The static shift effect is a distortion in electromagnetic data that severely impacts exploration results. Traditional correction methods are often ineffective, prone to overcorrection or undercorrection, and make it difficult accurately assess the applicability of correction. Furthermore, some processes require additional data, which increases costs. This paper first presents theoretical foundation for correcting effects electric field components using magnetic component information. Based...

In response to the problems of low efficiency and safety hazards in traditional subsea pipeline intersection isolation release operations, this study designs a new type automatic deployment device for oil gas isolation, aimed at replacing manual unmanned underwater vehicles (ROVs) monitoring. The adopts an innovative framework structure design, significantly improving its resistance water flow, enhancing operability accuracy operations through ducted propeller propulsion system. This used...

Three-dimensional (3-D) magnetic inversion is an essential technique for revealing the distribution of subsurface magnetization structures. Conventional methods are often time-consuming and suffer from ambiguity due to limited observations non-uniqueness. To address these limitations, we propose a novel method under machine learning framework. First, design training sample generation space by extracting horizontal positions sources analytic signal amplitude reduced-to-the-pole anomalies...

We developed ACMT (attitude correction for the Marine Controlled Source Electromagnetic Method transmitter), a deep learning algorithm based on transformer modeling and modal fusion. This model utilizes motion sensor data to correct attitude effects in towed MCSEM transmitters. To train ACMT, we computed forward responses 2,000 combinations of randomly modeled reservoirs transmitter attitudes, using corresponding attitude-free as training labels. demonstrated robust performance test set,...

Remarkable progress has been made in electromagnetic (EM) techniques as applied to the petroleum industry instruments, data acquisition, and processing interpretation China. Included here is equipment, such high-power Controlled Source EM (CSEM) acquisition systems, methods, three dimensional small-bin Continuous Electromagnetic Array method, Time Frequency Domain Electromagnetic, Borehole-to-surface technique marine magnetotelluric method. Data fast inversion using nonlinear conjugate...

As oil exploration becomes more mature and remaining targets are better concealed and/or complicated, it important to determine the oil-bearing extent of known reservoirs their relationship with adjacent rocks. Thus, there is a need for method precisely distribution boundary reservoir during field development.

Abstract The first Borehole to Surface Electromagnetic (BSEM) pilot field survey in the Kingdom of Saudi Arabia (KSA) was successfully executed identify oil and water bearing reservoir layers a carbonate oilfield injection zone. Maximizing recovery factor by means detailed mapping hydrocarbon accumulations reservoirs is key requirement for producing companies. This done routinely accurate measurements fluid distribution at wells’ locations, but knowledge gap exists inter-well volumes, where...

The electrical resistivity method is widely used in near-surface mineral exploration. At present, the deterministic algorithm commonly employed three-dimensional (3-D) inversion to obtain subsurface structures. However, accuracy and efficiency of rely on initial model. In practice, obtaining an model that approximates true structures remains challenging. To address this issue, we introduce a broad learning (BL) network determine utilize limited memory quasi-Newton (L-BFGS) conduct 3-D task....

Monitoring and detecting buried pipelines under concrete pavement are often complex difficult tasks. The time–frequency electromagnetic technology, with the fast information acquisition strong anti-interference ability, is first applied in pipeline inspection. purpose to verify if this method can monitor detect status change effectively, even covered by pavement. Three representative scenarios (normal, coating-damaged leaking) two types of (plain reinforced concrete) created simulations...

With processor speed doubling every 18 months, more and system functionalities are implemented as software (SW) in the design process of embedded systems. Selecting "right" RTOS before SW is developed very important. In this paper, we present an modeling tool based on SystemC. It configurable to support timed simulation most popular RTOSs. Timing fidelity achieved by using delay annotation. The OS timing information derived from published benchmark data. Experiments show that accuracy our...

In Sanfu, Qaidam basin, China, traditional geophysical methods have failed to find subtle hydrocarbon reservoirs. an attempt predict and delineate gas reservoirs, we used a type of magnetotelluric (MT) profiling called 3D continuous electromagnetic (CEMP). Electric logs indicate that gas-bearing formations high resistivity relative nongas-bearing formations. Obvious anomalies derived from MT sounding curves are interpreted come formations; observed no such anomalous away For CEMP, five...

We have performed a case study on the use of magnetic amplitude inversion in imaging volcanic rocks that are buried sedimentary basin and strong remanent magnetization. The application arises exploration for natural gas hosted environments. weak anomaly associated with units presence magnetization therein pose major challenges interpretation. first Wiener filter based an ensemble analysis to examine depth characteristics anomalies, then we inversion-based signal separation extract final...

