Comprehensive Dissection of Meandering-River Sedimentary System in Qinhuangdao 32-6 Oilfield, Bohai Bay Basin

Abstract

Abstract: Because the lateral oscillation amplitude of a meandering river is large, channel deposits are in stagger arrangement and there are no isochronous surface and stable marker bed in the sedimentary system, which leads to difficulties for sand body tracing. The use of well logging-seismic joint inversion technology can improve the resolution of sand body in point bars. Based on the establishment of lithofacies, logging facies and seismic facies and making full use of the characteristics of cores, high vertical resolution of logging curves and good lateral continuity of seismic signals, the accuracies of vertical classification and lateral correlation for channel units of different periods are improved. Abandoned river channel, point bar, flood plain and crevasse splay are identified accurately by overlapping sand body thickness contours, logging facies and seismic wave impedance slices. Based on the statistics of modern meandering river and outcrop data at home and abroad, the paper establishes relationships among geometrical parameters of point bars, puts forward methods to identify lateral accretion body, accretion surface and accretion bed of point bars and a method for internal architecture study, which provides reliable constraint conditions for accurate geological model establishment.

Key words: Bohai Bay Basin, Qinhuangdao 32-6 oilfield, meandering river sedimentary system, lithofacies, logging facies, seismic facies

MA Pinghua, HUO Mengying, HE Jun, SHAO Xianjie, HUO Chunliang, WU Ning. Comprehensive Dissection of Meandering-River Sedimentary System in Qinhuangdao 32-6 Oilfield, Bohai Bay Basin[J]. Xinjiang Petroleum Geology, 2017, 38(zk(English) ): 45-52.

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