Identification of Strike-Slip Faults and Exploration Breakthroughs in the Fuman Area, Tarim Basin

doi:10.19657/j.geoscience.1000-8527.2024.065

Abstract

Abstract:

Strike-slip fault zones well-developed in the Fuman area within the Aman transition zone of the Tarim Basin. These faults significantly impact the reservoir characteristics and hydrocarbon accumulation in the Ordovician carbonate rocks. However, identifying strike-slip faults in the Fuman area remains challenging. Using new 3D seismic data from the Fuman area, this study has identified and characterized primary and secondary strike-slip faults through multiple filtering, coherence analysis, and signal decomposition techniques. Additionally, a quantitative standard for classifying strike-slip faults has been established. Furthermore, the exploration potential of the strike-slip faults has been evaluated using the “three determination” approach. The results show that 70 large-scale strike-slip faults are developed within the Tabei Uplift and Central Uplift belts. Based on their development lengths, activity periods, and intensity, the primary strike-slip faults are classified into Class I (25 faults) and Class II (45 faults). In the Fuman area, 34 major strike-slip faults have been identified. Based on fault characterization and drilling data, the “three determination” method, encompassing the determination of faults system, fracture-cavity boundaries, and reservoir units, is proposed for evaluating resources in the Ordovician carbonate reservoirs. The resources associated with the 70 strike-slip faults include 20×10⁸ t of oil and 1×10¹² m³ of gas, with 11×10⁸ t of oil located specifically in the Fuman area. Based on detailed characterization of the strike-slip faults, three new structural belts with abundant oil and gas resources have been identified and confirmed by wells. The study indicates that strike-slip faults of various scales in the Fuman area hold significant potential for increasing reserves and production. This study not only advances research on strike-slip faults and the exploration of fault-controlled fractured-vuggy carbonate reservoirs in the Tarim Basin platform area but also provide valuable guidance for studying strike-slip faults in other cratons.

Key words: strike-slip fault, fault identification technology, fault classification, three-definition method, Fuman area, Tarim Basin

CLC Number:

ZHANG Yintao, YU Yixin, XIE Zhou, SUN Chong, WANG Xiaopeng, SHEN Biao, DU Qirui. Identification of Strike-Slip Faults and Exploration Breakthroughs in the Fuman Area, Tarim Basin[J]. Geoscience, 2024, 38(06): 1417-1430.

Figures/Tables 14

Fig.1 Main structural features in the Aman transitional zone (a) and adjacent area (b), Central Tarim Basin

Fig.2 Paleozoic stratigraphic column in the Fuman area, Tarim Basin

Fig.3 Multi-filter processing flow (a) and comparison of 3D seismic profiles ((b)-(e)) with low signal-to-noise ratio

Fig.4 Comparison of coherence properties before and after filtering fot the Yijianfang Formation in the Yuke Block

Fig.5 Comparison of curvature properties before and after filtering for the base of the Upper Cambrian in the Yingmai Block

Fig.6 Filtering of seismic data in the Fuyuan Block Area Ⅲ, Tarim Basin

Fig.7 Fault interpretation based on seismic signal decomposition

Fig.8 Detailed identification of the secondary strike-slip faults using the four-step method in Fuyuan Block Area Ⅲ, Tarim Basin

Table 1 Quantitative classification standard for strike-slip faults in the Fuman area

断裂分级	跨一级构造单元数量	活动强度(相干特征)	活动期次	延伸长度(km)
Ⅰ级	平面上延伸2个构造单元以上	相干清晰识别	断穿至寒武系或基底;纵向分层明显,多期活动	100~300
Ⅱ级	平面上延伸2个构造单元以下	相干明显异常	断穿至寒武系或基底;纵向有分层性,两期活动	30~100
Ⅲ级	一级构造单元内	相干难以识别,曲率、AFE等属性有异常	断穿至寒武系或基底;分层特征不显著	10~30
Ⅳ级	二级构造单元内	结合振幅变化属性刻画	层间断层和Ⅰ、Ⅱ、Ⅲ级断裂伴生	2~10

Fig.9 Distribution of Class Ⅰ and Ⅱ strike-slip faults in the Upper Ordovician of the Tabei and Central uplifts, Central Tarim Basin

Fig.10 Resource evaluation of Ordovician carbonate reservoirs using the “three-definition” method in the Fuman area

Fig.11 Seismic profile and well logging evaluation of reservoir parameters in the Manshen-8 well

Fig.12 Seismic profile and reservoir parameters of the Yuke-7 well

Fig.13 Seismic profile and reservoir parameters of the Fuyuan-6 well

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