Development and Evolution Characteristics of Strike-slip Faults in Tarim Basin and Its Geological Significance: A Case Study of FⅠ17 Fault in Fuman Oilfield

doi:10.19657/j.geoscience.1000-8527.2023.058

Abstract

Abstract:

The strike-slip fault in the platform Tarim basin has the characteristics of “controlling reservoir, controlling reservoir and controlling wealth”, but because it is developed in ultra-deep layer and its activity intensity is low, the fine analysis and evolution characteristic analysis of the fault is the focus and challenge of the current research.To deepen the fine analysis process of strike-slip fault structure and explore the geological significance of fault activity, we took F_Ⅰ17 fault as a case study.Based on the new high-precision 3D seismic data in the Fuman oilfield, combined with a variety of seismic attributes such as coherence, maximum likelihood and reservoir amplitude change rate, we analyzed the spatial distribution regularity, activity characteristics and evolution process of faults, and the characteristics of fault control and storage in combination with the reservoir development characteristics.Based on the reconstruction of the local structural characteristics of the Precambrian basement, the development mechanism of fault plane strike migration is preliminarily analyzed.The results show that the local F_Ⅰ17 fault plane has changed many times and its strike shifted counterclockwise from south to north.Based on the changing characteristics of the fault strike, the fault can be divided into three segments: North (NE8°), middle (NE33°) and south (NE50°).The fault has the characteristics of vertical delamination defor-mation.According to the fault deformation characteristics, it can be divided into the deep structural deformation layer characterized by vertical strike-slip (below TO₃t), and the shallow structural deformation layer with echelon normal fault (above TO₃t).The fault has the characteristic of “stratified flowering” in the deep structural deformation layer, and several flower-like structures are developed vertically, which are mainly distributed near the bottom of the Upper Cambrian (T∈₃) and the top of the Yijianfang Formation (TO₃t).Three groups of echelon normal faults are developed vertically in the shallow structural layer, which are distributed in TO₃t-TS, TS-TC and TC-TT from bottom to top.The fault evolution is likely multi-stage, and the evolution can be divided into five stages: early Caledonian, middle Caledonian Ⅰ, middle Caledonian Ⅲ, late Caledonian-early Hercynian, and middle-late Hercynian.The Precambrian basement rift structure likely affected the development and connection of the overlying strike-slip faults, resulting in the fault plane offset.

Key words: Tarim Basin, Fuman Oilfield, F_Ⅰ17 fault, multi-stage evolution, strike deflection

CLC Number:

P618.13

LIU Qiang, ZHANG Yintao, CHEN Shi, SONG Xingguo, Li Ting, KANG Pengfei, MA Xiaoping. Development and Evolution Characteristics of Strike-slip Faults in Tarim Basin and Its Geological Significance: A Case Study of F_Ⅰ17 Fault in Fuman Oilfield[J]. Geoscience, 2023, 37(05): 1123-1135.

Figures/Tables 13

Fig.1 Regional structural location of the Fuman Oilfield and the distribution of main faults of Lower Paleozoic in adjacent area (modified after ref.[1])

Fig.2 Stratigraphic framework of the Fuman Oilfield and its adjacent area

Fig.3 Coherence slices of various reflecting interfaces and fault interpretations of FⅠ17 fault in the Fuman Oilfield (Seeing Fig.1 for the profile location)

Fig.4 Length statistics of segments in deep structural deformation layer of FⅠ17 Fault in the Fuman Oilfield

Fig.5 Typical profile of deep structural deformation layer of FⅠ17 fault in the Fuman oilfield (seeing Fig.3 for the profile location)

Fig.6 Deformation amplitudes in deep structural deformation layers of FⅠ17 fault in the Fuman Oilfield

Fig.7 Typical profile of shallow echelon normal fault of FⅠ17 fault in the Fuman Oilfield (seeing Fig.3 for the profile location)

Depth slicing characteristics of FⅠ17 fault in the Fuman Oilfield(a)深度切片的平面位置;(b)(c)深度切片的平面特征

Fig.9 Evolution models of FⅠ17 Fault in the Fuman oilfield

Fig.10 Typical core slices of Ordovician carbonate reservoir in FⅠ17 fault in the Fuman oilfield

Fig.11 Reservoir characteristics of FⅠ17 fault zone in the Fuman Oilfield

Fig.12 Characteristic maps of local Precambrian basement thickness

Fig.13 Fault strike deflection models controlled by local basement structures

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