earthquakes using the signals of the shock sensors. The detection units are interconnected via an electronic data bus.

A computer implemented method of producing macro-view conclusion data related to a seismic event. The method includes receiving at a processing center a set of data related to a parameter of a seismic event. The parameter is measured using a vibration sensor of a hard disk drive of a computer at a known, fixed location, wherein the vibration sensor produces the set of data. The method further includes processing the set of data at the processing center to produce the macro-view conclusion data. The macro-view conclusion data is then stored in a storage device.

The invention is directed to a system for detecting seismic waves. The system has one or more sensor modules. Each sensor module has a detection unit, a positioning module, a digitizer, a radio transmitter, and a power supply. The system also includes a communications interface including a receiver, a data storage device, and a data relay module, and a data processor. The system may be used to detect seismic events by positioning sensor modules in an area, positioning a communications interface module in an area, establishing communication, polling the sensor modules for data, and relaying the data. The polling and relaying may be repeated at predetermined time intervals. Then, analysis may be performed on the data, and the seismic event may be identified as a precursor.

A seismic switch is a programmable device capable of distinguishing between seismic movements due to an earthquake or an explosion, which is used to send a signal to control panels for security doors. The device uses accelerometers and a microcontroller for the detection and signal analysis of the seismic movements. In the event of an explosion or earthquake, the device produces an alarm.

A microseismic method of monitoring fracturing operation or other passive seismic events in hydrocarbon wells is described using the steps of obtaining multi-component s-wave signals of the event; and using a linear derivative of S-wave arrival times of the signals in a first direction, an S-wave velocity and an s-wave polarization to determine at least two components of the S-wave slowness vector.

The invention provides a sand shale rock reservoir stratum pressure earthquake prediction method and device; the method comprises the following steps: calculating the elastic modulus, the microfissure density and microfissure closed rate factors under the limited effective stress according to a Hashin-Shtrikman boundary model and the porosity and shale content of an object sand shale rock reservoir in a research zone; determining the relation between the dry rock elastic modulus and effective stress according to the elastic modulus, the microfissure density and microfissure closed rate factors; determining the effective stress coefficient of the sand shale rock along with the depth changes according to said relation; predicting the stratum pressure of a single well to-be-detected object layer according to said relation and the effective stress coefficient; using an elastic modulus data body obtained by inversion and taking the single well stratum pressure as constraints, and carrying out three dimensional earthquake stratum pressure prediction on the research zone according to said relation and the effective stress coefficient. The method and device can improve the stratum pressure prediction accuracy.

A wireless node for monitoring landslide conditions has at least one tubular probe body deployed in a borehole in a landslide prone area and anchored to rock below soil, multiple sensors carried by and deployed within and or outside of the tubular probe body for measuring geologic motion and hydrologic saturation and pressure at three or more distinct levels of soil above the rock, a power source, a data acquisition board in communication with the sensors carried by and or deployed within or outside of the probe body, and a wireless transceiver in communication with the data acquisition board and accessible to a local area wireless network (LAWN), which is in turn accessible to a wide area wireless network (WAWN). Geologic and hydrologic data of at least three separate layers of soil above the anchor rock is collected in real time from the sensors deployed on or near the probe body, the data qualified against threshold readings in three or more stages to provide graduating levels of alerts culminating in a warning of an impending landslide.