Deformation Characteristics of Ultra-deep Glide Faults in the Halahatang Area and Their Petroleum Geological Significance

doi:10.19657/j.geoscience.1000-8527.2022.064

Abstract

Abstract:

Strike-slip faults in the Halahatang area control the development of carbonate reservoir and oil-gas enrichment. Influenced by multistage tectonic activities and stratigraphic lithological differences, the spatial structure of strike-slip faults in Halahatang area is diverse and the fault evolution is complex. The control mechanism of structural differences of strike-slip faults on oil and gas enrichment is still controversial. Based on the integrated research of high-precision three-dimensional seismic data and drilling data, the plan deformation pattern and layered and segmented model of strike-slip faults at Halahatang are established in this study. By analyzing the single-well productivity of oil and gas under the control of strike-slip faults, the controlling effect of structural deformation difference of strike-slip faults on oil and gas enrichment is elucidated. The results show that: ①Local strike-slip faults are featured by planar segmentation. The intersection of fault zones leads to the complex spatial fault structure and forms various combination styles. A single fault zone can be divided into three segments: tail, main displacement and overlapping zones, as well as the cutting parts between faults. There are nine plane styles, including feather, horsetail and goose split styles of the tail, and the linear and branching styles of the main displacement zone, The braided and soft-connection types are developed at the overlapping part of the faults, and the intersection and termination types at the cutting part. The deformation characteristics of strike-slip faults are conformable to the Riedel shear model and branch faults are developed around the main faults. The fault development is mainly connected growth, and the cutting part is accompanied by the regulatory deformation caused by successive fault sliding; ②Vertical layering deformation of strike-slip faults controlled the oil-gas migration and accumulation. Fault penetrating across the gypsum layer is the key to the oil and gas ascent. The transformation of Ordovician carbonate rocks controlled the reservoir scale and oil-gas connectivity. Tectonic activities in Silurian clastic rocks influenced the oil-gas filling and preservation; ③The oil-gas enrichment patterns at Halahatang is controlled by the fault pattern. The high-yield wells are mainly distributed in the horsetail and feather trunk branch intersection at the fault zone tail, the braided structural high of the overlapping section, and junctions of the main faults. The prediction results have been verified by ultra-deep wells with remarkable coincidence, and would have guiding significance for the deployment of ultra-deep wells.

Key words: Tarim Basin, strike-slip fault, construction style, delamination deformation, oil and gas enrichment

CLC Number:

P642
TE121.2

ZUO Liang, NENG Yuan, HUANG Shaoyin, LUO Caiming, CHEN Shi, ZHU Tie, WANG Chuan, LU Chengmei. Deformation Characteristics of Ultra-deep Glide Faults in the Halahatang Area and Their Petroleum Geological Significance[J]. Geoscience, 2023, 37(02): 270-282.

Figures/Tables 10

Fig.1 Distribution of major Paleozoic faults in the Halahatang and its adjacent areas(modified from ref.[33])

Fig.2 Typical seismic profiles of the Halahatang area

Fig.3 Stratigraphic division and fault profile characteristics of the Halahatang area

Fig.4 Fracture layered deformation patterns in the Halahatang area

Fig.5 Characteristics of the strike-slip fault plane in the Halahatang area

Fig.6 Strike-slip fault segmental pattern in the Halahatang area(modified from ref.[31])

Fig.7 Characteristics of activity and segmental profile of HA601 strike-slip fault in the Halahatang area

Fig.8 Classification of the activity period of strike-slip faults in the Halahatang area

Fig.9 Classification map of strike-slip fault reservoirs in the Halahatang area

Fig.10 Typical hydrocarbon accumulation profile for a strike-slip fault in the Halahatang area

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