The interpretation of borehole images begins with the detection and classification features—a time-consuming manual process subject to variations between interpreters. In seeking automate part for most frequently picked features (which in circumferential from clastic rock environments are sinusoids corresponding planar or subplanar bedding surfaces fractures), it is not necessary pick all instances, but sufficient representative instances satisfy objective, accounting a broad range apparent...

Images rendered from measurements made by wireline microresistivity imaging tools include longitudinal gaps whenever the well circumference exceeds total width of pad-mounted electrode arrays. The fraction an image containing null data depends on tool design, and it is commonly approximately 30% for 261 mm (8.5 in.)-bit size wells increasing to 50% in 311 (12.25 in.) wells. We use cues measured parts infer information missing gaps; a method has been developed that simulates process...

Abstract Borehole microresistivity images are an important source of high resolution information with broad application in geology and petrophysics. They contain large volumes data which (for reasons efficiency reproducibility) makes it desirable to automate aspects quantitative analysis such as feature extraction. One several hurdles be addressed this challenge is the typically incomplete circumferential coverage measurements from wireline tools (often less than 70%). Robust estimates...

Density and neutron well log processing algorithms designed for conventional oil gas reservoirs are not optimum coal bed methane evaluation. In particular the corrections applied to measured electron density values (to derive bulk density) assume a calcium carbonate rock matrix, quantitative analysis of neutron porosity logs is hindered by low count rates in lack published information regarding sensitivity of measurement variations composition. The thinly-bedded nature many coals an...

Abstract Measurements of magnetic flux leakage are used extensively to map and monitor defects corrosion in pipelines, well casings, storage tanks. The application this method enables locating determining metal loss. measurements have complex response characteristics, which must be understood optimize measurement design data processing choices. Until recently, the industry lacked an adequate first principles description sensitivity defect penetration size, including foundational cases...

Abstract Density, photoelectric, neutron, and gamma ray logs are key inputs to the evaluation of unconventional resources. Each has a finite spatial resolution, properties beds thinner than this cannot be measured directly but (in principle) available from inversion if logs’ response functions known, thickness each bed is known an independent high-resolution source. An method described for with apparent dip angles less about 60 degrees which uses pre-computed measurement-specific nuclear...

Abstract Shear slowness is commonly computed from well log dipole flexural mode data using slowness-time-coherence (STC) processing. Flexural dispersion handled by restricting the signal's frequency content to low frequencies that travel close formation's shear velocity, or altering phase relationships within waveforms prior STC processing in accordance with observed characteristics. Restricting range may not eliminate need for a residual correction, however, and noisy environments curves...

The automation of repetitive tasks in borehole image data analysis has the potential to increase efficiency and consistency, deliver time savings that can be invested other aspects integration interpretation. This motivated development multiple innovative technologies, three which are described this paper: data-driven deterministic reconstruction missing address incomplete coverage from wireline logs (and gaps LWD images), calibration characterization microresistivity measurements provide...