Low Potential For Gas Research Articles

Design of Microbial Methane Oxidation Systems for Landfills

Landfill methane currently represents the largest global source of greenhouse gas emissions from the solid waste sector. Emissions are expected to increase due to increasing waste generation, particularly in countries still landfilling biodegradable wastes. As a complementary measure to gas extraction with subsequent flaring or energy conversion, or for emissions reduction from old landfills or from landfills containing wastes with a low gas potential, microbial methane oxidation systems (MMOS) are considered a promising technology. Numerous studies relating to controlling factors and enhancement of microbial methane oxidation in biocovers, biowindows or biofilters, both in laboratory and in large scale field settings, have been published. The design of optimized MMOS requires thorough understanding of the involved processes, specifically the biological ones and of those related to the transport of gas and water in porous media, and of the impact of material properties and external environmental factors on these processes. Consequently, the selection of materials that are suitable from a biogeochemical and from a geotechnical point of view, meeting the required water and gas transport properties, are key aspects in the design process. This paper reviews the scientific background of the relevant concepts and processes dictating MMOS performance, and provides guidance on layout and design steps, including choice of materials and quality control. Further, a decision tree to support the choice of MMOS is proposed. This paper provides the scientific foundation for upcoming technical guidance documents.

Evaluation of oil and gas potential of blocks A and B Song Hong basin and suggested exploration plan

Basing on the structure, stratigraphic, depositional conditions and petroleum system the petroleum prospect, Song Hong northern basin, particularly, blocks A and B was evaluated. SIgnificantly high gas potential areas are Hong Ha, Sapa and Bach Long Bac structural sections. Predominantly oil potential is found in Hau Giang and Vam Co Dong structural areas. Low gas potential is found in Cay Quat and Ben Hai structural sections and low oil potential is found in Vam Co Tay, Chi Linh, Do Son and Tien Lang structural areas. The result of the calculation of a petroleum accumulattion capacity at the local, enhanced recoveral volume, risk parameters for stored gas and oil amount in blocks A and B are the oil potential in Kainozoi basement rock (KZ): oil accumulation volume at the local is 1722.9 million barrels (273.9 million cubic meters); oil recovery coefficient is 0.25 %; oil recoverable amount is 430.7 million barrels (68.5 million cubic meters). The gas potential in Miocene structural areas: gas accumulation volume at the local is 1620 BSCF (45.8 billion cubic meters); gas recoverable amount is 972 BSCF (27.5 billion cubic meters). The coefficient of success is quite low at 0.18 - 0.31 for gas and 0.08 – 0.23 for oil. Suggestion for the exploitation and exploration in further steps is to servey the 3D seismic in a 1500 square kilometer area and drill 2 wells for the exploration.

Reservoir Potential of Silurian Carbonate Mud Mounds in the Southern Sichuan Basin, Central China

: Lower Silurian mud mounds of the Shinuilan Formation, located in the southern Sichuan Basin, China, have developed in open shelf settings in deeper water than shallow-water reef-bearing limestones that occur in the region. An integration of the outcrop, drill data and seismic profiles show that contemporaneous faults have controlled the boundary and distribution of the sedimentary facies of Lower Silurian rocks in the southern Sichuan Basin. Mounds appear to have developed in the topographic lows formed by synsedimentary faulting, on the shelf of the Yangtze Platform. Average mound thickness is 20 m, maximum 35 m. Mounds are composed mainly of micrite, possibly microbially bound, and are overlain by shales. Mound tops are preferentially dolomitized, with the Mg2+ source probably from the clay content of the mound-top carbonate. Microfacies analysis and reconstruction of the diagenetic history reveal that the mound tops have higher porosity, and are gas targets; in contrast, mound cores and limbs show pores filled by three generations of calcite cement, and therefore have a low gas potential.

Structural Aspects and Hydrocarbon Potentials of Basins on Continental Margins Off Labrador and Newfoundland: ABSTRACT

The continental shelf of Labrador and Newfoundland is underlain by several discrete subbasins. On the western margin of the Labrador Sea, north of the east-trending, east-plunging Cartwright arch, the continental shelf is underlain by up to 10 km of Upper Cretaceous to upper Tertiary marine clastics that constitute the Hopedale-Saglek basin. These sediments overlie a narrow rifted basin of early to middle Cretaceous age, informally called the Erik graben. Further south, between the Cartwright arch and the axis of the Avalon uplift, the continental shelf is more complex. This region contains the St. Anthony basin, an Appalachian successor basin with upper Paleozoic coal measures and red clastics; the somewhat sinuous, generally northeast-southwest trending Avalon basin containing mixed facies of Mesozoic and Tertiary age; and an unnamed, early Tertiary depocenter having a NNW-SSE trend which is infilled with mostly fine-grained marine clastic rocks. Hydrocarbon occurrences discovered can be explained in terms of the nature and thermal maturity of probable source rocks and the time of trap formation. Liquid hydrocarbons have only been found in significant amounts in the Avalon basin where traps are supra-adjacent to mature Upper Jurassic source rocks. However, in this basin Lower Cretaceous deltaic sequences can be expected to generate gas. In the remaining basins the sequences contain organic matter that is largely terrestrial and/or at a low level of thermal maturity. In these basins, a low potential for gas is likely. End_of_Article - Last_Page 1672------------