Sandbody Type and Distribution Characteristics of Shallow-Water Delta in Shaximiao Formation, Xinchang Gas Field, West Sichuan

doi:10.19657/j.geoscience.1000-8527.2019.06.03

Abstract

Abstract:

Reservoir heterogeneity is commonly determined by sandbody type and distribution characteristics. Sandbody sedimentary processes can be reflected by vertical sequences, while its spatial distribution can be described by comprehensive logging and seismic survey. In shallow-water delta plain of the Shaximiao Formation, trunk distributary channel (vertical accretion), secondary channel (lateral accretion/aggradation) and the overbank sandbody are developed. Proximal distributary channel (lateral accretion), distal distributary channel (aggradation), estuary bar (progradation) and the sheet sand are developed in the deltaic front. Trunk channels in the delta plain are commonly thicker than 10 m and 600 to 1,800 m wide. The sandbodies can be vertically stacked and laterally stacked in an equal horizontal level, exhibiting a blanket-shaped distribution. Secondary channel sandbodies are mostly located at the lateral edge of the channel and distributed sporadically due to the cutting, with an average thickness of 7.5 m and poor physical properties. Proximal distributary channels are 4 to 8 m thick and 500 to 1,200 m wide. The sandbodies are vertically stacked (misplaced) and laterally stacked in an unequal horizontal level, exhibiting a belt-shaped distribution. Distal distributary channel is 2.5 to 6 m thick and 200 to 700 m wide, exhibiting a shoelace-shaped or isolated distribution pattern. Estuary bar is less developed and often overprinted by channels. Reservoir heterogeneity in the delta plain lies in its physical property difference of two different types of channel sandbodies, while in the deltaic front lies in the labyrinth distribution of sandbody of different origins.

Key words: shallow-water delta, sandbody type, sandbody distribution, Shaximiao Formation, Xinchang gas field

CLC Number:

TE121.3

GAO Yang, HU Xiangyang, ZENG Daqian, ZHAO Xiangyuan, JIA Ying, YU Qingyan, WANG Yongfei. Sandbody Type and Distribution Characteristics of Shallow-Water Delta in Shaximiao Formation, Xinchang Gas Field, West Sichuan[J]. Geoscience, 2019, 33(06): 1163-1173.

Figures/Tables 14

Fig.1 Location of the study area and stratigraphic columns

Fig.2 Typical sedimentary features in the drill cores of Shaximiao Formation

Fig.3 Seismic reflection characteristics of Shaximiao Formation

Fig.4 Typical sedimentary characteristics of sandbodies in shallow-water delta plain of Shaximiao Formation

Fig.5 Typical sedimentary characteristics of sandbodies in shallow-water deltaic front of Shaximiao Formation

Fig.6 Seismic RMS amplitude attribute (A) and planar distribution pattern (B) of sandbodies in shallow-water delta plain (J2s24)

Fig.7 Profile distribution characteristics of sandbodies in shallow-water delta plain(J2s24)

Fig.8 Seismic RMS amplitude attribute (A) and planar distribution characteristics (B) of sandbodies in shallow-water deltaic front (J2s31-3)

Fig.9 Profile distribution characteristics of sandbodies in the inner part of shallow-water deltaic front

Fig.10 Seismic RMS amplitude attribute (A) and planar distribution characteristics (B) of sandbodies in the outer part of shallow-water deltaic front (J2s31-2-1)

Fig.11 Profile distribution characteristics of sandbodies in the outer part of shallow-water deltaic front

Fig.12 Distribution and superimposing patterns of sandbodies in shallow-water delta of Shaximiao Formation

Fig.13 Reservoir physical property of different sandbodies in shallow-water delta of Shaximiao Formation

Fig.14 Pressure variation characteristics of two adjacent production wells in J2s24

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