Disturbance and ecological status during a classification. The maximum disturbance allowed will be examined via a Density/Disturbance Calculation Tool (DDCT) process conducted by the Federal Land Management Agency on. The scale is properly calibrated at 0.0g, and minimizing the disturbance to the.In Wyoming, landowners can use this tool to evaluate disturbance percentages, location, and number of disturbances of suitable sage-grouse habitat within the area affected by a project.
Section Half Multisensor Logger measurements Whole-Round Multisensor Logger measurementsThe State developed the Density and Disturbance Calculation Tool (DDCT)2, a unique spatially based tool that that calculates both the number of disruptive activities averaged per square mile (640 acres) and total surface disturbance within a proposed project area. Paleomagnetism and rock magnetism of discrete samplesStand density index (SDI also known as Reinekes Stand Density Index after its founder) is a measure of the stocking of a stand of trees based on the number of trees per unit area and diameter at breast height (DBH) of the tree of average basal area, also known as the quadratic mean diameter.It may also be defined as the degree of crowding within stocked areas, using various growing space.
Planktonic foraminifer and bolboformid datums. Mineral recognition peaks for XRD analyses. Wireline tool strings, Expedition 317.
Calibrated calcareous nannofossil datums. Benthic foraminifers used to estimate paleodepths. Abbreviations for planktonic foraminiferal genera.
Once the vessel was positioned at a site, the thrusters were lowered and a positioning beacon was dropped to the seafloor. A SyQuest Bathy 2010 CHIRP subbottom profiler was used to monitor the seafloor depth on the approach to each site to reconfirm the depth profiles from precruise surveys. Acronyms and units for wireline tools.Doi:10.2204/iodp.proc.317.102.2011 Operations Site locationsGlobal Positioning System (GPS) coordinates from precruise site surveys were used to position the vessel at all Expedition 317 sites. Downhole measurements using wireline tool strings.
The driller can detect a successful cut, or "full stroke," from the pressure gauge on the rig floor.APC refusal is conventionally defined in two ways: (1) the piston fails to achieve a complete stroke (as determined from the pump pressure reading) because the formation is too hard or (2) excessive force (>60,000 lb ~267 kN) is required to pull the core barrel out of the formation. The inner barrel then advances into the formation and cuts the core. After the APC core barrel is lowered through the drill pipe and lands near the bit, the drill pipe is pressured up until the two shear pins that hold the inner barrel attached to the outer barrel fail. The APC system cuts soft-sediment cores with minimal coring disturbance relative to other IODP coring systems. Drilling operationsAll three standard coring systems—the advanced piston corer (APC), the extended core barrel (XCB), and the rotary core barrel (RCB)—were used during Expedition 317.The APC system was used in the upper portion of each hole when coring in the top of the hole was the objective. The final hole position was the mean position calculated from the GPS data collected over a significant portion of the time the hole was occupied.
Density Disturbance Calculation Tool Free The APC
Most APC cores recovered during Expedition 317 were oriented using the Flexit tool (see "Paleomagnetism"). When the need for drillover was anticipated, standard steel core barrels were used because they are stronger than the nonmagnetic barrels. When a full or partial stroke was achieved but excessive force could not retrieve the barrel, the core barrel was sometimes "drilled over": after the inner core barrel was successfully shot into the formation, the drill bit was advanced to total depth to free the APC barrel.Nonmagnetic core barrels were used during all conventional APC coring to a pull force of ~40,000 lb. Note that this resulted in a nominal recovery of ~100% based on the assumption that the barrel penetrated the formation by the equivalent of the length of core recovered.
A lockable flapper valve was used so that downhole logs could be collected.The RCB system was deployed when XCB coring rates diminished below an acceptable level or the bit was destroyed by the increasingly hard formation. A typical tapered drill string was not used during Expedition 317 because of the shallow water depth. The XCB system was used extensively during Expedition 317 and to greater depths than anticipated.The bottom-hole assembly (BHA) used for APC and XCB coring during Expedition 317 was composed of an 11 inch (~29.05 cm) drill bit, a bit sub, a seal bore drill collar, a landing saver sub, a modified top sub, a modified head sub, a nonmagnetic drill collar, five 8 inch (~20.32 cm) control length drill collars, and a tapered drill collar, followed by a 5½ inch drill pipe to the surface. The XCB cutting shoe (bit) extends ~30.5 cm ahead of the main bit in soft sediments but retracts into the main bit when hard formations are encountered. The smaller bit can cut a semi-indurated core with less torque and fluid circulation than the main bit, optimizing recovery. The XCB is a rotary system with a small cutting shoe that extends below the large rotary APC/XCB bit.
These designations were combinations of origin of depth scales (rig floor or seafloor), measurement units (m), and method of construction (composite). IODP depth conventionsIn the last few decades, Deep Sea Drilling Project (DSDP), Ocean Drilling Program (ODP), and IODP Phase 1 reports, diagrams, and publications used three primary designations to reference depth: meters below rig floor (mbrf), meters below seafloor (mbsf), and meters composite depth (mcd). Such intervals were typically drilled using a center bit installed within the RCB bit. In some cases, the drill string was drilled or "washed" ahead without recovering sediments to advance the drill bit to a target depth to resume core recovery. The RCB system requires a dedicated RCB BHA and a dedicated RCB drilling bit.The BHA used for RCB coring included a 9⅞ inch RCB drill bit, a mechanical bit release, a modified head sub, an outer core barrel, a modified top sub, and seven control length drill collars, followed by a tapered drill collar to the 5½ inch drill pipe.Most cored intervals were ~9.5 m long, which is the length of a standard core barrel and the length of a joint of drill pipe.
However, the management and use of multiple maps, composite scales, or splices for a hole or a site was problematic, and the requirement to integrate scientific procedures among three IODP implementing organizations amplified the need to establish a standardized and versatile depth framework. Consequently, new scale type designations were created ad hoc to differentiate the wireline logging scale from the core depth scale so that depth-mapping procedures and products could be adequately described. For example, application of the same designation to scales created with distinctly different tools and methods was common (e.g., mbsf used for scales measured both by drill string tally and the wireline).
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