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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
fullbore formation microimager
Fullbore formation microimager (FMI) logging and gamma ray (GR) curves for ... Available to Purchase
Fullbore formation microimager logging, gamma ray (GR, API), and flushed zo... Available to Purchase
Cores (left) and corresponding fullbore formation microimager (FMI) logging... Available to Purchase
Wire-line and fullbore formation microimager logging for the tight sandston... Available to Purchase
Facies interpretation based on cores, fullbore formation microimager (FMI) ... Available to Purchase
The use of borehole imaging techniques in the exploration for stratigraphic traps: an example from the Middle Devonian Gilwood channels in north-central Alberta Available to Purchase
Masked-SwinUnet-powered microresistivity borehole image inpainting Available to Purchase
Tectonic fractures induced by strike-slip faulting in intracratonic ultradeep carbonate rocks: Insights from the finite element method and self-adaptive constraints computational model for boundary conditions Available to Purchase
Gravity-flow deposits and implications for unconventional oil and gas in the Ordovician–Silurian Wufeng–Longmaxi Formation, Sichuan Basin, South China Available to Purchase
Rock Types and Permeability Prediction from Dipmeter and Image Logs: Shuaiba Reservoir (Aptian), Abu Dhabi Available to Purchase
Azimuthal investigation of compressional seismic-wave attenuation in a fractured reservoir Available to Purchase
Outcrop-behind Outcrop (Quarry): Multiscale Characterization of the Woodford Gas Shale, Oklahoma Available to Purchase
Abstract An outcrop-behind outcrop study was conducted in and adjacent to a 300 × 100 × 16 m (980 × 330 × 50 ft) quarry of the gas-producing Woodford Shale to structurally/stratigraphically characterize it from the pore to subregional scales using a variety of techniques. Strata around quarry walls were described and correlated to a 64 m (210 ft) long continuous core drilled 150 m (500 ft) back from the quarry wall and almost to the Woodford-Hunton unconformity. Borehole logs obtained include neutron and density porosity (NPHI and DPHI) logs, and logs from Elemental Capture Spectroscopy (ECS™), Combinable Magnetic Resonance (CMR-Plus™), Fullbore Formation MicroImager (FMI™), and sonic scanner (Modular Sonic Imaging Platform, or MSIP™)—all manufactured by Schlumberger. The strata around the quarry are horizontally bedded. Borehole logs were used to identify a basic threefold subdivision into an upper relatively porous quartzose interval; a middle, more clay-rich, and less porous interval; and a lower interval of intermediate quartz-clay content. These intervals correspond to the informally named upper, middle, and lower Woodford. Detailed core and quarry wall description revealed several types of finely laminated lithofacies, with varying amounts of total organic carbon (TOC). The FMI log revealed a much greater degree of variability in laminations than can be readily seen with the naked eye. Organic geochemistry and biomarkers are closely tied to these lithofacies and record cyclic variations in oxic-anoxic depositional environments, which correspond to relative sea level fall-rise cycles. At the scanning electron microscopy scale, microfractures and microchannels are common and provide tortuous pathways for gas (and oil) migration through the shales. Based on FMI and core analysis, fracture density is much greater in the upper quartzose lithofacies than in the lower, more clay-rich lithofacies. A laser imaging detection and ranging (LIDAR) survey around the quarry walls documented two near-vertical fracture trends in the quartzose lithofacies: one striking N85°E with spacings of 1.2 m (4 ft) and the other striking N45°E related to the present stress field. The FMI analysis only imaged the latter fracture set. Both log-derived and laboratory-tested geomechanical property measurements documented a significant relationship between shale fabric (laminations and preferred clay-particle orientation) and rock strength, and a secondary relationship to mineral composition. Porosity and microfractures or microchannels also appear to influence rock strength. This integrated study has provided insight into the causal relations among Woodford properties at a variety of scales. In particular, a stratigraphic (vertical) segregation of lithofacies can be related to cyclic variations in depositional environments. The resulting stratified zones exhibit variations in their hydrocarbon source and reservoir (fracturable) potential. Such information and predictive capability can be valuable for improved targeted horizontal drilling into enriched source rock and/or readily fracturable reservoir rock in the Woodford and perhaps other gas shales.