Quantitative Study on the Uppermost Mesozoic Fault Damage Zones in Northern Bozhong Sag

doi:10.19657/j.geoscience.1000-8527.2022.202

Abstract

Abstract:

The Bozhong sag is the largest hydrocarbon-generating sag in the Bohai Sea, and the buried hill belt in the northern part of the sag is an important exploration target. The local Mesozoic geology is mainly dominated by igneous rocks, and fractures are important to the formation of igneous reservoirs. Here, we quantified the fault damage zones by using the seismic variance attribute value, established the quantitative relationship between the width and the fault slant distance, and established a contour map of the variance attribute value. Combined with published chart and thin section data, the fault damage zones at the uppermost Mesozoic sequence in the northern Bozhong sag are quantified, verified and analyzed. The results show that the local faults have multiple fault cores, and that the fault systems are complex. The width of the fault damage zones varies from several hundred meters to several kilometers. The fault damage zones have obvious influence on the Mesozoic volcanic rocks, and the degree of influence correlates negatively with the distance from the fault. The quantitative results of fault damage zones based on seismic variance attribute value is in good agreement with the layout pattern of related research and the thin section analysis results in the study area, which demonstrate high feasibility for the quantitative study of fault damage zones.

Key words: northern Bozhong sag, Mesozoic igneous rock, buried hill, fault damage zones, seismic attributes

CLC Number:

TE121.2

CHEN Yuhang, ZHANG Xintao, YU Yixin, YANG Fan, LIU Yongjun, ZHANG Zhen, DING Kang. Quantitative Study on the Uppermost Mesozoic Fault Damage Zones in Northern Bozhong Sag[J]. Geoscience, 2022, 36(04): 1035-1042.

Figures/Tables 11

Fig.1 Schematic diagrams of fault damage zones

Fig.2 Fault distribution map and typical seismic profile in the study area

Fig.3 Schematic diagrams of quantitative method for fault damage zones

Fig.4 Diagrams of fault distribution and variance attribute of Mesozoic top surface in northern Bozhong sag

Table 1 Data of fault distance and width of fault damage zones of different survey lines in study area

测线号	断距/ km	断层破碎带宽度/km	测线号	断距/ km	断层破碎带宽度/km
xline3079	0.88	0.65	inline5061	0.89	0.90
xline3070	0.85	0.65	inline5071	0.90	1.14
xline3059	0.81	0.85	inline5259	1.11	1.41
inline5451	1.44	1.98	inline5249	1.11	1.20
inline5471	1.46	2.20	inline5239	1.12	1.28
inline5411	1.47	2.40	inline5228	1.17	1.19
inline5051	0.90	0.79

Fig.5 Distribution characteristics of seismic variance attribute value of different survey lines

Fig.6 Coupling curve of quantitative relationship between fault displacement and fault damage zones width

Fig.7 Plane distribution of uppermost Mesozoic fault damage zones in northern Bozhong sag

Fig.8 Variation of fault displacement and fault damage zones width

Fig.9 Mesozoic fracture development characteristics in the northernBozhong sag

Fig.10 Contour map of variance attribute value of the uppermost Mesozoic surface in the northern Bozhong sag

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