This study focused on addressing this unsolved issue from the Ordovician carbonate paleokarst in the Huai-Fu Basin, which is located in the southeast of Southern North China Basin and one of the key areas for oil and gas exploration. However, the development characteristics, formation stages, formation environments and mechanisms of the carbonate reservoirs in Southern North China Basin are still unclear, which caused the failures of many oil and gas exploration wells. With the reduction of oil and gas reserves and the increase of mining difficulty in Northern China, the carbonate rocks in Southern North China Basin are becoming a significant exploration target for carbonate reservoirs. Its distinction from similar ichnotaxa, such as Thalassinoides, increase its value as facies indicator and for sequence-stratigraphic analysis. A review of the literature together with new observations from 87 stratigraphic units reveals that Balanoglossites is a very common constituent of mainly monospecific ichnofabrics in carbonates and has a wide distribution in shallow-marine environments from the Ediacaran throughout the Phanerozoic. Balanoglossites is assumed to be produced by polychaetes, whereas Thalassinoides results from the activity of crustaceans. ramosus Knaust, 2008 can be distinguished from Thalassinoides suevicus (Rieth, 1932) and T. A rigorous application of ichnotaxobases as defined in their diagnoses and evidenced by their type material, relevant ichnospecies such as Balanoglossites triadicus Mägdefrau, 1932 and B. Instead, such burrows have been assigned to different ichnotaxa, foremost among them the superficially similar ichnogenus Thalassinoides Ehrenberg, 1944. Despite its basin-wide distribution, this characteristic trace fossil only rarely has been recognised elsewhere. The ichnogenus Balanoglossites Mägdefrau, 1932 is a common constituent of firmground ichnofabrics in shallow-marine carbonates of the Middle Triassic Germanic Basin, from where it has been known for about 220 years.
0 kommentar(er)
