Distributed acoustic sensing (DAS) is a novel technology that uses an optical fiber cable as sensor for signals and can take almost any downhole fiber-optic installation or deployment turn the into large seismic array. This array provide enhanced vertical profile (VSP) imaging monitor fluids pressure changes in hydrocarbon-production reservoir. Walkaway VSP data acquired over formerly producing well northeastern China provided rich set of high-quality DAS walkaway data. A standard...

The production planning optimization for mineral processing is important non-renewable raw resource utilization. This paper presents a nonlinear multiobjective programming model (MPPP) optimizing five indices, including its iron concentrate output, the grade, concentration ratio, metal recovery, and cost. A gradient-based hybrid operator proposed in two evolutionary algorithms named NSGA-II (G-NSGA-II) SPEA2 (G-SPEA2) MPPP optimization. of normalized as strictly convex cone combination...

Quantum key distribution with polarized qubits has not yet been realized over the aerial fiber, due to rapid polarization changes. Here, we report our recent work towards quantum communication through an fiber channel. We designed a fast feedback module featuring high efficiency, speed, and good stability. With this module, implemented long-distance different types of links based on encoding. Our takes significant step application communications in complex environments.

Fiber-optic distributed acoustic sensing (DAS) technology has many outstanding advantages, such as long range, high detection efficiency, wide frequency response, low operation cost, working lifetime, et al. It can be anticipated that DAS great potential to become a next generation of long-distance vibration and wave in the future. However, despite rapid development technology, sensitivity optical cable is still main limitation terms applications technology. In this paper, we propose...

Magnetic anomaly detection (MAD) is an effective method for the of ferromagnetic targets against background magnetic fields. Currently, performance MAD systems mainly limited by geomagnetic noise. Several techniques have been developed to detect target signatures, such as synchronous reference subtraction (SRS) method. In this paper, we propose adaptive coherent noise suppression (ACNS) The proposed capable evaluating and detecting weak signals buried in Tests with real-world recorded show...

Laboratory measurements are described on Permian coals from Wollongong, New South Wales, Australia related to the dependence of ultrasonic P‐ and S‐wave velocities, attenuation, anisotropy dynamic elastic moduli confining pressure, water saturation, pore pressure. Five independent stiffness constants used represent specimens as a function pressure saturation. The is believed be controlled mainly by internal structure coals, while randomly oriented cracks. dispersions were measured...

Lucy MacGregor, Slim Bouchrara, James Tomlinson, Uwe Strecker, Jianping Fan, Xuefeng Ran and Gang Yu argue that a significantly more robust interpretation of rock fluid properties for pre-drill prospect appraisal can be obtained from the resistivity information acquired by controlled source electromagnetic (CSEM) survey if seismic well are incorporated. This is illustrated using case study offshore West Africa, where CSEM dataset was in 2009.

Joint surface and borehole seismic are a 3D surface‐and‐borehole exploration method of the simultaneous acquisition onshore or offshore VSP (vertical profiling) data using same sources. When acquiring 2D in field, simultaneously acquired distributed acoustic sensing DAS‐VSP (Distributed Acoustic Sensing‐Vertical Seismic Profiling) can provide full well high‐resolution structural images around enhance processing significantly. This paper describes imaging from 13 wells jointly with...

During airborne transient electromagnetic (EM) surveys, transmitting and receiving antennas change their attitudes as the inevitable result of pilot maneuvers natural forces, which makes EM response different from that nominal when are straight level. Attitude changes were usually neglected or partially considered in past, not adequate for a quantitative interpretation. In this letter, we first scrutinize mechanism how attitude affects divides these effects into two parts: pure effect...

Recently, 3D assets created via reconstruction and generation have matched the quality of manually crafted assets, highlighting their potential for replacement. However, this is largely unrealized because these always need to be converted meshes industry applications, produced by current mesh extraction methods are significantly inferior Artist-Created Meshes (AMs), i.e., human artists. Specifically, rely on dense faces ignore geometric features, leading inefficiencies, complicated...

ABSTRACT We developed a new marine controlled‐source electromagnetic receiver for detecting methane hydrate zones and oil gas reservoirs on the seafloor, which is not imaged well by seismic reflection surveys. To determine seafloor structure, should have low noise, power consumption, clock drift error, operating costs while being highly reliable. Because no suitable was available in our laboratory, we with these characteristics; equipped acoustic telemetry modem an arm‐folding mechanism to...

Abstract To achieve the economic and effective development of shale gas, it is not only necessary to determine favourable geological areas but also pay more attention engineering areas. Geologically are measured on their total organic carbon (TOC) content, thickness high-quality fractures, assessed brittleness in most cases fractures occur both The Zhao104 well located Sichuan Basin China, Longmaxi (LMX) Formation, has an abundant gas content based drilling log interpretation. It clarify...

Distributed Acoustic Sensor (DAS) is increasingly recognized as a viable alternative to downhole geophone arrays for the acquisition of borehole seismic (VSP – Vertical Seismic Profile) or DAS-VSP data. When acquiring surface data in field, simultaneously acquired an available well wells can provide full VSP imaging and significantly enhance processing. Borehole higher resolution structural images around receivers are located inside near reservoir. In addition, formation velocity,...

Summary The world largest 3D DAS-VSP survey through the joint OBN and data acquisition project in Middle East was completed 2022. By using airgun sources of an ongoing high-density project, were acquired simultaneously a total 13 wells. All wells have armored optical cable preinstalled outside production or injection tubing strapped on with clampers at 10 m spacing. processing workflow includes deblending, noise removing, first break picking, VSP FWI to invert velocity model least-squares...

Monitoring the advancement of flood from water injection in carbonate reservoirs is a major challenge<br>for geophysical methods. 4D seismic has limited applicability to Middle East with low gas-oilratio<br>in rocks. On other hand, electromagnetic (EM) methods hold largest potential in<br>such due large resistivity contrast (over one order magnitude) between oilsaturated<br>and water-saturated reservoir Electromagnetic measurements, however, are noise<br>sensitive thus special configurations...

We have developed the joint source scanning algorithm (JSSA) to determine locations and focal mechanisms (FMs) of microseismic events simultaneously. However, computational expense using JSSA is too high meet requirements real-time monitoring in industrial production. several schemas reduce computation time. A multistage schema can significantly improve efficiency while retaining accuracy. For optimized inversion method, a series tests has been carried out actual field data synthetic...

Distributed fiber optic sensing is increasingly recognized as a viable alternative to geophone arrays for the acquisition of borehole seismic data. The ability acquire data in without need disrupt production also offers significant benefits operator. A novel distributed acoustic sensor (DAS) with ultra-high sensitivity presented. Through designing and fabricating micro-structured optical (DMOF) successive longitudinal microstructures enhance signal-to-noise ratio (SNR) backscattered light,...