Characteristics and Identification of Seismic Reflection in Heterogeneous Beach Reservoirs

doi:10.11885/j.issn.1674-5086.2018.01.11.02

Abstract

Abstract: The Longwangmiao Formation Reservoir in the middle of the Sichuan Basin is highly heterogeneous, leading to diversified seismic reflection characteristics. Hence, based on in-depth analyses of actual drilling data and forward modeling, the seismic reflection modes in the Longwangmiao Formation Reservoir are summarized in order to delineate which distribution favors beach reservoirs. Beach reservoir variations in the Longwangmiao Formation are examined based on actual drilling data. It is believed that the main body of the Moxi Reservoir is more developed, and the reservoir in the peripheral areas is generally thinner with higher heterogeneity. There are five seismic reflection modes in the Longwangmiao Formation in the middle Sichuan area. In particular, reflection characteristics such as troughs at upper boundaries, strong internal peaks, and double peaks are characteristics of favorable seismic responses in the Longwangmiao Formation. A beach reservoir can be effectively identified based on the idea that lower reservoir boundaries correspond to highlight crests and that reservoir development influences reflection from the upper boundaries in the Longwangmiao Formation. In particular, contiguous beach reservoirs develop along the main body of the Moxi Reservoir, while northeast-striking banded point beaches develop in the peripheral areas.

Key words: Middle Sichuan Area, Longwangmiao Formation, seismic reflection modes, forward modeling, seismic attribute

CLC Number:

TE122

DAI Ruixue, RAN Qi, GUAN Xu, LIANG Han, LAI Qiang. Characteristics and Identification of Seismic Reflection in Heterogeneous Beach Reservoirs[J]. 西南石油大学学报(自然科学版), 2019, 41(3): 61-70.

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