What environmental issues are associated with hydraulic fracturing?
The actual practice of hydraulic fracturing (or “fracking”) is only a small part of the overall process of drilling, completing, and producing an oil and gas well.
Environmental issues that are specifically related to hydraulic fracturing include:
- water availability
- spills of chemicals at the surface
- impacts of sand mining for use in the hydraulic fracturing process
- surface water quality degradation from waste fluid disposal
- groundwater quality degradation
- induced seismicity from the injection of waste fluids into deep disposal wells
Any kind of oil and gas drilling can additionally cause:
- reduced air quality
- night sky light pollution
- landscape changes such as forest fragmentation
- disruption to wildlife corridors and habitats
It is important to note that not all of these potential impacts occur at every site and many impacts can be avoided or mitigated with the proper practices.
Why have some estimates of undiscovered technically recoverable oil or gas changed so much from previous estimates?
Petroleum geologists have long known that oil and gas resources were present in “tight” or impermeable formations such as shale. But there was no way feasible way to extract that oil and gas, so they were not “technically recoverable” and were not be included in USGS assessment results.
Thanks to new technologies,...Read Full Answer
Who is responsible for monitoring the issues associated with hydraulic fracturing and protecting our environment?
Individual states regulate many aspects of oil and gas exploration and production.
Federal land managers, such as the Bureau of Land Management (BLM), the U.S. Forest Service (USFS), and the U.S. Fish and Wildlife Service (USFWS) have some oversight of oil and gas activities on the lands they manage. This includes...Read Full Answer
Hydraulic fracturing in vertical wells has been used for over fifty years to improve the flow of oil and gas from conventional reservoirs. However, the current practice of horizontal drilling coupled with multiple applications of hydraulic fracturing in a single well was pioneered in the late 1980’s and has continued to...Read Full Answer
Hydraulic fracturing, informally referred to as “fracking,” is an oil and gas well development process that typically involves injecting water, sand, and chemicals under high pressure into a bedrock formation via the well. This process is intended to create new fractures in the rock as well as increase the size, extent, and...Read Full Answer
There isn’t really a “typical” fractured well because the amount of water used depends on the rock formation, the operator, whether the well is vertical or horizontal, and the number of portions (or stages) of the well that are fractured. In addition, some water is recycled from fluids produced by the well, so the net...Read Full Answer
Reports of hydraulic fracturing causing felt earthquakes are extremely rare. However, wastewater produced by wells that were hydraulic fractured can cause “induced” earthquakes when it is injected into deep wastewater wells.
Wastewater disposal wells operate for longer durations and inject much more fluid than the...Read Full Answer
An area undergoing production of oil or gas using hydraulic fracturing technology shares many features with areas where conventional oil or gas is being developed, including:
- Compressor stations
- Processing facilities.
Features that are unique to areas in...Read Full Answer
In a conventional oil or gas field, where the oil or gas is in relatively porous and permeable rock (i.e. the pores are connected), the oil or gas can usually flow naturally from the reservoir rock to the wellbore. Nonetheless, a variety of techniques are often used to improve the flow of oil or gas, including hydraulic...Read Full Answer
Conducted properly, hydraulic fracturing (or “fracking”) has little possibility of contaminating water supplies. Properly constructed wells prevent drilling fluids, hydraulic fracturing fluids, deep saline formation waters, or oil and gas from entering aquifers. Carefully constructed and operated well sites have the ability...Read Full Answer
Most of the water and additives used in hydraulic fracturing (or “fracking”) remain deep underground in the geologic formation from which the oil or gas is being extracted. But some of the fluid, mixed with water or brine from the formation, returns through the well to the surface and is referred to as “produced water”....Read Full Answer
Decades or longer may be needed to fully assess the effects of unconventional oil and gas production on the quality of groundwater used for drinking water in Arkansas, Louisiana, and Texas
Evidence of Unconventional Oil and Gas Wastewater Found in Surface Waters near Underground Injection Site
These are the first published studies to demonstrate water-quality impacts to a surface stream due to activities at an unconventional oil and gas wastewater deep well injection disposal site.
The amount of water required to hydraulically fracture oil and gas wells varies widely across the country, according to the first national-scale analysis and map of hydraulic fracturing water usage detailed in a new USGS study accepted for publication in Water Resources Research, a journal of the American Geophysical Union.
In a study of 13 hydraulically fractured shale gas wells in north-central Pennsylvania, USGS researchers found that the microbiology and organic chemistry of the produced waters varied widely from well to well.
What Happens to the Water? Assessing Water Quality in Areas with Hydraulically Fractured Oil and Gas Wells
More data and research are necessary to best understand the potential risks to water quality associated with unconventional oil and gas development in the United States, according to a recent U.S. Geological Survey study.
MENLO PARK, Calif.— A paper published today in Science provides a case for increasing transparency and data collection to enable strategies for mitigating the effects of human-induced earthquakes caused by wastewater injection associated with oil and gas production in the United States.
Two new U.S. Geological Survey publications that highlight historical hydraulic fracturing trends and data from 1947 to 2010 are now available.
Hydraulic fracturing fluids are believed to be the cause of the widespread death or distress of aquatic species in Kentucky's Acorn Fork, after spilling from nearby natural gas well sites. These findings are the result of a joint study by the U.S. Geological Survey and the U.S. Fish and Wildlife Service.
A hydraulic fracturing operation is underway at this drilling pad in the Marcellus Shale gas play of southwestern Pennsylvania.
A typical drill pad in the Marcellus Shale gas play of southwestern Pennsylvania.
Well heads hooked up in preparation for a hydraulic fracturing operation at a drill pad in the Fayetteville Shale gas play of Arkansas.
Equipment set up to pump water from a lake to an impoundment for hydraulic fracturing in the Fayetteville Shale of Arkansas.
U.S. Geological Survey (USGS) scientist collecting water samples on a wastewater disposal facility in West Virginia to assess potential environmental impacts due to activities at the site. Shifts in the overall microbial community structure were present in stream sediments that contained chemicals associated with unconventional oil and gas wastewaters.
Hydraulic fracturing is the process of injecting wells with water, sand, and chemicals at very high pressure. This process creates fractures in deeply buried rocks to allow for the extraction of oil and natural gas as well as geothermal energy. USGS scientists discuss the opportunities and impact associated with hydraulic fracturing. Doug Duncan, associate coordinator for the USGS Energy Resources Program, addresses the increasing role that unconventional oil and gas resources play in the nation's petroleum endowment. USGS hydrologist Dennis Risser discusses some of the major water availability and quality challenges associated with natural gas development, with a focus on the Marcellus Shale in Pennsylvania. Bill Leith, associate coordinator the USGS Hazards Program, concludes by discussing the potential connection between disposal of waste fluids from hydraulic fracturing and earthquakes.