Sedimentary charateristics and hydrocarbon accumulation in Northeast Sichuan basin

Abstract

Northeast Sichuan basin is a Mesozoic–Cenozoic basin in the northern margin of the Yangtze plate which has a complex tectonic background and hydrocarbon accumulation history. By means of the analysis method of wave processes, major cycles of sedimentary wave process in this basin have been studied. The results show that there are five-order cycles corresponding to 760, 220, 100, 35 and 20 Ma respectively, two first-order sedimentary cycles (220 Ma) and four second-order sedimentary cycles (100 Ma). The authors find that the second-order sedimentary cycles are well matched with reservoir formation cycles through studying the relationship between second-order sedimentary cycles and reservoir formation cycles, and divide three reservoir formation cycles in this basin.

Keywords

sedimentary wave characteristics, wave cycle, reservoir formation cycle, Northeast Sichuan basin