Paleogeomorphology of Mixed Rock Deposition in KL16 Oilfield

Abstract

KL16 (Kenli 16) oilfield is located in Bohai Sea, close to Laizhou Bay depression, with favorable reservoir forming conditions. The lower member of Shahejie Formation (lower sub member of the third member of Shahejie formation) has shallow burial, complex structural sedimentary evolution, diverse reservoir lithology types, and unclear reservoir distribution laws, which restrict the exploration and development process. Comprehensive use of core, seismic, logging and analytical laboratory data, through the combination of structural recovery and stratigraphic recovery, the micro paleogeomorphology of the lower member of Shahejie Formation in the sedimentary period is finely restored, and the sedimentary system and sedimentary model in the study area are defined. The study shows that during the sedimentary period of the lower member of Shahejie formation, four geomorphic units were developed in the study area: uplift, slope, platform and depression; Under the control of paleogeomorphology, three different sedimentary environments are developed: Braided River Delta is developed in the west, shore shallow lake mixed beach bar is developed in the middle, and fan delta is developed in the south. Based on the analysis of regional geology and sedimentary characteristics, the principal component coupling technology based on the constraint of sedimentary facies belt is optimized for reservoir distribution prediction, and the application effect is good.