Northwest Guizhou Late Permian Coal-bearing Rock Series Of High Resolution Sequence Stratigraphy And Coal Accumulation Model

In this paper, Northwestern Late Permian Longtan Formation coal-bearing rocks have been studied,Extensive use of logging in Northwestern, core data and other data and the sedimentology and high resolution sequence stratigraphy of basic theory, Northwestern Late Permian Coal Measures sequence boundary has been divided,And establish the Late Permian in northwest Guizhou Coal Measures sequence stratigraphic framework. Finally, the next isochronous stratigraphic framework of the Late Permian in northwest Guizhou coal accumulation mode. Coal center that was controlled by the migration of the rotation caused by plate rotation cycle deposition mechanism.(1)Through the Late Permian coal-bearing rocks of the core and logging the sedimentary cyclicity reflected characteristics of the Late Permian coal-bearing rock strata to identify a total of three three composite sequences. Single well and connected well on the comparative analysis,In the study area east of the main composite sequence carbonate platform depositsâ… , west of the barrier lagoon, on the delta deposit portfolio. Composite Sequenceâ…¡continue to develop in the study area east of Brush salt deposits, west of the delta deposits under development. Composite Sequenceâ…¢in the study area east of the carbonate rocks extend to the west of the deposition of narrow barrier lagoon, while the development of limited tidal deposition.(2)Northwestern Late Permian sedimentary environment is primarily outside the carbonate platform depositional system of coast, barrier shoreline clastic depositional system, delta system and the meandering river lake sedimentary system.The Late Permian coal-rich belt directly controlled by the formation and distribution of ancient geography, the rich deposits of coal with a combination with Delta most closely. Followed by the combination of barrier shoreline deposits(3) In the study area of the Late Permian coal-bearing rocks of the formation. Overall,The whole sequence in the composite order phaseâ… coal deposits in the southern center of Liupanshui area, and deposited in the composite sequenceâ…¡stage moved to the Sands, Renhuai,â…¢sequence deposited in the composite stage, the clockwise rotation of the land makes the polymer Central place of coal to move back south.(4) Changes in the environment coal and coal center migration dynamic mechanism that is largely the study area and land occur in the Late Permian clockwise rotation of the related,Deposition in the rotation cycle of coal under the action of the migration of the center counter clockwise. Episodic coal accumulation can be well explained with a rotating cycle of deposition...