Characteristics of Sand Body Dispersion System in Shallow-Water Delta Controlled by Base-Level Cycle

doi:10.7657/XJPG20230603

Abstract

Abstract:

Shallow-water delta reservoirs are developed in the Songliao basin, where the difficulties in reservoir prediction are restricting oil and gas exploration and development. Adhering to the idea of geology-seismology integration and based on high-resolution seismic survey and high-precision sequence stratigraphy, the Yaojia formation in the Xingxi area of the Songliao basin was investigated with respect to sequence stratigraphy, geophysical responses of reservoirs, and spatio-temporal evolution of sand body dispersion system by using the techniques such as 90° seismic phase conversion, forward modeling, and seismic attribute analysis, and the impact of base-level changes on the distribution of dispersion system was discussed. The results indicate that the Yaojia formation in the Xingxi area can be divided into two mid-term base-level cycles, with three identified lithological combinations. On seismic sections, the lithological combination of moderately-thick sandstones intercalated with thin mudstones corresponds to strong amplitudes; the lithological combination of composite thick interbeds corresponds to medium-strong amplitudes; and the lithological combination of thin interbeds corresponds to weak-medium amplitudes. In plane, the sand body dispersion system in the shallow-water delta primarily exhibited a lobe shape in the early stage of base-level rise, gradually transited into a retrogressive dendritic shallow-water delta in the middle-late stage of base-level rise, existed predominantly as progradational-weakly aggradational dendritic shallow-water deltas in the early stage of base-level fall, and appeared as lump-like deposits in the middle-late stage of base-level fall.

Key words: Songliao basin, Xingxi area, shallow-water delta, sand body dispersion system, base-level cycle, forward modeling, lithologi- cal combination

CLC Number:

TE112.221

ZHAO Chunchen, LIU Hao. Characteristics of Sand Body Dispersion System in Shallow-Water Delta Controlled by Base-Level Cycle[J]. Xinjiang Petroleum Geology, 2023, 44(6): 657-666.

Figures/Tables 9

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Table 1.

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