Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (1): 146-161.doi: 10.12108/yxyqc.20260113

• PETROLEUM EXPLORATION • Previous Articles    

Paleogeomorphologic characteristics and sand control mechanisms of Cretaceous Shahezi Formation in Lishu fault depression, southern Songliao Basin

XIAO Meng1(), ZHOU Yong2,3(), WANG Ke2,3, YAN Jingchi2,3, ZHANG Yuejie2,3   

  1. 1 China Petroleum & Chemical Corporation Northeast Oil & Gas Branch, Changchun 130062, China
    2 College of Geosciences， China University of Petroleum (Beijing), Beijing 102249, China
    3 State Key laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
  • Received:2025-04-15 Revised:2025-05-18 Online:2026-01-01 Published:2026-01-23
  • Contact: ZHOU Yong E-mail:271660443@qq.com;zhouyong@cup.edu.cn

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Abstract:

By comprehensively utilizing well logging and seismic interpretation data, activity characteristics of Cretaceous Shahezi Formation synsedimentary faults in Lishu fault depression of southern Songliao Basin were analyzed. The paleogeomorphology was reconstructed based on the impression method, and the controlling role of paleogeomorphology on sedimentary systems were explored. The results show that: （1） The fault activity rate during the deposition of Member 2 of Cretaceous Shahezi Formation in Lishu fault depression was generally higher than that during the deposition of Member 1, showing a trend of first increasing and then decreasing towards the north. （2） During the depositional period of Shahezi Formation, the steep slope zone of Lishu fault depression primarily developed nearshore subaqueous fan and deep-lacustrine sedimentary systems, while the gentle slope zone mainly developed fan delta and shallow-lacustrine sedimentary systems. （3） The paleogeomorphology of the study area controls the distribution of sedimentary facies and sand bodies. Four paleogeomorphic types,such as valleys,transverse uplifts (subaqueous uplifts), strike slopes, and structural slope-break zones,have been identified,all of them exert significant control on sand bodies distribution. Valleys can serve as sand transport pathways, controlling the progression of sand bodies from source areas to depositional areas, and also acting as depositional unloading units. Transverse uplifts developed along the edges of steep slope scarps promote the fan-shaped dispersal of sand bodies into the basin. Strike slopes control the lateral extension of sand bodies, and activity at the terminations of synsedimentary faults governs the pathways of sand diffusion from source areas into the basin. Structural slope-break zones control the transport, migration, and enrichment locations of sand bodies within the basin, which are favorable zones for exploring sandstone oil and gas reservoirs. （4） The depositional period of Shahezi Formation in the study area exhibited a paleogeomorphy sand control model of“multi-source supply—fault-controlled channels—paleogeomorphic sand accumulation”.

Key words: paleogeomorphology, nearshore subaqueous fan, fan delta, fault activity, sand control mechanism, Shahezi Formation, Cretaceous, Lishu fault depression, Songliao Basin

CLC Number: 

  • TE121

Fig. 1

Tectonic unit division of Lishu fault depression （a） and comprehensive stratigraphic column of Cretaceous （b） of Songliao Basin"

Fig. 2

Balanced geological section of NW—NE trending structure in Lishu fault depression"

Fig. 3

Activity of main depression-controlling faults in Cretaceous Shahezi Formation of Lishu fault depression"

Fig. 4

Contemporary stratigraphic thickness of Member 1 (a) and Member 2 (b) of Shahezi Formation of Cretaceous in Lishu fault depression"

Fig. 5

Porosity-depth relationship of Member 2 of Cretaceous Shahezi Formation in Lishu fault depression"

Table 1

Sandstone-mudstone compaction restoration data of Member 2 of Cretaceous Shahezi Formation in Lishu fault depression"

Fig. 6

Thickness restoration before compaction of Member 1 （a） and Member 2 （b） of Cretaceous Shahezi Formation in various areas in Lishu fault depression"

Fig. 7

Thickness restoration before compaction of Member 1 （a） and Member 2 （b） of Cretaceous Shahezi Formation in Lishu fault depression"

Fig. 8

Denudation thickness restored using the stratigraphic trend method of Member 2 of Cretaceous Shahezi Formation in Lishu fault depression"

Fig. 9

Paleogeomorphologic characteristics of sedimentary period of Member 1 (a) and Member 2 (b) of Cretaceous Shahezi Formation in Lishu fault depression"

Fig. 10

Lithofacies characteristics of typical sedimentary facies of Cretaceous Shahezi Formation in Lishu fault depression"

Fig. 11

Seismic facies features of sedimentary systems of Cretaceous Shahezi Formation in Lishu fault depression"

Fig. 12

Distribution characteristics of sedimentary facies of Member 1 (a) and Member 2 (b) of Cretaceous Shahezi Formation in Lishu fault depression"

Table 2

Paleo-valley and sedimentary body data of Member 2 of Cretaceous Shahezi Formation in the middle segment of Sangshutai and northern slope zone of Lishu fault depression"

沟谷
编号		 汇水单元
面积/km2		 测线 沟谷
类型		 基本参数 沉积物
规模/
km2		 输砂能力
宽度/m 深度/m 宽深比
V1 7.81 a U型 1 730 300 5.77 4.04 中等
b V型 1 620 350 4.63 中等
c V型 2 000 400 5.00 中等
V2 9.03 a U型 1 600 220 7.27 5.79 较强
b W型 3 550 219 16.21 较强
c W型 4 348 503 8.64 较强
V3 6.99 a V型 1 678 590 2.84 3.84 较强
b V型 1 530 640 2.39 较强
c V型 1 700 290 5.86 强
V4 19.14 a V型 2 964 1 270 2.33 6.29 较强
b U型 2 900 1 100 2.63 较强
c V型 1 500 592 2.53 较强
V5 2.54 a U型 1 800 490 3.67 1.27 强
b U型 1 600 350 4.57 较强
c U型 1 550 280 5.54 强
V6 — d 断槽型 1 340 390 3.44 — 较强
V7 — d 断槽型 880 450 1.96 — 中等
V8 — d 断槽型 903 404 2.24 — 中等

Fig. 13

Evolution characteristics of Cretaceous Shahezi Formation valleys in western side of Sangshutai fault in Lishu fault depression"

Fig. 14

Development models and seismic profiles of transverse uplifts in Cretaceous Shahezi Formation in Lishu fault depression"

Fig. 15

Development models and seismic profiles of strike slopes in Cretaceous Shahezi Formation of Lishu fault depression"

Fig. 16

Sedimentary filling models of structural slope-break zones in Cretaceous Shahezi Formation of Lishu fault depression"

Fig. 17

Paleogeomorphology sand control models of Member 2 of Cretaceous Shahezi Formation in Lishu fault depression"

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