Accurate structural modeling on the northern section of complex structural belt at Longmenshan piedmont in the Sichuan Basin and its implications for oil and gas exploration

被引：0
|
作者：
Liang H. [1 ]
Xiao F. [1 ]
Ran Q. [1 ]
Guan X. [1 ]
Han S. [1 ]
Chen X. [1 ]
Di G. [1 ]
Xie Z. [1 ]
Liu R. [1 ]
机构：
[1] Exploration and Development Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, 610041, Sichuan
来源：
Natural Gas Industry | 2018年 / 38卷 / 11期
关键词：
Buried structure; Equilibrium section; Exploration area; Fault-related fold; Longmenshan piedmont; Sichuan basin; Structural evolution; Thrust nappe;
D O I：
10.3787/j.issn.1000-0976.2018.11.003
中图分类号：
学科分类号：
摘要：
The northwestern area of the Sichuan Basin has experienced the superimposition of multi-stage thrust nappe deformation and its structural deformation is quite complicated. As a result, the structural mode of the complicated surging zone of Longmenshan piedmont is not figured out and the structural traps in the area are not ascertained. For reducing the risk of oil and gas exploration, accurate structural modeling was carried out based on the fault-related fold theory, combined with latest swath, log, surface and geological data after tectonic movement and surface and geological characteristics were analyzed. Then, the kinematic evolution process of the northern section of the complicated surging zone of Longmenshan piedmont was simulated by using the computer to study the structural geometry, analyze the structural deformation modes and confirm the faulting deformation characteristics and structural traps in this area. Finally, the favorable targets for future oil and gas exploration were presented. And the following research results were obtained. First, separated by Majiaoba fault and No. 1 fault, the northern section of the Longmenshan thrust zone can be sub-divided into three tectonic units, i.e., front nappe belt, surging zone and buried structural belt. Second, fault propagation fold with the occurrence of pitch and inversion is developed at the front tip of No.1 fault in the surging zone and a buried overthrust structure is identified at its lower wall. Third, four sets of vertically stacked Permian-Triassic microlithon are developed in the surging zone, which is structurally deformed in the Indosinian period and activated in the Himalayan period. Fourth, three sets of structural layers are formed in the buried frontal zone by the support of two detachment layers (i.e., the Cambrian shale and the gypsum salt layer of the Jialingjiang Fm, Lower Triassic), and its structural deformation mainly happens in the Himalayan period. In conclusion, the buried Upper Paleozoic structure (middle structural layer) at the lower wall of No.1 fault and Hongxing anticline at the upper wall are morphologically complete, so they are the favorable target areas for the future oil and gas exploration. In addition, the computer based kinematic evolution technology and the accurate structure modeling provide an important technological support for the oil and gas exploration in complex structural belts. © 2018, Natural Gas Industry Journal Agency. All right reserved.
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页码：26 / 32
页数：6
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