Identification and Characterization of Middle-Shallow Conglomerates of Sikeshu Area in the Southern Margin of Junggar Basin

doi:10.7657/XJPG20200113

Abstract

Abstract:

The middle-lower assemblage structure in the southern margin of Junggar basin is generally located below the middle-shallow gravel belt, and the conglomerates are characterized by wide and irregular lateral distribution and large variations of vertical velocity, which seriously restrict the fine identification of the targets in the middle-lower assemblage. Therefore, it is very important to figure out the structure and distribution of the gravel belt for accurately identifying the configuration and high point position of the underlying structure. Combining micro-logging and drilling data with seismic sections, the paper analyzes the structural characteristics of middlle-shallow conglomerates, describes the top and bottom interfaces of low-speed and high-speed conglomerate intervals of the Sikeshu area in the southern margin of Junggar basin, and establishes time-depth curves by districts and sections, which can be used to guide the accurate depth-domain mapping of composite structures and the velocity model building of the middle and shallow layers for prestack depth migration. The application result shows that the identification and characterization of the middle-shallow conglomerate of the Sikeshu area in the southern margin of Junggar basin is of great help for the accurate determination of the structural objectives and the imaging quality improvement of the seismic sections, which can also be applied in other similar areas in the southern margin of Junggar basin.

Key words: Junggar basin, Sikeshu area, middle-shallow layer, low-speed conglomerate interval, high-speed conglomerate interval, identi- fication and description, time-depth relation, velocity modelling

CLC Number:

P631.443

FAN Xu, LIU Yiwen, ZHENG Hongming, MA Junyan, YIN Lili. Identification and Characterization of Middle-Shallow Conglomerates of Sikeshu Area in the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 108-113.

Figures/Tables 8

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Table 1

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