Research on Seismic and Sedimentary Facies in the Sha-3 Member of the Xingma Area

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Science & Technology Review ›› 2010, Vol. 28 ›› Issue (19) : 26-29.

Articles

Research on Seismic and Sedimentary Facies in the Sha-3 Member of the Xingma Area

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Abstract

Gravity flow deposits of the Sha-3 Member in the Xingma area are characterized by strong heterogeneity and rapid lateral facies changes. As a result, it is very difficult to undertake reservoir prediction. In order to solve these problems, sequence stratigraphic analysis and seismic waveform classification techniques for seismic facies are employed in this study. Based on characteristics of sedimentary and seismic reflection, the relationship between reservoir characteristics and seismic waveforms is studied and a reasonable spatial distribution of multiple stages of reservoir sandstones is well predicted. These results show that the entire Sha-3 Member in the study area can be divided into three sequences, and each sequence constitutes one fining-upward sedimentary cycle. The gravity flow deposits show characteristics of quasi-continuous reflection, moderate amplitude and mid-low frequency in seismic sections. In plan view, results can be divided into 10 seismic facies and three seismic facies domains that correspond to middle fan braided channel facies, middle fan-front facies and outer fan-lacustrine facies. By comparison, sequence SQ3 and the southern part of sequence SQ2 are evaluated as the most favorable exploration targets.