Study on Sedimentary Microfacies of X Section of Jiufotang Formation in Block A
DOI:
https://doi.org/10.54097/b1pehh02Keywords:
Jiufotang Group, Sedimentary Microfacies, Delta DepositionAbstract
Block A is located in the Mesozoic half-graben faulted basin, and the Lower Cretaceous Jiufotang Formation constitutes the main oil-bearing series. Years of exploration and development practice shows that sedimentary microfacies are the key factors controlling the spatial configuration and reservoir performance of reservoir sand bodies. Therefore, based on the results of core observation, logging response and logging interpretation, this paper carried out a systematic study on the sedimentary microfacies of Jiufotang Formation in Block A. The results of the study show that the X section of the Jiufotang Formation in the A block mainly identifies two types of sedimentary facies : fan delta and lake, which are subdivided into four sedimentary microfacies : underwater distributary channel, sheet sand, underwater interdistributary bay and lacustrine mud. Restricted by the differential activity of boundary faults, the sedimentary system shows obvious zoning-the nearshore subaqueous fan-fan delta system is developed in the steep slope zone, the gentle slope zone is the fan delta front deposit, and the center of the sag accumulates semi-deep lake-deep lake mudstone and clamps turbidite sand body. Comprehensive evaluation shows that underwater distributary channel and interdistributary microfacies are the optimal reservoir facies belts in the study area. The above results can lay a geological foundation for fine reservoir prediction and remaining oil potential tapping in Block A.
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