Sedimentary Characteristics of Subaqueous Fan in a Faulted Lacustrine Basin:A Case of Typical Blocks in the Downthrown Block of the Southern Dagang Fault

doi:10.19657/j.geoscience.1000-8527.2018.04.18

Abstract

Abstract:

Lithology of downthrown block of the southern Dagang fault consists of conglomerate, sandstone, siltstone and mudstone of the 3^rd member of Shahejie Formation. Sedimentary structures include massive structure, cross bedding, soft sediment deformation and some special features, with the presence of charcoal, plant stem, syndepositional faults and argillaceous sandstone clasts. The grain-size cumulate probability curves can be grouped into one-segment and two-segment type. Besides, four types of well-logging-curve patterns, including box-shaped, bell-shaped,funnel-shaped and straight, were indentified. Reflective characteristics of subaqueous fan can be identified in seismic profile. Depending on grain size, electrical and seismic reflections,we concluded that the southern Dagang structure belt has developed subaqueous fans, which can be subdivided into the inner-fan main channel, middle-fan distributary channel, middle-fan inter-distributary bay, the lobe of channel front,subaqueous levee and crevasse. Since the deposition of the 3^rd member of Shahejie Formation, strong activity of the the southern Dagang fault has led to the development of the distal subaqueous fan in the 5^th fault block. Meanwhile, the proximal subaqueous fan existed in the Qinan 9X1 fault block. These two types of subaqueous fans have different sedimentary characteristics in provenance, lithology, electrical property, seismic reflection and morphology. The proximal subaqueous fan is characterized by its fan-shape, paleo-uplift provenance, coarse-grained sediments, box-shaped log curve, strong amplitude and random seismic reflection, and small size and large quantity, while the distal subaqueous fan is featured by its bifurcation shape, delta provenance, fine-graind sediments, bell-shaped log curve, weak amplitude and chaotic seismic reflection, and large size and small quantity.

Key words: southern Dagang structure belt, the 3^rd member of Shahejie Formation, distal subaqueous fan, proximal subaqueous fan, sedimentary characteristics

CLC Number:

TE121.3

LIU Sheng, LI Shengli, CHENG Tao, ZHOU Xinmao, CAO Rui, ZHANG Qiao, GONG Qiang. Sedimentary Characteristics of Subaqueous Fan in a Faulted Lacustrine Basin:A Case of Typical Blocks in the Downthrown Block of the Southern Dagang Fault[J]. Geoscience, 2018, 32(04): 819-831.

Figures/Tables 12

Fig.1 Tectonic subdivision map of the study area

Fig.2 Stratigraphic column of well qn5-16

Fig.3 Stratigraphic column of well q123

Fig.4 Photos of the typical core features of 5th fault block and Qinan 9X1 fault block

Fig.5 Ternary classification diagram of sandstones in typical wells

Fig.6 Grain-size cumulative probability curve of typical block

Fig.7 Electrofacies pattern of subaqueous fan

Fig.8 Typical seismic reflection characteristics of subaqueous fans

Fig.9 Well correlation sedimentary micofacies in 5th fault block and Qinan 9X1 block

Fig.10 Sedimentary pattern of 5th fault block

Fig.11 Sedimentary pattern of Qinan 9X1 fault block

Table 1 Difference between distal-and proximal-subaqueous fans

水下扇类型	物源	粒度	电性	地震	形态
近源水下扇	古潜山、古隆起	较粗	SP钟形、GR指形、齿化严重	杂乱反射、振幅强	扇形小而多
远源水下扇	三角洲前缘、水下隆起	较细	SP箱形、GR箱型、指形交替	杂乱反射、振幅较弱	朵叶形大而少

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