Open fractures are of interest in many areas such as ground water contamination, hazardous waste disposal, oil and gas recovery, and geothermal energy extraction. In borehole geophysics and engineering, fractures are usually located by acoustic borehole televiewer logging, however, not all of the observed fractures are permeable. The caliper log, on the other hand, provides the information abou...

This study mainly takes the thick oil layer in Lamadian Oilfield as an example. is developed area dominated by fluvial sediments, and reservoir sand body space changes frequently. If we only rely on traditional single well logging data, it difficult to directly effectively predict of whole sedimentary body, spatial configuration relationship between river boundary other microfacies can not be p...

Selective logging is one of the most common forms of forest use in the tropics. Although the effects of selective logging on biodiversity have been widely studied, there is little agreement on the relationship between life-history traits and tolerance to logging. In this study, we assessed how species traits and logging practices combine to determine species responses to selective logging, base...

Shear velocity is an important parameter in pre-stack seismic reservoir description. However, the real study, high cost of array acoustic logging leads to lacking a shear curve. Thus, it crucial use conventional well-logging data predict velocity. The prediction methods mainly include empirical formulas and theoretical rock physics models. When using formula method, calibration should be perfor...

The reservoir in different parts of buried-hill draping zone is often quite different, so it great significance to clarify the characteristics for exploration and development. Based on core, well logging, seismic data production data, oil layer Ⅱ lower second member Dongying Formation L oilfield, Bohai Bay Basin, offshore eastern China are systematically studied. Analyses facies, well-seismic c...

avo theory was introduced around 20 years ago. in recent years, this technique was become to a major tool in hydrocarbon sources exploration. by the help of this method with the suitable understanding from underground layers and knowing how to use this technology, quantitative specifications of reservoir can be recognized. avo analysis is a seismic technique that by using of pre-stack data, est...

Stress waves contain useful information about the properties of porous materials; they can be recovered through different non-destructive testing methods such as crosswell, vertical seismic profile, borehole logging as well as sonic tests. In all these methods, it is crucial to assess the effects of frequency on wave attributes including velocity and intrinsic attenuation. The dependency of per...

Accurately predicting the critical differential pressure (CDP) of sand production contributes to improving peak-shaving capacity and ensuring safe operation underground gas storage (UGS). The CDP sanding in target wells UGS was predicted coupling laboratory tests, inversed analysis with well logging data numerical simulations. in-situ mechanical properties rock were estimated by test results we...

water logging stress is one of the most important factors which affect wheat production particularly in western regions of golestan province. this experiment was carried out in order to evaluate of six genotypes (n-81-18, arta, moghan, n-80-19, urwyt-82-11 and urwyt-82-17) of bread wheat in water logging condition at 2006-2007 growing season in gorgan agricultural research station. the experime...