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The term "molasse" (/məˈlæs/) refers to sandstones, shales and conglomerates that form as terrestrial or shallow marine deposits in front of rising mountain chains. The molasse deposits accumulate in a foreland basin, especially on top of flysch—like deposits, for example, those that left from the rising Alps, or erosion in the Himalaya. These deposits are typically the non-marine alluvial and fluvial sediments of lowlands, as compared to deep-water flysch sediments. Sedimentation stops when the orogeny stops, or when the mountains have eroded flat.
Quantitative characterization method of three main controlling factors of lacustrine molasse facies belt
The application provides a method for quantitatively characterizing three ancient main control factors of a lacustrine mixed sedimentary facies belt, which comprises the following steps: Step 1, mixed sedimentary rock type division is performed to identify the mixed sedimentary facies belt type; Step 2, ancient topography analysis is performed to establish a quantitative relationship template of the mixed sedimentary facies belt development and the ancient topography; Step 3, ancient climate analysis is performed to establish a quantitative relationship template of the mixed sedimentary facies belt development and the ancient climate; Step 4, ancient salinity analysis is performed to establish a quantitative relationship template of the mixed sedimentary facies belt development and the ancient salinity; and Step 5, a comprehensive quantitative characterization template of the three ancient main control factors of the mixed sedimentary facies belt is established. The method for quantitatively characterizing the three ancient main control factors of the lacustrine mixed sedimentary facies belt has a good effect on the analysis of the three ancient main control factors of the mixed sedimentary facies belt, and can provide technical guidance for the analysis of the control factors of the mixed sedimentary facies belt development and the research on the development law of the mixed sedimentary facies belt under the same sedimentary background.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1