Relationships among volcanic and hydrothermal activity and faults from the Shunnan 3-D well zone in the Tadong Area (Tar
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ORIGINAL PAPER
Relationships among volcanic and hydrothermal activity and faults from the Shunnan 3-D well zone in the Tadong Area (Tarim Basin, China) Li KunBai 1 & Lv HaiTao 2 & Pu RenHai 1 & Cao ZiCheng 2
Received: 13 March 2016 / Accepted: 19 September 2016 # Saudi Society for Geosciences 2016
Abstract Tarim Basin distributed widely two stages of Permian volcanic rocks. However, the location and timing of these rocks pinching out and the relationship between Ordovician carbonate hydrothermal reservoirs and fault activity remain unclear. The Shunnan (Shunnan here in after referred to as SN) 1 3-D well zone in the eastern Tarim Basin contains volcanic rocks, and the Ordovician layer contains a hydrothermal reservoir. This paper describes the lithology, stage, volcanic rock distribution, crater position and deposition pinch-out line of volcanic rocks based on drilling and 3-D seismic data. The Permian strata in the well zone contain only one stage o f K u p k u c i m a n F o r m a t i o n b a s a l t a n d t u ff , t h e Kaipeleicike Formation contains terrigenous clastic rock and the adjacent volcanic rocks of wells SN2 and GL (Gulong here in after referred to as GL) 2 exhibit an absence of deposition. Although the craters are distributed on both sides of the NNW faults that cross well SN4, their positions are also controlled by the intersection of earlier NEE and NW faults and later NNE faults. Furthermore, the Ordovician strata in the SN1 well zone developed abundant tubular high-amplitude anomalies and tabular high-amplitude anomalies via hydrothermal corrosion, and the anomaly distributions are similar to the positions of the craters, which are controlled by the intersection of multi-group faults and the density of the faults.
* Pu RenHai [email protected]
1
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
2
Northwest Oilfield Branch Company of SINOPEC, Urumqi 830011, China
Keywords Tarim Basin . Volcanic rock pinching . Volcano stage . Crater . Fault . Hydrothermal reservoir
Introduction The Tarim large igneous province (TLIP) in northwestern China was formed in the Early Permian (Fig. 1a). The TLIP includes large volumes of flood basalts and mafic-ultramafic intrusions (Mahoney and Coffin, 1997; Pirajno, 2000; Derek, 2003; Ernst and Buchan, 2003). The formation of the TLIP is related to that of the ~260-Ma Emeishan LIP in southwest China (Chung and Jahn, 1995; Xu et al. 2001; Zhou et al. 2002) and the ~250-Ma Siberian Traps in Russia (Campbell et al. 1992; Arndt et al. 1998; Reichow et al. 2009). Elucidating the process of Permian magmatism is crucial for understanding its relationship with the tectonic evolution and the Ordovician hydrothermal reservoirs of the survey area. The SN 3-D seismic survey is located in the central part of the Tarim Basin at the eastern part of the Tazhong uplift (Fig. 1b). Well SN4 in the survey has produced commercial gas from Ordovician carbonate reservoirs. These hydrothermal reservoirs are related to the
