Topic
Petroleum reservoir
About: Petroleum reservoir is a research topic. Over the lifetime, 5403 publications have been published within this topic receiving 83535 citations. The topic is also known as: petroleum deposit.
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TL;DR: Based on the coexisting intact n-alkane series, evident UCM and 25-norhopanes in the oil as well as the bimodal distribution pattern of homogenization temperatures (T h ), ranging from 80 to 100 ǫ c and from 115 to 135 ǒ c, respectively, in fluid inclusions within the reservoir rocks, it was concluded that the oil reservoir has been twice charged during its oil filling history.
109 citations
TL;DR: In this article, the authors analyzed three major hydrocarbon bearing intervals in the Lunnan lower bulge for their stable carbon isotopes and molecular biomarkers and concluded that the recently discovered deep (6500m) eastern Lungu giant Ordovician gas condensate pool with an estimated reserve of 723 million bbl oil equivalent is a secondary hydrocarbon accumulation derived from the mixing of an early formed oil and a late formed gas.
108 citations
Book•
15 Aug 2012
TL;DR: In the early 1970s, most exploration geologists in the United States considered coalbed methane, shale gas, and tight-gas sands as unconventional resources (Law and Curtis, 2002). Tax incentives and federally funded research beginning in the late 1970s helped make these resources economically viable in the last two decades of the 20th century.
Abstract: In the early 1970s, most exploration geologists in the United States considered subeconomic or marginally economic petroleum resources such as coalbed methane, shale gas, and tight-gas sands as unconventional resources (Law and Curtis, 2002). Tax incentives and federally funded research beginning in the late 1970s helped make these resources economically viable in the last two decades of the 20th century. Economics aside, two important geologic attributes characterize most unconventional petroleum resources (Law and Curtis, 2002). Conventional petroleum systems are buoyancy-driven accumulations found in structural or stratigraphic traps, whereas most unconventional systems exist independent of a water column and are generally not found in structural or stratigraphic traps.
Shale reservoirs are not new. The first commercial hydrocarbon production in the United States was from a well drilled in 1821 in a shale gas reservoir. By 2000, more than 28,000 wells had been drilled in shale gas reservoirs. Rising gas prices and technological advancements in horizontal drilling and hydraulic fracturing associated with the development of the Barnett Shale led to a boom in shale gas development in the early years of the 21st century. Now the exploitation of shale reservoirs is turning to natural gas liquids, condensate, and oil. Far from being isotropic and homogeneous, as once naively envisioned, shale reservoirs are complexly layered accumulations of fine-grained sediment. Geologic variation on scales ranging from that of stratal architecture to that of lamination within individual beds must be understood in order to locate and exploid areas of higher production within shale reservoirs. Shale reservoirs remain largely geologic plays - notmerely lease plays or strictly engineering plays made possible by improvements in drilling and completion technology.
108 citations
TL;DR: Interpretation of NMR logs uses both relaxation and diffusion to distinguish the different fluids present in the formation.
108 citations
TL;DR: In this article, flow tests were performed by continuously circulating CO{sub 2}-saturated brines through Cardium formation cores and all the cores initially showed a large drop in permeability, after which permeability rose steadily but did not regain its initial value.
Abstract: When CO{sub 2} is injected into petroleum reservoirs it forms carbonic acid in the brine phase and interacts with reservoir rock. Flow tests were performed by continuously circulating CO{sub 2}-saturated brines through Cardium formation cores. All the cores initially showed a large drop in permeability. after which permeability rose steadily but did not regain its initial value. Microscopic examination of the cores indicates that fines had been released and had migrated toward pore throats, reducing permeability, In addition, mineral alterations occurred, including the dissolution of calcite and siderite, which may account for the gradual rise in permeabilities noted in the experiments.
108 citations