The exploration of podiform chromites in the Indus Yarlong Zangbo suture zone southern Tibet has proved difficult because most known deposits pinch out and then reappear same direction. Several ground-based geophysical approaches such as gravity, magnetic, controlled-source audio-frequency magnetotelluric (CSAMT) methods have been applied to explore for these chromite but mostly failed delineate prospective areas. We evaluated a successful case history that is based on AMT. More than 8000...

The first Borehole to Surface Electromagnetic (BSEM) pilot field survey in Saudi Arabia — identify oil and water bearing reservoir layers an oilfield injection transition zone was successfully completed. objective of a BSEM is obtain resistivity induced polarization (IP) maps based on acquisition grid at the surface that covers few kilometers around transmitter well. reveals zones investigated layers. In this test, showed potential map water-front movements, area about 4 km from single well...

We have carried out a field trial of time-lapse continuous electromagnetic profile (CEMP) method for monitoring gas reservoir development. Several data acquisition methods were tested to establish field-worthy practical procedure that maintained the consistency CEMP and ensured reliability collected data. An effective denoising static correction algorithm has also been developed sufficiently suppress noise disturbance processing purposes. The resistivity variation with time was recovered...

A successful case history of applying the high-frequency passive source electromagnetic (EM) method and controlled-source audiomagnetotellurics (CSAMT) to investigate Qiyueshan (Q) Tunnel route is presented in this paper. The EM system (EH-4, with frequency range from [Formula: see text]) CSAMT (V6-A Multipurpose Receiver, were used for data acquisition. orthogonal components field measured high method, while scalar measurements electrical magnetic method. relevant properties earth extracted...

Hydraulic fracturing is widely used for initiating and subsequently propagating fractures in reservoir strata by means of a pressurized fluid to release oil gas or store industry waste. Downhole surface microseismic monitoring commonly characterize the hydraulically induced fractures. However, some cases, downhole can be difficult due limitation imposed boreholes. Surface often faces difficulties acquiring high signal-to-noise ratio data because on-site noise from hydraulic process. Research...

A fast calculated kernel matrix method is coupled with a compressed technique to solve the large-scale gravity forward-modeling problem. This accelerates coefficient computation by reducing arctangent, logarithm, and multiplication functions in prismatic analytical expression. In addition, use of presents significant advantage that it does not require storage redundant matrices, further memory requirements time. Moreover, discrete convolution density executed through 2D Fourier transform...

Gravity data inversion is of critical importance in geophysics, encompassing a range applications, such as the exploration geological resources, identification structures, and detection groundwater resources. This study proposes three-dimensional (3D) machine learning approach to enhance efficiency aforementioned tasks by leveraging gravity data. The mapping relationship between subsurface density structures modeled broad network, distinguished its high training robust modeling capability....

Abstract We propose a nonlinear conjugate gradient algorithm for pseudo‐3‐D MT inversion. The method is selected as the inversion kernel. When calculating sensitivities matrix, instead of computing 3‐D sensitivities, we compute 1‐D sensitivities. Since sensitivity elements non‐stations are zero, which should be non‐negligible values, adopt approximation. update matrix by quasi‐Newton after first Pseudo‐3‐D can save computational time greatly. Inversion results synthetic data set and real...

In China it has become common to integrate several geophysical techniques when exploring for reservoirs in complex geologic areas. Conventional seismic cannot provide a good image below igneous rock, salt domes, and/or and deeply dipping structures, major limitations determining if reservoir trap contains hydrocarbons mapping the range scope of hydrocarbon-bearing reservoir. EM techniques, on other hand, have recently progressed point that they can solve specific E&P problems....

Piezoelectric transducer is a key component of acoustic well-logging tool. Transducers used in tools usually have limited bandwidth, and their dominant frequencies severely drift with drastic change borehole temperature when are working downhole. An appropriate impedance matching necessary to broaden the operating bandwidth improve power output stability emission. In this study, an electrical (EIM) method for piezoelectric proposed based on Butterworth response network theory. The can...

Artificial source and axial dipole are used for time-frequency electromagnetic (TFEM short hereinafter) acquisition. TFEM data in both frequency domains time simultaneously acquired studied. method is based on physical property differences between hydrocarbon-bearing reservoir non-hydrocarbon-bearing host, other words, technique makes use of the characteristic that traps cause resistivity anomaly polarization anomaly, as well sensitive to variation porosity permeability. High-power...