辽河西部凹陷杜84块兴隆台Ⅰ油层隔夹层识别、成因及分布特征

doi:10.11743/ogg20170205

Abstract

Abstract: Barriers/baffles in reservoirs have been considered as one of the control factors of reservoir heterogeneity.A study on barriers/baffles may provide a sound foundation for a fine characterization of reservoirs and a more accurate prediction of remaining oil distribution.By combining core observation and dynamic production data as well as logging data of 1 735 wells in the Shuyi Block in western Liaohe depression,we drew cross plots of five parameter (i.e.interval transit time,lateral resistivity,induction conductivity,porosity and permeability) in accordance with core calibrated logging curves,and analysis result of electrical and physical property tests.We classified the barriers/baffles into two types (shaly barriers/baffles and physical barriers/baffles) and established a standard and a template for their quantitatively identification.The barriers/baffles developed in the study area were mainly controlled by factors including sedimentation of flooding stage,weakening local hydrodynamics,multi-stage fluvial erosion cuttings,progradation and riverbed lag deposition.The shally barriers/baffles were mainly distributed in shallow lakes and interdistributary bays,while the physical barriers/baffles were mostly located in bifurcations of underwater channels and local areas of interdistributary bays.Barriers/baffles were scarce and isolated in the stacked channels near provenance.However,they were more frequent and thicker away from provenance.Their vertical distribution was closely related with the base level cycles and their number and thickness got larger from bottom up in the ascending semi-cycles of the middle-long term base level cycles.We also proposed that the lithology,physical properties,thickness and distribution of barriers/baffles had certain effects upon the performance of SAGD (steam-assisted gravity drainage) in heavy oil discovery of Liaohe Oilfield.

Key words: barrier/baffle, high-resolution sequence stratigraphy, Xing-Ⅰ oil layer, Shahejie Formation, Block Du 84, western Liaohe Depression

CLC Number:

TE122.2

Wu Jun, Fan Tailiang, Gao Zhiqian, Li Chen, Zhang Tao, Ma Congming. Identification, origin and distributions of barriers/baffles Xing-Ⅰ oil layer in Block Du-84 of the western Liaohe Depression[J]. Oil & Gas Geology, 2017, 38(2): 248-258.

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Identification, origin and distributions of barriers/baffles Xing-Ⅰ oil layer in Block Du-84 of the western Liaohe Depression

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