Seismic Sedimentology Characterization of Fan-delta in Slope Belt of Eastern Liaohe Depression

doi:10.11885/j.issn.1674-5086.2021.11.21.01

Abstract

Abstract: Fan delta is an important type of oil and gas reservoir in slope zone of faulted basin. Lithology and sedimentary facies vary laterally. It is difficult to characterize sedimentary facies distribution inter-wells. A typical fan-delta deposition at Tiejianglu Area in the gentle slope zone of the eastern Liaohe Sag is studied. i. Two work are carried on including isochronicity analysis of seismic reflection, and seismic characterization of sedimentary facies with multi-attributes fusion. The study reveals: 1) in fan delta deposition area, there are diachronous seismic events locally and frequency division dip difference analysis can identify significant diachronous seismic reflection; 2) the root mean square amplitude, energy half-time and skew in amplitude attributes contain the information of sandstone development degree and lithologic combination. RGB fusion of the three attributes provides a simple and effective method for seismic characterization of sedimentary facies in sparse-borehole areas; 3) in study area, there developed 3 fan deltas including 2 large fan deltas of north provenance and a small fan delta of southeast provenance. At present, the exploration and development are concentrated on the fan deltas of north provenance. This study provides an effective method for seismic characterization of fan delta sedimentary facies in gentle slope zone, and provides direction and target for further exploration in the study area.

Key words: fan delta, slope belt, eastern Liaohe Sag, seismic sedimentology, multi-seismic attributes fusion

CLC Number:

TE122

HUANG Derong, ZHANG Xianguo, WANG Youjing, CAI Guogang, XIE Baoguo. Seismic Sedimentology Characterization of Fan-delta in Slope Belt of Eastern Liaohe Depression[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(3): 14-28.

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