A new paradigm for hybrid reliability-based design optimization (HRBDO) is proposed. The key innovation lies in expanding the traditional β-circle into a β-cylinder along interval dimensions, integrating both random and dimensional information. Building upon this theoretical foundation, novel interval-based expansion active learning (IBAL) method proposed, transforming complex double-loop reliability calculation an efficient single-loop process. employs Kriging models to replace expensive...

Abstract Fractures play a vital role in reservoir transformation, but the distribution of faults and fractures is difficult to obtain by observing cores, which ultimately limits effective development gas dolomite reservoirs. We propose an integrated method that incorporates thin-section observations, three-dimensional (3D) seismic data, image logs interpret Cambrian Longwangmiao Carbonate Formation predict potential areas Moxi-Gaoshiti area Sichuan Basin, South China. Firstly, were well...

Abstract Objective In this study, we investigated the impact of perioperative administration Bifidobacterium triplex viable capsules on serum levels circulating miR-21-5p, miR-135-5p, and miR-155-5p in patients with colorectal cancer (CRC). The purpose study is to provide a foundation for future research use enhance postoperative recovery CRC. Methods A total 60 primary CRC admitted Department General Surgery at Shanxi Bethune Hospital between June 2020 December were selected randomly...

Seismic fluid identification is the main goal of current prestack seismic inversion. Various kinds indicators are used for detection in industry today. However, existing methods cannot always provide reliable prediction owing to insensitivity response and lack converted wave constraints. The equivalent bulk modulus an effective factor based on matrix-fluid decoupling, which can persuasive evidence detection. Combining poroelasticity theory decoupling theory, we have deduced a new PS-wave...

The enrichment of organic matter is the foundation for a high-quality shale deposition. It generally believed that high productivity and persistent anoxic conditions facilitate preservation matter. However, there lack investigation into how dynamic combination anoxia affects enrichment. Here, black shales Wufeng Formation Longmaxi in western Chongqing area were selected, where oceanic evolved as function water depth. main findings follows: (1) distribution Upper Ordovician Lower Silurian...

ABSTRACT A novel approach of unconventional reservoir stress evaluation is proposed to enhance the accuracy fracture development prediction. Differential horizontal ratio can reflect characteristic fractured reservoir. To calculate differential more intuitionistic and simpler, we re‐derive its formula with Poisson's density. Meanwhile, a new azimuthal PP‐wave amplitude versus offset equation based on density was derived for inverting above elastic parameters directly. Therefore, two steps...

Summary Seismic reservoir fluid identification is the main goal of current pre-stack seismic inversion. Effective bulk modulus an effective factor which can provide persuasive evidence for identification. Under theory poro-elasticity, we deduced a PS wave linear AVO approximation equation based on modulus, dry rock matrix term, porosity and density. And tested accuracy new derived by using typical model. According to joint PP-PS inversion, method seismology real logging well data comparing...

Summary We proposed a new approach for stress prediction and evaluation of heterogeneous reservoir. New azimuthal P wave equation in form Young’s modulus, Poisson’s ratio crack density Differential Horizontal Stress Ratio (DHSR) formula expressed by which reflects the reservoir property were derived. Then, pre-stack angle gathers different azimuth applied to execute AVAZ inversion elastic parameters density. utilized inverted estimate DHSR. The real data application showed that predicted...

A new inversion approach is proposed to enhance the seismic resolution and describe thin-layer karst reservoir property. It can overcome disadvantage of conventional Constrained Sparse Spike Inversion through considering influence sedimentary environment which be characterized by waveform similarity. An integrated workflow established execute process includes well-seismic tie, horizon interpretation, forward modelling, clustering high-resolution inversion. The case study demonstrates...

The paper porposed the Differential Horizontal Stress Ratio (DHSR) evaluate stress property for tight gas reservoir using Poisson's ratio and fracture density. First of all, seismic processing base on Offset Vector Tile (OVT) was executed. Then, we established a new rock physics model by considering pore un-connectedness anisotropy. Finally, azimuthal AVO direct inversion used to obtain density DHSR can estimated above two parameters. example data application revealed that fit with well log...

Summary As development of seismic exploration technology, fluid identification has attenched many geophysists' interest. Howerver, there is an challenge for detecion that the accurancy inversion can not meet demand inversion. To conquer problem, we proposed a new direct method based on joint PP and PS waves. Under direction Russell approximation theory, deduced converted wave approximate reflection coefficient Gassmann item f. Then two-layer model (different lithology) was established to...

Summary A novel method for Total Organic Carbon (TOC) content prediction was proposed utilizing pre-stack elastic impedance inversion. First of all, a new rock physics model established considering mineral compositions, pore type and fluid according to the property experiment shale gas core sample. S wave velocity curve estimated by modelling parameters were calculated P velocity, density. Then, super gather pre-processed obtaining high quality angle gather. We derived density through...

Summary As development of oil/gas exploration, special reservoirs like fracture reservoir attract more and explorers' attentions. Therefore, this paper proposed an algorithm joint inversion azimuthal PP PS wave EI to obtain elastic anisotropy parameters (ε(V), δ(V) γ) under the direction PP-PS AVO inversion. First, new compressional converted azimuth approximation equations in form P impedance (Ip), S (Is) were deduced. Meanwhile, we derived (EI) (PSEI) on foundation equations. Then, was...

As an important seismic method for the characterization of fracture orientation and density, azimuthal P-wave anisotropic inversion is essentially dominated by signal to noise ratio (SNR) CRP gathers azimuth distribution. known all, higher SNR is, more accurate AVAZ results are. In addition, distribution schemes input gathers, including width, center number, substantially affect efficiency precision. this paper, numerical model with different scheme designed study influence on inversion. It...

Reservoir classification and evaluation based on reliable detailed exploration results, such as elastic or physical parameters of target strata, aims at helping us choosing the best reservoirs, sweep spots oil gas, meanwhile reducing risks. But due to complexities ambiguities geophysical data, ordinary automatic clustering methods usually obtain unstable too much human intervention also leads low resolution, subjectivities randomness. In this paper, we introduce a peaks-density distance...

Histogram equalization can be used in improving image contrast and emphasizing some interesting areas to users, while remain the relative relationship of pixels. Using this method, we succeeded reservoir characteristics such as faults, fractures channels. More over, proposed a new multi-scaled fault detection method. So histogram could promising tool research prediction.

Abstract Combining the equivalent fractured media with Thomsen theory, anisotropic parameters expressed in compliance are obtained. The new PS wave reflection coefficient formula presented matrix porosity, fluid type, and fracture density were established. Numerical simulations show that water-saturated is more sensitive to than gas-saturated media; difference between coefficients state greatly increases when porosity of exceeds 0.01. It shows can be used as good indicators reservoir.

Estimating sensitive parameters of fractured sweet spots such as effective stress and fracture properties from azimuthal seismic amplitude data can be useful to optimize development shale-gas reservoirs. Based on anisotropic Gassmann's equation the relationship between porosity stress, we propose a simplified expression saturated stiffness tensor in terms exponential weaknesses for an HTI model formed by single rotationally symmetric set vertical fractures. Using perturbation matrix, derive...