Stratigraphic Division of Buried-hill and Residual Strata Distribution in Eastern Section of Dongying Depression Southern Slope

doi:10.19657/j.geoscience.1000-8527.2019.04.12

Abstract

Abstract:

The degree of buried-hill exploration is low in the eastern section of the Dongying depression southern slope, as impacted by the complex structure of residual sedimentary sequences and development model. The stratigraphic division of deep sedimentary formations in the study area have been reviewed by means of field lithostratigraphic correlation, paleontological division and unconformity logging integrated stratigraphic division. Based on that, tectonic reconstruction has been applied to evaluate the control of the multiphase structural activities on the erosion of the sedimentary sequences. Distribution characteristics of residual sequences are clarified. The results show that Mesozoic residual sequences in the study area are only distributed in the area north of Wanggu Well 2, whereas the southern Caoqiao-Wangjiagang contains mainly Upper Paleozoic sequences. The compressional Indosinian tectonics and the extensional Yanshanian rifting may have created the NW-trending seesaw-type pattern for the buried-hill residual sequences. Our results offer a theoretical guidance on the complex buried-hill exploration in the Dongying depression.

Key words: southern slope of Dongying depression, Mesozoic-Paleozoic, stratigraphic division, residual sequence distribution

CLC Number:

TE121.3

YANG Huaiyu. Stratigraphic Division of Buried-hill and Residual Strata Distribution in Eastern Section of Dongying Depression Southern Slope[J]. Geoscience, 2019, 33(04): 811-819.

Figures/Tables 8

Fig.1 Paleozoic tectonic map of the eastern Dongying Sag

Table 1 Statistics of paleontological evidence of Mesozoic-Paleozoic sequences in the study area

井号	井段/m	古生物证据	层位归属
王66	2 480~2 580	裸子以逆沟粉属、开通粉属为主,孢子以沉单缝孢属、厚角孢属为主	二叠系
王96	2 510~2 610	三角孢属、桫椤孢属、三缝孢属等	侏罗系
王古101	3 280~3 410	蕨类无环孢子占主导,裸子以科达纲的弗氏粉属为主	石炭系

Fig.2 Stratigraphic cross-section comparison of the upper Paleozoic sequences in the southern Wangjiagang area

Fig.3 Seismic reflection characteristics of Paleozoic top surface (Tg) in the Wangjiagang area

Fig.4 Stratigraphic division of the Mesozoic-Paleozoic sequence in the wells Wang 96 and Wanggu 2

Fig.5 Cross section of the NE-trending sequence in the study area

Fig.6 Tectonic evolution of Wanggu 1 buried hill in the Wangjiagang area

Fig.7 Distribution of the Upper Paleozoic residual sequences in the study area

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