巴布亚新几内亚奥雷褶皱冲断带构造几何学与运动学特征

王德良; 梅廉夫

doi:10.19509/j.cnki.dzkq.2021.0507

巴布亚新几内亚奥雷褶皱冲断带构造几何学与运动学特征

doi: 10.19509/j.cnki.dzkq.2021.0507

王德良^1,,
梅廉夫^2, ,

基金项目:

黄冈师范学院博士基金项目 2042020032

详细信息

作者简介:
王德良(1991-), 男, 讲师, 主要从事含油气盆地构造分析。E-mail: wdlcug@163.com

通讯作者:
梅廉夫(1961-), 男, 教授, 博士生导师, 主要从事含油气盆地构造分析方面的教学与科研工作。E-mail: lfmei@cug.edu.cn

中图分类号: P542
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-08

Geometry and kinematics of the Aure fold-thrust belt, Papua New Guinea

Wang Deliang^1
,,
Mei Lianfu^{2
, ,}

摘要

摘要: 奥雷褶皱冲断带是巴布亚新几内亚油气勘探的重要区域，但对褶皱冲断带的构造变形样式与演化认识不清。利用覆盖全区的2D和3D地震资料、钻井和地质信息，结合前人在该地区的地质研究成果，以断层相关褶皱理论为指导，对地震资料进行了闭合解释，系统分析了该区褶皱冲断带的构造几何学与运动学特征。研究结果表明：奥雷褶皱冲断带沿走向可以分为东段、中段和西段3段，其构造变形具有明显的差异性：①沿倾向从NE向SW具有变形层次渐浅、卷入层系渐新、变形程度渐弱的变化特征；②沿走向从NW向SE表现为扩展范围渐小、前陆沉积层系渐新、构造变形时间渐晚、缩短率渐大、缩短量渐小的特征；③西段和中段垂向上分层解体，东段为继承性变形。本次研究将助力巴布亚新几内亚的油气勘探，并为澳大利亚北缘区域构造演化研究提供盆内证据。
- 几何学 /
- 运动学 /
- 褶皱冲断带 /
- 前陆盆地 /
- 奥雷 /
- 巴布亚新几内亚
Abstract: The Aure fold-thrust belt is an important area for oil and gas exploration in Papua New Guinea, but the structural deformation and evolution of the fold-thrust belt are not well understood.In this paper, 2D and 3D seismic data, drilling and geological data covering the structural belt, combined with previous geological research results, were used to identify the structure and kinematics characteristics of the Aure fold-thrust belt.Guided by the theory of fault-related folds, the seismic data are interpretation.The Aure fold-thrust belt can be divided into three sections along the strike, and the structural deformation of the belt has obvious differences, which are mainly reflected in the following aspects: ①In the trend from NE to SW, the deformation level is gradually shallow, the involved strata are gradually new, and the deformation degree is gradually weaker; ②Along the strike from NW to SE, the extension range becomes smaller, the foreland sedimentary strata become newer, the tectonic deformation time becomes later, the shortening rate becomes larger, and the shortening amount becomes smaller; ③The western section and the middle section are disintegrated vertically, and the eastern section is inherited deformation.The results can provide basin evidence for oil and gas exploration in Papua New Guinea and regional tectonic evolution in the northern margin of Australia.
- geometry /
- kinematics /
- fold-thrust belt /
- foreland basin /
- Aure /
- Papua New Guinea

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图 1 奥雷褶皱冲断带分带分段图

Figure 1. Regional tectonic setting of the Aure fold-thrust belt

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图 2 B-B′测线地震地质综合解释剖面图(剖面位置见图 1)

Figure 2. Seismic geological comprehensive interpretation section of B-B′ line

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图 3 SB55-14地质构造剖面图(剖面位置见图 1)

Figure 3. Geological structure section of SB55-14

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图 4 F-F′测线地震地质综合解释剖面图(剖面位置见图 1)

Figure 4. Seismic geological comprehensive interpretation section of F-F′ line

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图 5 G-G′测线地震地质综合解释剖面图(剖面位置见图 1)

Figure 5. Seismic geological comprehensive interpretation section of G-G′ line

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图 6 奥雷褶皱冲断带7条测线地震剖面缩短量与缩短率统计图

Figure 6. Comparison of shortening amount and shortening rate of 7 seismic profiles in Aure fold-thrust belt

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图 7 奥雷褶皱冲断带构造变形时序图

Figure 7. Structural deformation sequence diagram of Aure fold-thrust belt

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表 1 奥雷前陆盆地地震资料解释方案对比

Table 1. Comparison of seismic data interpretation schemes in the Aure foreland basin

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表 2 奥雷褶皱冲断带分带分段构造特征对比

Table 2. Comparison of segmented structural characteristics of Aure fold-thrust belt

	分带	分段	构造特征	缩短量	构造分层	滑脱层厚度
基底卷入	叠瓦状基底卷入带	西段	断展褶皱、压性断块	较小	继承性	无
		中段	断展褶皱、压性断块	较小	继承性	无
		东段	断展褶皱、压性断块	较小	继承性	无
盖层滑脱	叠瓦状盖层滑脱带	西段	断展、断弯、叠瓦	较大	上下分层	较厚
		中段	断展、断弯、叠瓦	较大	上下分层	较厚
		东段	断展、断弯、叠瓦	较大	继承性	较薄
	前缘滑脱冲断带	西段	断展、断弯、断滑、叠瓦	较大	上下分层	较厚

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表 3 奥雷褶皱冲断带7条测线地震剖面缩短量与缩短率统计

Table 3. Statistics of shortening amount and shortening rate of 7 seismic profiles in Aure fold-thrust belt

剖面	A-A′	B-B′	C-C′	D-D′	E-E′	F-F′	G-G′
褶皱带长度/km	97.11	72.01	99.78	61.33	9.96	17.76	11.12
原始长度/km	110.72	91.39	110.31	74.30	15.95	26.68	16.63
缩短量/km	13.61	19.38	10.53	12.97	5.99	8.92	5.51
缩短率/%	12.29	21.21	9.55	17.46	37.57	33.44	33.13

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表 4 奥雷褶皱冲断带中段和东段测线地震剖面全层系缩短率统计

Table 4. Statistics of shortening rate of the whole strata in the middle and eastern sections of Aure fold-thrust belt

剖面	剖面长度/km	地层	原始长度/km	缩短量/km	缩短率/%
E-E′	9.96	T0	10.20	0.25	2.41
		T1	10.15	0.19	1.88
		T1″	14.38	4.40	30.76
		T2	15.95	5.99	37.57
		Tg	10.30	0.34	3.34
F-F′	17.76	T0	18.52	0.76	4.11
		T1	16.33
		T1′	20.64	4.01	19.43
		T1″	25.86	8.11	31.34
		T2	26.68	8.92	33.44
		Tg	17.88	0.12	0.67
G-G′	11.12	T0	11.27	0.16	1.37
		T1	11.23	0.11	1.00
		T1′	17.41	6.29	36.15
		T1″	16.63	5.51	33.13
		T2	15.90	4.79	30.09
		T3	11.69	0.57	4.85
		T4	11.56	0.41	3.82
		Tg	11.20	0.09	0.76

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