ABSTRACT

Hu, S.; Wang, J.; Zhao, Y.; Qin, Y.; Chen L.; Liu W., and Liu, Y., 2020. An unconventional method for well-seismic integrated cycle correlation and sedimentary evolution of fluvial reservoir. In: Wan, Z. (ed.), Coordinated Sustainable Development in Coastal Areas: Environment and Economy. Journal of Coastal Research, Special Issue No. 109, pp. 85–92. Coconut Creek (Florida), ISSN 0749-0208.

Focusing on the difficulties of fluvial sedimentary stratigraphic correlation and sedimentary evolution study in a complex fault-block area, taking the meandering sedimentation of Neogene Ming2 (Nm2) oil group of block 1 of Gangxi oilfield as an anatomical object, by applying well-seismic integration based on the comprehensive analysis of geological, coring, well-logging and seismic data in the oilfield development area, this paper establishes the correlation profiles and accurate stratigraphic frameworks of cyclic stratigraphic division in the study area, and divides Nm2 oil group into 3 mid-term base level cycles (MSC1, MSC2 and MSC3) and 22 short-term base level cycles (corresponding to 22 subzone). The plane sedimentary microfacies distribution of every single layer is characterized based on the study of single-well sedimentary microfacies; meanwhile, the vertical evolutionary patterns of meandering channel sandbody in the study area is established, that is, along with the rise and fall of the base level cycle, it is the increase and decrease in A/S cyclic change that controls the lateral distribution characteristics and vertical overlap pattern of channel sands. Acuurate cycle stratigraphic analysis and sedimentary microfacies study provide the geological basis for oilfield management in the middle and late stage of oilfield development.

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